47 results about "Electromagnetically induced transparency" patented technology

This invention provides a Rydberg-atom based electromagnetic field detector array comprising a plurality of Rydberg-atom based electromagnetic field detectors, wherein each Rydberg-atom based electromagnetic field detector is divided into a plurality of units, each unit of the plurality of units being either: a variable transparency unit configured to vary its transparency by the Electromagnetically Induced Transparency, EIT, effect and further vary its transparency in response to an incident electromagnetic field, or a separator unit, wherein a sequence of one or more variable transparency units and one or more separator units of the plurality of units for a Rydberg-atom based electromagnetic field detector uniquely identifies that Rydberg-atom based electromagnetic field detector in the Rydberg-atom based electromagnetic field detector array.

An atomic object confined in a particular region of an atomic object confinement apparatus is cooled using an S-to-P-to-D EIT cooling operation. A controller associated with the atomic object confinement apparatus controls first and second manipulation sources to respectively provide first and second manipulation signals to the particular region. The first manipulation signal is characterized by a first wavelength corresponding to a transition between an S manifold and a P manifold of a first component of the atomic object and detuned from the S-to-P transition by a first detuning. The second manipulation signal is characterized by a second wavelength corresponding to a transition between the P manifold and a D manifold of the first component and detuned from the P-to-D transition by a second detuning. The first and second detunings selected to establish a dark state associated with a two-photon transition between the S manifold and the D manifold.

An atomic object confined in a particular region of an atomic object confinement apparatus is cooled using an S-to-P-to-D EIT cooling operation. A controller associated with the atomic object confinement apparatus controls first and second manipulation sources to respectively provide first and second manipulation signals to the particular region. The first manipulation signal is characterized by a first wavelength corresponding to a transition between an S manifold and a P manifold of a first component of the atomic object and detuned from the S-to-P transition by a first detuning. The second manipulation signal is characterized by a second wavelength corresponding to a transition between the P manifold and a D manifold of the first component and detuned from the P-to-D transition by a second detuning. The first and second detunings selected to establish a dark state associated with a two-photon transition between the S manifold and the D manifold.

The present application relates to the technical field of quantum precision measurement, in particular to a Roland C signal receiving method and system based on Rydberg atoms, which utilizes atomic antennas to prepare Rydberg atoms in an alkali metal atom gas chamber to obtain an electromagnetically induced transparency (EIT) spectrum; a Roland C signal reaches the alkali metal atom gas chamber through free space, and the EIT spectrum produces an oscillation peak by utilizing the Stark effect of the Rydberg atoms; the coupling laser frequency is locked to the maximum position of the oscillation peak amplitude; by applying a direct current bias voltage to the parallel electrodes built in the alkali metal atom gas chamber, on the one hand, the received Roland C signal is corrected, and on the other hand, the alternating current Stark effect is amplified, so that the receiving sensitivity of the Roland C signal is significantly improved.

This invention discloses a high-quality factor electromagnetically induced transparent resonator device based on a dielectric-metal bilayer metamaterial. The device includes a substrate, dielectric resonator units arranged in a two-dimensional periodic pattern on the upper surface of the substrate, and metal resonator units arranged in a two-dimensional periodic pattern on the lower surface of the substrate. The dielectric and metal resonator units have the same two-dimensional distribution period and arrangement direction. The metal resonator unit is located directly below the dielectric resonator units. The substrate is made of a dielectric material. Each dielectric resonator unit consists of two rectangular dielectric ring pillars with their long sides parallel to each other. The metal resonator unit consists of a rectangular metal strip parallel to the long sides of the two rectangular dielectric ring pillars. This device provides a dielectric-metal bilayer metamaterial-based electromagnetically induced transparent resonator, improving the quality factor of electromagnetically induced transparency and overcoming the shortcomings of existing technologies, such as low quality factors and complex adjustment mechanisms.

The invention discloses an atomic gas chamber device sealed by a metal sheet, a direct current voltage measuring device and a direct current voltage measuring method. The atomic gas chamber device comprises a first outer polar plate, a second outer polar plate, a first tungsten rod, a second tungsten rod, a first glass bead, a second glass bead, a first inner polar plate, a second inner polar plate and an atomic gas chamber, the direct-current voltage measuring equipment comprises a first laser, a dichroscope, a photoelectric detector, a second laser, a controller and an atomic gas chamber device. The direct-current voltage measuring method comprises the following steps: performing frequency locking on first laser output by a first laser and second laser output by a second laser; detecting an electromagnetically induced transparency spectrum by using a photoelectric detector; acquiring a direct-current voltage output by an external voltage source by using an atomic gas chamber device, so that the electromagnetically-induced transparent spectrum is changed; and determining the frequency shift of the first laser transmission peak based on the electromagnetic induction transparent spectrum by using a controller, obtaining the frequency shift amount, and determining the voltage value of the direct-current voltage based on the frequency shift amount.

This invention relates to the field of microwave remote sensing precision calibration technology, and particularly to a traceable microwave radiation calibration device and method based on the quantum coherence effect of Rydberg atoms with a wave-shaped structure. The device includes: a microwave standard radiation system, a dynamic ring track, a Rydberg atom electric field measurement system, a radiometer receiving antenna, a data acquisition and control system, and a data processing system. The device uses the dynamic ring track to move the microwave transmitting antenna, causing microwave electromagnetic signals to alternately irradiate the Rydberg atom electric field measurement system and the radiometer receiving antenna. The interaction between the microwave electric field and specific Rydberg energy levels induces the Euler-Townes effect, causing energy level splitting and resulting in peak position evolution in the electromagnetically induced transparency spectrum of the atomic laser system. The data processing system calculates the electric field intensity and converts it into the corresponding brightness temperature, thereby calibrating the radiometer receiving antenna.

This invention relates to the field of microwave remote sensing precision calibration technology, and particularly to a traceable microwave radiation calibration device and method based on the Rydberg atomic quantum coherence effect. The device includes: a microwave standard radiation system, a parabolic reflector (5), a Rydberg atomic electric field measurement system (1), a radiometer receiving antenna (3), a data acquisition and control system (6), and a data processing system (14). The microwave electromagnetic signal from the microwave transmitting antenna (4) is reflected by the parabolic reflector (5), so that the microwave electromagnetic signal alternately irradiates the Rydberg atomic electric field measurement system (1) and the radiometer receiving antenna (3). The interaction between the microwave electric field and a specific Rydberg energy level causes the Euler-Townes effect energy level splitting, resulting in a peak position evolution of the electromagnetically induced transparency spectrum in the atomic laser system. The data processing system (14) calculates the electric field strength and converts the electric field strength into the corresponding brightness temperature, thereby calibrating the radiometer receiving antenna (3).

The present invention relates to a method and device for measuring the polarization direction of a microwave electric field based on Rydberg atoms. The method includes: generating two sets of orthogonally polarized lasers, where the probe light and coupling light with the same polarization direction are correspondingly combined and transmitted through two sets of optical fibers respectively to excite the atoms in the alkali metal atomic cell from the ground state to the Rydberg state; based on the interaction between the probe light, coupling light and alkali metal atoms, forming the electromagnetically induced transparency (EIT) effect of a three-level system to obtain an EIT signal. Among them, a specified microwave frequency is selected, and the microwave electric field generated by a microwave source is applied to the alkali metal atomic cell to cause the EIT signal to split and obtain an EIT-AT splitting signal; observing the two sets of EIT-AT splitting signals through an oscilloscope, and determining the angular range between the polarization direction of the microwave electric field and the polarization direction of the laser according to the left and right peak value ratios of the splitting peaks of the two sets of splitting signals. The technical solution provided by the present invention can improve the accuracy of microwave electric field measurement.

This invention discloses a magnetic field-excited electromagnetically induced transparency-like device and method. The device includes two opposing FR-4 dielectric substrates and a metal-etched resonant structure fixed to the surface of the FR-4 substrates. The metal resonant structure includes a copper double U-shaped ring resonant structure and a double circular ring resonant structure. Both the double U-shaped ring resonator and the double circular ring resonator are excited by incident electromagnetic waves. The incident electric field direction is symmetrical to the structure, and the incident magnetic field direction is perpendicular to the surface of the dielectric substrate. Both the double U-shaped ring structure and the double circular ring structure are excited by the incident magnetic field, but with different coupling strengths, forming a bright-mode-bright-mode coupling. This invention features a bright-mode-bright-mode channel coupling method with simultaneous magnetic field excitation. By using two resonant structures with different coupling strengths to the electromagnetic field, a two-layer electromagnetically induced transparency-like device with large group time delay and high sensitivity is obtained.

The present invention provides a polarization-based multimode coupling tunable electromagnetically induced transparency-like device, which includes a dielectric plate. The dielectric plate is provided with a double-layer metal resonant structure. The double-layer metal resonant structure includes a circular resonator, an H-shaped resonator, and a split-ring resonator. The top surface of the dielectric plate is provided with the circular resonator and the H-shaped resonator. The H-shaped resonator is arranged inside the circular resonator, and the H-shaped resonator and the circular resonator are in non-contact with each other. The bottom surface of the dielectric plate is provided with the split-ring resonator. By changing the polarization direction of the incident electromagnetic wave, the switching between single-peak and double-peak of the electromagnetically induced transparency-like is realized. This polarization-based multimode coupling tunable electromagnetically induced transparency-like device can realize the switching between single and double transmission windows in the electromagnetically induced transparency-like by changing the polarization direction, and can produce a strong slow light effect accompanied by a large group delay, having potential application value in the field of sensors.

The invention discloses a partial discharge detection method and device based on a Rydberg atomic electric field sensor, belongs to the technical field of partial discharge detection, and solves the problem that the sensor is easily damaged by electrical breakdown in a strong electric field environment in an existing partial discharge detection technology. A ground state cesium atom is excited to a Rydberg state, based on a free space coupling configuration mode, a to-be-measured radio frequency signal is directly propagated into an atomic gas chamber through a free space to be coupled with the Rydberg atom, an atomic energy level is displaced, the transmissivity of an electromagnetically-induced transparent spectrum is changed, electric field information is encoded into an optical signal, and the optical signal is transmitted to the ground state cesium atom. And then the photoelectric detector is used for converting the modulated optical signal into an electric signal, the electric signal is input into the oscilloscope for time domain waveform analysis, and based on an electrical-optical-electric signal conversion mechanism, the common electric breakdown risk in the traditional ultrahigh frequency detection technology is effectively avoided.

The present invention discloses a liquid detection sensor chip based on a dual-band electromagnetically induced transparency effect. The sensor chip includes a metal layer and a base layer. The metal layer comprises a unit structure array composed of an external metal square open resonator and an internal double circular open ring dimer resonator, the unit structure array being arranged in a square periodic pattern. The base layer is used to house the metal square open resonator and the double circular open ring dimer resonator of the metal layer. When a terahertz wave is vertically irradiated onto the sensor chip, the two bright modes excited by the metal structure couple with each other, generating destructive interference and achieving a dual-band wide-window and narrow-window electromagnetically induced transparency effect. The present invention has a simple structure, is easy to process, and has high sensitivity. It has broad application prospects in liquid detection, qualitative drug detection, and early screening of cancer cells.

The invention discloses a polarization-insensitive tunable electromagnetically-induced transparent metamaterial structure, which comprises a dielectric substrate; the metamaterial unit structures are periodically arranged on the dielectric substrate; each metamaterial unit structure comprises a graphene disc located in the center and a graphene hole groove in the periphery, and the graphene hole groove is annular and surrounds the graphene disc; the diameter D1 of the graphene disc and the diameter D2 of the graphene hole groove meet D2gt; d1; the period P of the metamaterial unit structure meets Pgt; d2. According to the invention, dynamic regulation and control of electromagnetically induced transparency are realized. The structure not only enhances the response of the material to electromagnetic waves, but also realizes an all-around EIT-like effect, is insensitive to a polarization state and an incident angle, and provides a new view angle for the practical application of the EIT effect.

The invention provides a thin-film lithium niobate electro-optical modulator and method based on an electromagnetically-like induced transparency effect, and relates to the technical field of optical fiber communication. The thin film lithium niobate electro-optical modulator comprises a thin film lithium niobate substrate; the optical waveguide structure is formed on the thin-film lithium niobate substrate and comprises a direct light waveguide and an annular resonant cavity waveguide which are coupled with each other, and the annular resonant cavity waveguide is configured to be capable of supporting at least one first optical mode and at least one second optical mode which are different in optical mode; the first optical mode and the second optical mode can generate coherent coupling and interference, so that a transmission spectrum of the straight light waveguide forms an electromagnetically-induced transparent transmission peak in the micro-ring resonant cavity and generates high-dispersion optical response; the traveling wave electrode system is arranged on the annular resonant cavity waveguide and is used for applying a modulation electric field to the annular resonant cavity waveguide; and the direct current bias device is connected with the traveling wave electrode system and is used for superposing the direct current bias voltage and the radio frequency modulation voltage and then applying the superposed voltage to the traveling wave electrode system.

This invention provides a method of detecting an electromagnetic field, and a device for 5 performing said method, the method comprising the steps of: transmitting a probe signal at a probe frequency in a first probe signal path and a second probe signal path to an optical receiver, wherein the first probe signal path passes through a transmission medium and the probe frequency is set to excite electrons of the transmission medium from a ground state to a first excited state; transmitting a coupling signal at a coupling frequency in a first coupling signal path, wherein the first coupling signal path overlaps with the first probe signal path in the transmission medium in a first overlapping section, wherein the coupling frequency is set to excite electrons of the transmission medium to a predetermined excited state so as to induce an Electromagnetic Induced Transparency, EIT, effect in the transmission medium such that an incident electromagnetic field at the transmission medium causes a change in refractive index in the transmission medium at the first overlapping section such that there is a change in an optical path length difference between the first probe signal path and the second probe signal path; combining the first path of the probe signal, following its passage of the first overlapping section of the transmission medium, with the second path of the probe signal; and monitoring, at the optical receiver, the intensity of the combined first and second paths of the probe signal so as to detect the incident electromagnetic field at the first overlapping section of the transmission medium as a change in the intensity caused by the change in the optical path length difference between the first probe signal path and the second probe signal path.

The embodiment of the invention belongs to the technical field of radio frequency electromagnetic field measurement, and discloses an atmospheric electrostatic field intensity monitoring method and device, and the method comprises the steps: determining the measurement parameters of Rydberg atoms according to the preset resolution of an atmospheric electrostatic field and the maximum field intensity, and carrying out the electromagnetic induction transparent measurement of the Rydberg atoms; when the field intensity of the atmospheric electrostatic field is not greater than a preset threshold value, determining the field intensity of the atmospheric electrostatic field according to a first stark frequency shift of Rydberg atoms obtained by electromagnetic induction transparency measurement and the polarizability; and when the field intensity of the atmospheric electrostatic field is greater than the preset threshold value, determining the field intensity of the atmospheric electrostatic field according to the dipole moment of the Rydberg atom and a second stark frequency shift of the Rydberg atom obtained by electromagnetic induction transparency measurement. On the basis of nonlinear response spectral measurement of Rydberg atoms, all-optical continuous measurement of the atmospheric electrostatic field is innovatively realized, so that the field intensity of the atmospheric electrostatic field is measured more accurately.

The utility model relates to the field of angle measurement, in particular to a Rydberg atom electromagnetic induction transparency effect angle measuring device. Comprising a mounting plate, a first laser, a first laser beam splitter, an atom steam bubble, a first adjusting assembly, a second laser beam splitter, a third laser beam splitter, a second adjusting assembly, a second laser, a photoelectric detector, a data analysis module and a connecting line. The laser beam splitter is arranged to replace a reflective mirror, the number of optical elements can be reduced, the optical path design is simplified, the whole system is more compact and convenient to install and debug, the first adjusting assembly and the second adjusting assembly are arranged and can be used for adjusting the angles of the atom steam bubble and the laser beam splitter respectively, and the adjustment precision is improved. The measuring device can adapt to the measuring requirements of different angles, the measuring flexibility is improved, the application range is widened, the optical path can be further optimized by adjusting the angle, the measuring error caused by angle deviation is reduced, and therefore the measuring precision is improved.

The present invention discloses a metamaterial for realizing tunable electromagnetic induced transparency in dual polarization channels. By designing a composite metamaterial, tunable electromagnetic induction phenomenon in the near-infrared band in dual polarization channels is achieved. The designed metamaterial includes a base layer at the bottom and periodically spaced dielectric squares and vanadium dioxide squares attached to the upper surface of the substrate. The present invention can achieve tunable electromagnetic induced transparency phenomenon in dual polarization channels in the near-infrared band by selecting the materials of the substrate and the dielectric squares and designing the size parameters between various components. When x-polarized light and y-polarized light are respectively incident on the metamaterial, high-quality electromagnetic induction phenomenon can be achieved in the near-infrared band. In addition, by adjusting the conductivity of vanadium dioxide, flexible regulation of the electromagnetic induced transparency window will be realized. This structure has important application potential in optical switches, slow light devices and high-sensitivity refractive index sensors, and can improve the integration of devices and realize the miniaturization of devices.

The application discloses a method, system and detection device for detecting partial discharge signals by using Rydberg atoms, and the method comprises the following steps: preparing Rydberg atoms in a cesium atom vapor chamber; receiving an optical signal by a photoelectric detector; obtaining an electromagnetically induced transparency spectrum and taking the spectrum as an electromagnetically induced transparency background spectrum; placing a propagation direction of a to-be-detected signal perpendicular to a laser propagation direction in the cesium atom vapor chamber; preparing Rydberg atoms in the cesium atom vapor chamber again; receiving an electromagnetically induced transparency spectrum under the influence of the to-be-detected signal by the photoelectric detector and taking the spectrum as a to-be-detected electromagnetically induced transparency spectrum; comparing the to-be-detected electromagnetically induced transparency spectrum with the electromagnetically induced transparency background spectrum; if a signal peak exists in the spectrum, it is indicated that the to-be-detected signal exists in partial discharge; and if the signal peak does not exist, it is indicated that the to-be-detected signal does not exist in partial discharge.

The present application discloses a field strength measurement device based on the electromagnetically induced transparency (EIT) effect. The device consists of a detection laser, a coupling laser, a beam splitting module and an atomic vapor cell. The beam splitting module is used to obtain a first target detection light and a second target detection light that are collinear and opposite in direction, and a first target coupling light and a second target coupling light that are collinear and opposite in direction. The first target detection light and the first target coupling light are collinear and in the same direction. The first target detection light and the first target coupling light generate the EIT effect in the atomic vapor cell, and the second target detection light and the second target coupling light generate the EIT effect in the atomic vapor cell. The Doppler effect between the first spectral diagram of the first target detection light and the second spectral diagram of the second target detection light is canceled out, and the intersection of the first spectral diagram and the second spectral diagram reflects the magnitude of the field strength. It can be seen that the present application can improve the possibility of the development of field strength measurement based on Rydberg atoms in the power system.

The invention provides a Rydberg atom microwave detection device and method based on a hollow-core optical fiber. The device comprises a pump light laser, a detection light laser, a microwave convergence device, an atom gas chamber and a signal processing module, the atomic gas chamber is a hollow-core anti-resonance optical fiber gas chamber formed based on a hollow-core anti-resonance optical fiber, and the hollow-core anti-resonance optical fiber gas chamber is filled with alkali metal atom steam; the detection light laser emits detection laser to one end of the hollow-core anti-resonance optical fiber gas chamber, and alkali metal atoms in the hollow-core anti-resonance optical fiber gas chamber are excited from a ground state to a first excitation state; the pump light laser emits continuous laser to the other end of the hollow-core anti-resonance optical fiber air chamber, atoms in a first excitation state are excited to a corresponding Rydberg state, and an electromagnetic induction transparent window is formed; and the signal processing module is used for determining the field intensity of the electromagnetic wave to be detected based on the AT splitting peak information of the electromagnetic induction transparent window in the detection laser. According to the invention, the pumping excitation efficiency and detection efficiency of Rydberg atoms are improved.

This invention provides an electromagnetic field detector, a system including the electromagnetic field detector, and a method of operating the electromagnetic field detector. The electromagnetic field detector includes: a first optical signal interface configured to receive a first optical signal from one or more remote light sources; an electromagnetic field transmitter configured to transmit a local oscillator electromagnetic field generated according to the first optical signal, the electromagnetic field transmitter including: a photocurrent generator configured to generate a photocurrent according to the first optical signal; an antenna interface configured to provide the photocurrent to an antenna to transmit the local oscillator electromagnetic field; a second optical signal interface configured to receive a probe optical signal and a coupled optical signal from one or more remote light sources; and a transmission medium. The medium is configured to be excited by a probe optical signal and further excited by a coupling optical signal, wherein the probe optical signal has a probe frequency set to excite electrons in the transmission medium to a first excited state, and the coupling optical signal has a coupling frequency set to excite electrons in the transmission medium to a predetermined Rydberg state to induce an electromagnetically induced transparent (EIT) effect, wherein the transmission medium is further configured to receive a local oscillator electromagnetic field and a phase-modulated electromagnetic field from a remote transmitter, such that the combination of the phase-modulated electromagnetic field and the local oscillator electromagnetic field causes a change in the probe optical signal, and the phase state of the phase-modulated electromagnetic field can be detected according to the change.

The present application relates to a system and method for real-time measurement of microwave polarization direction based on two local microwave electric fields, comprising two lasers, a microwave source and a microwave horn antenna, a Helmholtz coil, a rubidium atomic cell, a motorized rotating stage, a photodetector and a spectrum analyzer, the two lasers generate probe light and coupling light respectively, and the microwave horn antenna radiates microwave to the rubidium atomic cell. The probe light and the coupling light excite the atoms in the rubidium atomic cell to the Rydberg state under the influence of the microwave electric field. By measuring the transmittance change of the probe light with a frequency near the electromagnetically induced transparency resonance frequency, two beat frequency signal amplitudes of different frequencies generated by the two local microwave electric fields and the signal microwave electric field are obtained, and the real-time measurement of the polarization direction of the signal microwave electric field is realized according to the ratio of the two beat frequency signal amplitudes. By measuring the change of the beat frequency signal amplitude before and after applying a magnetic field, the angular resolution of the microwave electric field polarization direction in the range of 0 to 180 degrees is realized.

A method for RF sensing using a quantum sensor includes establishing an operational mode from at least two available operational modes, the two available operational modes where the first excitation mode has a narrower RF signal detection bandwidth. The method further generates, using laser sources having optical excitation parameters for the established operational mode, optical excitation of an atomic species. The method further detects an optical signal from the atomic species corresponding to an optical signal type associated with the established operational mode. The optical signal is elicited in response to an incident RF signal falling within an RF detection bandwidth corresponding to the established operational mode. In this method, the each first operational mode comprises a respective excitation mode and a respective optical signal type being produced in response to electromagnetically-induced transparency associated with the incident RF signal, or in response to an ensemble effect in the atomic species.

An atomic oscillator includes a frequency oscillator configured to output an oscillation signal; a light source configured to output laser light containing first light and second light having frequencies different from each other based on a modulation signal corresponding to the oscillation signal; an atomic cell configured to encapsulate alkali metal atoms; a light reflector including a mirror configured to change a reflection angle of the laser light to cause the laser light reflected off the mirror to enter the atomic cell at a predetermined cycle; a photodetector configured to detect the laser light passing through the atomic cell and output a detection signal corresponding to an intensity of the laser light; anda control circuit configured to control the frequency oscillator based on the detection signal to adjust a frequency of the oscillation signal so that the alkali metal atoms cause an electromagnetically induced transparency phenomenon to occur.

The application discloses a planar chiral broadband cross-polarization electromagnetically induced transparency structure, which comprises periodically arranged planar chiral structure units; the planar chiral structure units are sequentially provided with a first metal layer, a dielectric layer and a second metal layer from top to bottom; the first metal layer is a cut-corner modified L-shaped structure; the second metal layer and the first metal layer form a non-C4 symmetric chiral configuration; the first metal layer and the second metal layer are two-dimensional non-C4 symmetric chiral enantiomers; the first metal layer and the second metal layer are prepared by using the same conductive material and have the same geometric size; the cut-corner modified L-shaped structure is designed by means of an angular asymmetric chamfer, can prolong the oblique current transmission path at the metal node, and can inhibit co-polarization transmission and reflection; the application has the characteristics of ultra-wideband, high polarization conversion efficiency, low profile and easy processing and integration, simultaneously has a slow light effect, and is suitable for the application requirements of 5G / 6G wireless communication.

This invention discloses a terahertz electromagnetically induced transparent modulation device based on liquid crystal material and its application. The modulation device consists of transparent modulation units arranged in an array. From top to bottom, each transparent modulation unit comprises a dielectric substrate, an electromagnetically induced transparent microstructure, a liquid crystal layer, and a silicon backplane. The electromagnetically induced transparent microstructure includes a truncated line and a gold-plated electric field coupling capacitor-inductor resonant structure. A silicon island is introduced into the electric field coupling capacitor-inductor resonant structure to control the propagation of terahertz waves. The liquid crystal layer serves as an active modulation module. This invention achieves logic modulation based on the electromagnetically induced transparency effect through a silicon-gold composite electromagnetically induced transparent microstructure, and achieves modulation of the device's operating frequency band by filling with liquid crystal material. The designed modulation device meets the requirements of wide modulation frequency range, simple structure, and continuous multi-band modulation of terahertz waves, thus broadening the application scope of liquid crystal materials in the field of terahertz wave modulation.

The present invention relates to the field of magnetic field measurement technology, and in particular to a magnetic field measurement method, system, storage medium and electronic equipment. Left-handed circularly polarized light and right-handed circularly polarized light are used to control atomic quantum states and generate quantum interference effects in atomic Zeeman magneton energy levels, namely, electromagnetically induced absorption and electromagnetically induced transparency. The second transmitted light of the left-handed circularly polarized light changes with the angle between the light and the magnetic field direction, thereby measuring the magnitude of the external magnetic field while providing information on its direction. Calculations show that the light transmission peak line width (full width at half maximum) of the electromagnetically induced absorption can reach 0.6 of the Zeeman magneton energy level interval frequency, which also provides extremely high magnetic field measurement sensitivity.