30 results about "Nitrogen-vacancy center" patented technology

A solid-state gyroscope apparatus based on ensembles of negatively charged nitrogen-vacancy (NV⁻) centers in diamond and methods of detection are provided. In one method, rotation of the NV⁻ symmetry axis will induce Berry phase shifts in the NV⁻ electronic ground-state coherences proportional to the solid angle subtended by the symmetry axis. A second method uses a modified Ramsey scheme where Berry phase shifts in the ¹⁴N hyperfine sublevels are employed.

Systems and apparatuses are disclosed for a hydrophone using a nitrogen vacancy center diamond magnetic sensor.

Masers and microwave amplifiers that can function in the continuous-wave mode at room temperature are provided. The maser system can include a diamond gain medium having nitrogen-vacancy centers, and a resonator can be disposed around the gain medium. The resonator can be disposed in a cavity box, and radiation (e.g., visible light) can be provided to the gain medium to cause emission of microwave radiation.

The invention relates to a weak magnetic field measurement technique, in particular, a novel nitrogen-vacancy center diamond scanning magnetometer. With the novel nitrogen-vacancy center diamond scanning magnetometer adopted, the problems of low sensitivity and limited application range of existing weak magnetic field information measuring tools can be solved. The novel nitrogen-vacancy center diamond scanning magnetometer of the nitrogen-vacancy center diamond includes an atomic force microscope system and an optical detection magnetic information system; and the atomic force microscope system includes an ultra-high vacuum chamber, a scanning tube, a nitrogen-vacancy center diamond probe, a 670nm-wavelength laser, a four-quadrant photodiode detector, a phase-locked loop, an automatic gain control loop, piezoelectric ceramic, a 50-ohm resistor, a feedback control loop, a lock-in amplifier, a carrier, a surface topography information output port and a magnetic information output port. The novel nitrogen-vacancy center diamond scanning magnetometer of the invention is suitable for weak magnetic field information measurement.

The invention discloses an optical fiber magnetic field sensor and a preparation method thereof. The optical fiber magnetic field sensor comprises an optical fiber and a plurality of diamond micro-columns, the plurality of diamond micro-columns are positioned at one end in the optical fiber; each diamond micro-column contains a nitrogen-vacancy center; when the optical fiber magnetic field sensoris used for measuring a magnetic field, one end, containing the diamond micro-column, of the optical fiber is placed in an environment of the magnetic field to be measured, and laser with a preset wavelength is emitted from the other end of the optical fiber, so that the the nitrogen-vacancy center is excited to emit fluorescence; and steps of transmitting a sweep frequency signal in a preset frequency range to one end, containing the diamond micro-column, of the optical fiber, collecting fluorescence, and determining the size of the magnetic field to be measured by analyzing the change rule of the intensity of the fluorescence along with the frequency of the sweep frequency signal are carried out. According to the invention, more nitrogen-vacancy centers can be integrated at an optical fiber port, the sensitivity is related to the number of the nitrogen-vacancy centers in the sample, and a magnetometer with higher sensitivity can be obtained through the diamond micro-column sample with higher nitrogen-vacancy center color center density.

The present invention relates to a magnetometer (100) using optically detected magnetic resonance (ODMR), where a solid state material (10), such as diamond, with an ensemble of paramagnetic defects, such as nitrogen vacancies centers NV, is applied. An optical cavity (20) is optically excited by an irradiation laser (25) arranged therefore. A coupling structure (30) causes a microwave excitation (Ω) of the paramagnetic defects, and a permanent magnetic field (40, B_C) causes a Zeeman splitting of the energy levels in the paramagnetic defects. A probing volume (PV) in the solid state material is thereby defined by the spatially overlapping volume of the optical excitation by the irradiation laser (25), the coupling structure (30) also exciting the defects, and the constant magnetic field. The magnetometer then measures an unknown magnetic field by detecting emission (27), e.g. fluorescence, from the defects in the probing volume (PV) from the double excitation of the defects by the irradiation laser, and the coupling structure exciting these defects.

The invention pertains to the field of gyroscopes, in particular—to quantum gyroscopes. The invention provides a gyroscope employing an ensemble of NV-centers in diamond, which includes a diamond plate, a source of green light, an optical system for directing the green light to the diamond plate, a photodetector for registering fluorescence of the color centers in the diamond plate, optical elements that direct the fluorescence from the diamond plate to the photodetector, a source of microwave radiation, a source of radiofrequency radiation, and a source of constant magnetic field, the gyroscope being different from the prior art in that it comprises an energy-efficient antenna that creates a strong longitudinal homogeneous field in the entire volume of the diamond plate with the possibility of frequency adjustment, as well as a system for locking the frequency of the microwave field to that of the transition in the color centers. The invention allows to reduce the volume of the sensing element, provides high relative spectral sensitivity, and allows to create a hybrid device that comprises a 3-axis gyroscope, a magnetometer, and a temperature sensor.

Sensors and methods are provided that include a diamond material containing a nitrogen vacancy center, the diamond material being configured to be exposed to an environment comprising one or more gases, an optical light source configured to excite the nitrogen vacancy center of the diamond material with an optical light beam produced therefrom, a detector configured to detect a signal originating from the diamond material in response to the optical light beam exciting the nitrogen vacancy center, and the capability of analyzing the signal to identify a specific gas in the environment. Also included are levitated spin-optomechanical systems capable of elevating in a vacuum a diamond material containing a nitrogen vacancy center, applying microwave radiation to the diamond material for controlling and flipping the electron spin of the nitrogen vacancy center, and monitoring electron spin of the nitrogen vacancy center.

The invention discloses a nano-diamond-based anti-counterfeiting method, a corresponding medicine, anti-counterfeiting ink and an application thereof. The nano-diamond-based anti-counterfeiting methodcomprises: coating the surface of the article to be subjected to anti-counterfeiting treatment with nano-diamond particles or adding nano-diamond particles into the article to be subjected to anti-counterfeiting treatment. The nano-diamond particle contains nitrogen-vacancy center NV<-> in a negatively charged state and produces fluorescence emitted by the excitation light at the wavelength of 400 nm to 600 nm so that anti-counterfeiting effects are obtained. Under control of the internal structure of the key nano-diamond material, through fluorescence produced by the nano-diamond material containing nitrogen-vacancy center NV<-> in a negatively charged state under excitation light at the wavelength of 400 nm to 600 nm, the anti-counterfeiting effects are effectively achieved.

The position detector disclosed may include: a diamond with nitrogen vacancy centers; an activator configured to activate the nitrogen vacancy centers in the diamond to emit fluorescence signals; a sensor configured to detect the fluorescence signals emitted from the diamond, and a controller configured to control components of the position detector. The controller may be configured to: control the activator to activate the nitrogen vacancy centers in the diamond; control a first EM radiation source to generate one or more EM signals; receive via the sensor one or more first indications of one or more first fluorescence signals; control a second EM radiation source to generate one or more EM signals; receive via the sensor one or more second indications of one or more second fluorescence signals; and calculate the position of the diamond based on the received indications. The position detector has utility in detecting a medical tool in the body of a subject, for example

The invention discloses a quantum diamond precision magnetic measurement system based on single spin, and the system comprises an optical confocal module which is used for generating laser with a preset wavelength, irradiating the laser on a probe, integrating a nitrogen-vacancy center in the probe, and collecting and filtering fluorescence emitted by an NV color center in the probe due to energy level transition; the temperature control module is used for maintaining the temperature environment of the system; the microwave module is used for generating microwaves, accurately radiating the microwaves to the sample and reducing the microwaves radiated to the microwave amplifier so as to reduce the damage to the microwave amplifier; and the scanning probe module is used for realizing alignment of a probe and an objective lens and realizing barrier type scanning imaging of a sample. The system realizes room-temperature atmosphere, multi-mode, quantitative microscopic magnetic property and lossless imaging, and greatly meets the experimental requirements of multiple important fields such as topological magnetic structure, superconducting magnetic imaging and life science in-situ imaging.

The invention generally concerns an enhanced process for detecting spin states of nitrogen vacancy centers in diamonds.

An ensemble of spin defect centers or other atom-like quantum systems in a solid-state host can be used as a compact alternative for an atomic clock thanks to an architecture that overcomes magnetic and temperature-induced systematics. A polariton-stabilized solid-state spin clock hybridizes a microwave resonator with a magnetic-field-insensitive spin transition within the ground state of a spin defect center (e.g., a nitrogen vacancy center in diamond). Detailed numerical and analytical modeling of this polariton-stabilized solid-state spin clock indicates a potential fractional frequency instability below 10^-13 over a 1-second measurement time, assuming present-day experimental parameters. This stability is a significant improvement over the state-of-the-art in miniaturized atomic vapor clocks.