68 results about "Plasma photonic crystals" patented technology

The invention relates to a method to generate three refraction rates plasma photonic crystal, which uses the following discharge device to reach the goal: the basic structure of discharge device includes two symmetric closed dielectric containers, and between the two containers setting the discharge gap, in the containers, setting discharge electrode fuses, and importing the water into the containers to form the discharge electrodes; by changing the discharge conditions, including changing the applied voltage frequency and amplitude, and the discharge gap shape border and aspect ratio, discharging will produce three refraction rates plasma photonic crystal structure with different cycles, and different lattice constants. Since the electronic density in the plasma channel has the three orders of 1015cm, theoretical studies indicating that such high electronic density is enough to enable the plasma photonic crystal having band gap structure, to prevent the spread of certain frequency lights, and having frequency-selective optical switching function, which has a broad application prospects in the industrial field.

The invention provides a plasma photonic crystal generating device. The plasma photonic crystal generating device comprises an anode plate (1), a combined hollow cathode (4), a vacuum discharge cavity (2), and a Helmholtz coil (3) sleeving the vacuum discharge cavity (2). The combined hollow cathode (4) comprises a plurality of T-shaped cathode base plates (5) which are arranged in parallel on the same plane, and groove-shaped cathodes (6) are formed between every two neighboring T-shaped cathode base plates (5); a flat plate (7) provided with a plurality of through holes is arranged under the combined hollow cathode (4) and is parallel to the combined hollow cathode (4); the plurality of through holes are uniformly arranged right under the groove-shaped cathodes (6). According to the plasma photonic crystal generating device, through structural mold regulation of the flat plate, plasma photonic crystals having the same period distribution with the flat plate can be obtained, so that control over the structural constant of the plasma photonic crystals can be achieved.

The invention relates to a device for producing novel plasma photonic crystal with five refractive indexes and a method for producing the novel plasma photonic crystal with five refractive indexes. The discharging condition is that the thickness of a discharging gap is 2.0mm, impressed voltage is 3.5-5.1kV, frequency is 55-60kHz, discharging gas is 99.1%-99.9%Ar, the remainder is air, air gap pressure is 0.6-0.8atm, temperature range is 285-320K, and humidity range is 70%-90%. According to the device and method, the conditions of the discharging gap, the impressed voltage amplitude and frequency, the content of argon and the like are changed, while the size of a water electrode is optimized, a temperature control adjusting device and a humidity control adjusting device are added, and four types of plasma channels formed by a plasma sheet, a thick plasma column and two types of plasma columns are obtained. The novel plasma photonic crystal structure with the five refractive indexes is formed by the plasma channels and a periodic arrangement self-organization in a non-discharging area. The novel plasma photonic crystal structure is more complex and has wider application prospects.

The invention provides a device and a method for generating uniform and continuous discharge or plasma photonic crystals. The device comprises a discharge mechanism, a gas supply mechanism and a power supply mechanism. The discharge mechanism includes a hollow needle electrode, a dielectric block, and a liquid electrode. The hollow needle electrode is vertically inserted into the dielectric block and is connected with a gas cylinder in the gas supply mechanism through a dielectric tube. The liquid electrode is located below the hollow needle electrode. The hollow needle electrode is electrically connected with the high-voltage output end of a high-voltage DC power supply in the power supply mechanism. The liquid electrode is connected with a ground wire. According to the technical scheme of the invention, only the air in the atmospheric environment is used as a working gas, and the uniform and continuous discharge can be generated between the two electrodes. When an inert gas is introduced into the hollow needle electrode through the dielectric tube, periodically arranged plasma photonic crystals can be generated between the two electrodes. The device utilizes different working gases to generate uniform and continuous discharge or plasma photonic crystals at the atmospheric pressure. Therefore, the diversification of functions is realized.

The invention relates to a device and a method for producing manual and self-organizing composite plasma photonic crystals simultaneously. The device comprises a vacuum reaction chamber, two water electrodes arranged in the vacuum reaction chamber and with opposite electrode plates and a plasma generation power supply electrically connected with the water electrodes. A polyethylene plate is bonded to the inner wall of a discharging medium plate of one water electrode close to the center, round holes distributed in a rectangular array are etched in the polyethylene plate, and a glass frame serving as a discharging boundary is arranged between the two water electrodes. The polyethylene plate with the square round hole array and the inner wall of the discharging medium plate are bonded through insulation adhesive to form a meshing discharging medium plate, the discharging conditions such as the amplitude and the frequency of external voltage, the discharging air gap air pressure and the argon content are changed, a manual and self-organizing composite plasma photonic crystal structure can be generated and has various plasmas, and the device is longer in service life and simpler in operation process.

The invention provides a device for generating stable and controllable plasma photonic crystals and a method thereof. The device comprises a femtosecond laser, a lens group, an adjustable diaphragm, a micro-lens array and a dielectric barrier discharge unit. The lens group includes a concave lens and a convex lens which are arranged in turn. The dielectric barrier discharge unit comprises two opposite liquid electrodes and an AC power supply which is electrically connected with the two liquid electrodes. The focal plane of the micro-lens array is arranged in a discharge gap between the two liquid electrodes. Laser is utilized to initiate discharge, laser is enabled to form periodic plasma filament structures in the gas through the micro-lens array, and stable and controllable plasma photonic crystals of different symmetries are formed by the "memory effect" of dielectric barrier discharge so that the disadvantages of poor reproducibility and controllability due to the fact that existing devices realize the plasma photonic crystals of different symmetries by purely relying on the nonlinear self-organization method of discharge filaments can be overcome.

The invention provides a device and method for generating a single-layer and/or dual-layer plasma photonic crystal. The device comprises a vacuum reaction chamber, two water electrodes and a plasma generation power supply, wherein the two water electrodes are installed in the vacuum reaction chamber; the plasma generation power supply is electrically connected with the water electrodes; a discharge gap with an empty cavity the cross section of which is of an H-type structure is formed between the two water electrodes via left, middle and right layers of sequentially overlapped and fit glass; and the left, middle and right layers of glass are respectively perpendicular to shaft axes of the two water electrodes. By the device provided by the invention, in combination with the method provided by the method, a single-layer photonic crystal, a two-layer photonic crystal or single-layer and dual-layer coexisting plasma photonic crystals can be generated in the discharge gap, so that the selection mode for modulating light is increased; moreover, single-air-gap slit plasma photonic crystals with multiple structures and types are realized for the first time. According to the invention, the wave band for modulating light beams is widened, and the diversification, convenience and high efficiency for light beam modulation are realized.

The invention relates to a device for producing continuous tunable defect mode plasma photonic crystals. The device comprises a discharge power supply, a framework, an alumina ceramic rod array and plasma discharge tubes which are installed on the framework. The formwork comprises two first organic glass plates which are vertically arranged in parallel and multiple supporting tubes which are connected with the two first organic glass plates. The alumina ceramic rod array and the plasma discharge tubes penetrate through the two first organic glass plates. The plasma discharge tubes are arranged among the alumina ceramic rod array. The plasma discharge tubes are connected with the discharge power supply. The invention also relates to a method for producing the continuous tunable defect mode plasma photonic crystals. The device for producing the continuous tunable defect mode plasma photonic crystals has the advantages of simple structure, convenient operation and continuous and tunable defect modes so that a wider space for the research of the plasma photonic crystals is provided and the device is expected to play an important role in industrial application.

The invention provides a device for generating rotating hexagonal plasma photonic crystals and a method thereof. The device comprises a vacuum reaction chamber, two water electrodes which are arranged in the vacuum reaction chamber and a plasma generation power supply which is electrically connected with the water electrodes. A frame is arranged between the two water electrodes. The internal edge of the frame is formed by multiple ratchets which are arranged in turn, and the internal edge of the frame forms the boundary of a discharge gap. When voltage of the plasma generation power supply is certain, the rotating hexagonal plasma photonic crystals are generated in the discharge gap between the two water electrodes. The generated plasma photonic crystals enable the dispersion curve, the band gap center frequency and the band gap width to be changed due to their own rotation under the condition of constant incident light; and the rotating speed can be enhanced by increasing pressure intensity or reducing the content of argon gas and the rotating speed can be reduced in a reverse way so that light propagation selective modulation can be further enriched.

The invention relates to an adjustable plasma photonic crystal frequency-selecting filter. The filter comprises a support box and a plasma generation device arranged in the support box. A first interface and a second interface are arranged at the top and bottom of the support box respectively. The inside of the first interface and the inside of the second interface are both connected with the plasma generation device. One of the outside of the first interface and the outside of the second interface is connected with a drive power supply, and the other is connected with the ground. A rectangular waveguide is arranged on the left side of the support box. A photoelectric signal conversion device is arranged on the right side of the support box. The photoelectric signal conversion device comprises a photodetector and a signal output interface connected with the photodetector. According to the invention, the filter made by a plasma photonic crystal has a good filtering effect within a forbidden band range; the transmitted frequency component is single; the degree of agreement between the actual effect and the design is high; the production cost is low; and adjustable narrowband frequency selection is realized through plasma adjustment.

The invention discloses a two-dimensional plasma photonic crystal band gap control method, which comprises the steps of establishing a two-dimensional plasma photonic crystal model and obtaining the magnitude of the band gap of a two-dimensional plasma photonic crystal by using the reflection coefficient of the model; and expressing plasma frequency by using a Gaussian pulse function, and adjusting and controlling the magnitude of the band gap of the two-dimensional plasma photonic crystal through the variation of the expression of the Gaussian pulse function. By adopting the technical scheme provided by the invention, the distribution of the model is not required to be changed, the control of the band gap of the two-dimensional plasma photonic crystal is realized by changing the magnitude of the plasma frequency, the control method is simple, easy and direct and the requirement on the model is low. The two-dimensional plasma photonic crystal band gap control method is applicable to the adjustment and the control of the band gap of the plasma photonic crystal under the situation of high frequency.

The invention provides an apparatus and a method for generating a three-layer plasma photonic crystal. The apparatus comprises a vacuum reaction chamber, two water electrodes arranged in the vacuum reaction chamber, and a plasma generation power supply electrically connected with the water electrodes, three frames serving as discharging gap boundaries and with different thicknesses are arranged between the two water electrodes side by side, dielectric plates are arranged between two adjacent frames, and the frames and the dielectric plates are respectively vertical to the axes of the two water electrodes. By employing the apparatus, the three-layer plasma photonic crystal with different symmetries is firstly realized; the three-layer plasma photonic crystal can modulate light beams via one layer of the plasma photonic crystal, or modulate the light beams via two adjacent layers of the plasma photonic crystal together, or modulate the light beams via three layers of the plasma photonic crystal together; and the modulation of the light beams is more diversified, and the waveband of the modulated light beams is widened.

The present invention provides a method for generating plasma photonic crystals with different gas temperatures. The method comprises the following steps: arranging two water electrodes in a vacuum reaction chamber, allowing the water electrodes to electrically connect with a plasma generation power supply; arranging a frame between the two water electrodes, and arranging apertures with the diameter of 1.mm in the frame, wherein the distance between two adjacent apertures is 1; pumping air or mixing gas of air and argon into the vacuum reaction chamber to take as discharge gas, wherein the air pressure of discharge gas is adjusted as 0.1-0.55atm; and closing a switch, generating plasma photonic crystals in the discharging gap, and generating plasma photonic crystals with different gas temperatures in adjacent apertures. The method for generating plasma photonic crystals with different gas temperatures firstly realize the plasma photonic crystals with different gas temperatures and increases the selection mode of light modulation, and the method for controlling and adjusting light propagation realizes diversification, convenience and high efficiency of light beam modulation, and has a wide application prospect in the industrial field.

The invention discloses a tunable plasma photonic crystal fiber device. The tunable plasma photonic crystal fiber device comprises a photonic crystal fiber, a high-voltage pulse power supply, a protective resistor, a high-voltage electrode, an insulating piece, a ground electrode, an incident Brewster window and an outgoing Brewster window; an infrared laser enters the photonic crystal fiber through the incident Brewster window and is emitted from the outgoing Brewster window, the high-voltage pulse power supply applies a pulse voltage to the high-voltage electrode, and low-temperature plasmais obtained in a hollow hole filled with inert working gas in a form of dielectric barrier porous discharge to realize the photonic crystal fiber filled with the plasma; and by changing pulse parameters of the high-voltage power supply, the gas pressure of the inert working gas or an electrode spacing, characteristic physical parameters and the gas temperature of the plasma can be adjusted, and infrared band gap characteristics of the photonic crystal fiber can be tuned in a wide range. The tunable plasma photonic crystal fiber device has the advantages of continuous tuning, reconfigurability,wide tuning frequency band and high response speed, and has broad industrial application prospects in the optical communication aspect.

The invention provides a method for generating solid modulating plasma photonic crystals with four refractive indexes. The method comprises the following steps that two water electrodes are arranged in a vacuum reaction chamber, and the water electrodes are electrically connected with a plasma generation power source; a solid frame is arranged between the two water electrodes, a plurality of through holes arranged in a matrix mode are formed in the internal area of the solid frame, and every two adjacent through holes are separated through a solid ridge; mixed gas of air and argon is introduced into the vacuum reaction chamber to serve as discharge gas, and the gas pressure of the discharge gas is adjusted to range from 0.1 atm to 1 atm; a switch is switched on, and the solid modulating plasma photonic crystals with the four refractive indexes and with plasma, the gas and the solid ridges periodically arranged can be generated in discharge gaps. The solid modulating plasma photonic crystals with the four refractive indexes are generated for the first time, spreading of certain frequency light can be stopped, the function of a frequency selective photoswitch is achieved, and the method has wide application prospects in the field of industry.

The present invention provides a device and a method capable of generating a stable and continuous plasma photonic crystal. The device comprises an array liquid electrode and a plane liquid electrodewhich are oppositely arranged, a plurality of channels filled with conductive liquid are distributed in an array mode on the array liquid electrode in an insulating base body, the conductive liquid ineach channel is connected with an electrode wire, the two ends of the insulating base body are respectively provided with medium baffles closing the channels, the electrode wires pass through the medium baffle at one end of the insulating base body and are connected with a discharge power source, the medium baffle at the other end of the insulating base body is arranged oppositely in parallel with the plane of the plane liquid electrode to form a discharge gap, and the plane liquid electrode is a grounding electrode. The device and the method capable of generating the stable and continuous plasma photonic crystal can achieve long-time and continuous existence of the plasma photonic crystal and can perform time periodic modulation for the plasma photonic crystal on the [mu]s order so as tomeet the long-time stable control of the electromagnetic waves with different wave bands.

The invention discloses a method and a special device for generating a time oscillation plasma photonic crystal. The method comprises the following steps of: 1, placing a discharge device in a vacuum tank, mixing a mixed gas of argon and air, and steam, and introducing the mixed gas and the steam in the vacuum tank and a discharge gap of the discharge device; and 2, changing a discharge conditionof the discharge device so as to change the static structure of the plasma photonic crystal into a hexagon super-lattice structure oscillating with time. The device comprises the vacuum tank; a humidification spraying device and the discharge device are arranged in the vacuum tank; a spraying nozzle of the humidification spraying device corresponds to the discharge gas of the discharge device. Bythe plasma photonic crystal generated by the method, the forbidden band position and the width of the plasma photonic crystal can be continuously changed with time without changing the discharge condition.

The invention discloses a device for using solid modulation to generate plasma photonic crystals. The device includes a vacuum reaction chamber, water electrodes and a plasma generation power supply. Two water electrodes are arranged in the vacuum reaction chamber, and a copper-made ring is arranged in each water electrode; the plasma generation power supply is electrically connected with the water electrodes through the copper-made rings; a specially-made solid frame is arranged between the two water electrodes, a plurality through holes which are arranged in a matrix mode are formed in the interior area of the solid frame, and every two adjacent through holes are separated by a solid edge. By the adoption of the device, the plasma photonic crystals formed by periodically arranged plasma, solid plasma photonic crystals, and liquid plasma photonic crystals are generated, wherein the obtained plasma photonic crystals have three or more refractive indexes. According to the device, the solid modulation is adopted to generate the plasma photonic crystals for the first time, the transmission of light rays of certain frequency can be prevented, the effect of a frequency-selectivity optical switch is achieved, and the device has wide application prospects in the industrial field.

The invention discloses an unequal-wideband-gap plasma photonic crystal. The photonic crystal comprises multiple medium layers and multiple plasma layers, and is characterized in that the medium and the plasma are arranged in a staggered manner, the plasma is packaged by the medium at both sides of the plasma, the thickness of the medium of the photonic crystal in an electromagnetic wave incidence portion is different that the thickness of the medium of the photonic crystal in an electromagnetic wave transmission portion, and the thickness of the plasma of the photonic crystal in the electromagnetic wave incidence portion is different from the thickness of the plasma of the photonic crystal in the electromagnetic wave transmission portion. According to the unequal-wideband-gap plasma photonic crystal, an unequal-wideband-gap photonic crystal with a multiple frequencies can be obtained through adjusting the thickness of the medium and the thickness of the plasma in the electromagnetic wave incidence portion and the electromagnetic wave transmission portion.

The invention provides a device capable of generating three-dimensional plasma photonic crystals and provided with three discharge air gaps. The device comprises a vacuum reaction chamber, two water electrodes arranged in the vacuum reaction chamber and a plasma generation power supply electrically connected with the water electrodes, wherein two solid borders which are attached to each other are arranged between the two water electrodes, the thicknesses of the two solid borders are different, a plurality of rectangular through holes are formed in the two solid borders, the rectangular through holes in the two solid borders are perpendicular to each other, the rectangular through holes in the two solid borders are crisscrossed to form a net-shaped through hole structure, and the through holes and the position of the thickness of the single solid border between the adjacent through holes jointly form a discharge air gap. According to the invention, different types of three-dimensional plasma photonic crystals are formed in the three discharge air gaps which are arranged in a staggered manner for the first time.

The invention relates to a method for designing a plasma photonic crystal structure, which comprises the following steps of: constructing a corresponding loss function according to the photonic band gap requirement of the plasma photonic crystal structure; constructing a plasma photonic crystal structure model, determining parameters and corresponding variation ranges of the plasma photonic crystal structure, and initializing a parameter vector formed by the parameters by adopting a particle swarm optimization method; substituting the initialization result into a calculation model corresponding to the plasma photonic crystal structure model, and calculating a transmission coefficient by using a finite difference time domain method to obtain a corresponding loss function value; iteratively updating the optimal parameter vector of the particles and the optimal parameter vector of the population through a particle swarm optimization method; and ending the optimization process of the particle swarm optimization method according to a preset iteration cut-off condition, and determining the plasma photonic crystal structure parameters meeting the photonic band gap requirements. The photonic band gap design of the plasma photonic crystal structure can be quickly realized.