Metamaterials have many special electromagnetic characteristics which are not available in natural materials, and it can control electromagnetic wave by properly designing. Researches on metamaterial asymmetric transmission devices are reviewed. The fundamental principle of asymmetric transmission of electromagnetic wave, research achievements of asymmetric transmission devices with linear polarized characteristics in GHz and THz bands and devices with circularly polarized wave are introduced respectively. Analysis shows that metamaterial asymmetric transmission devices are mainly focused on the microwave band, few research is carried out in terahertz band especially in the field of experimental verification. Finally, the development trend of metamaterial asymmetric transmission devices is discussed.

According to the discrete three-dimensional (3D) fluorescence spectrum detection of organic matter in water, the high sensitivity and large dynamic range detection circuit and control software of weak fluorescence signal based on the variable gain and integral amplification technology are designed. Experiment verification is carried out and it’s applied to the on-line detection system for discrete 3D fluorescence of organic matter in water. In the designed circuit, according to the input signal intensity, automatic program control CMOS multi-channel analog switch is used to realize the adjustment of front gain amplifier. Based on the switching charge integrator, the synchronous integral amplification of weak pulse fluorescence signal is realized. Results show that the minimum detection current of the designed circuit is 0.09 μA, dynamic detection range is 0.09 μA～0.21 mA, the detection limit is increased by 79.25 times. In the application of discrete 3D fluorescence detection system of organic matter in water, the system detection sensitivity is guaranteed, and dynamic detection range of fluorescence signal is improved. The high precision measurement of organic matter in water is realized.

Atom interferometry has important prospect in the precise measurement and inertial navigation fields. The high-precision atom interferometer has an urgent need for Raman lasers with low phase noise and high output power. A dual-wavelength synchronous injection-amplification Raman laser preparation scheme based on optical phase-locked loop is designed, and the preparation of high-power Raman laser is achieved. The phase noises of Raman lasers before and after amplification are both below －80 dBc@0.01～1 MHz, and the total output power reaches 400 mW, which can meet the needs of atom interferometer based precision measurement.

Based on the principle of division-of-amplitude laser polarization state detection, a new dynamic detection system for laser polarization is designed. The incident laser is made into three light paths which can change the beam polarized direction, polarized beam splitter, half-wave plate and polarized beam splitter, polarized wave plate and polarized beam splitter. The light intensity power value of outgoing beam is detected. Polarization state of the laser to be measured is shown in Labview custom coordinate system. The measurement results show that the polarized states of linear polarized light, circular polarized light and elliptical polarized light are spindle-shaped, circular, elliptical. With the change of incident laser polarization state, the detection results will change dynamically.

A high precision frequency conversion technology based on microwave photonic link is introduced, which is based on modulation and processing of microwave photonics signal. Radio frequency signal is converted into optical signal by electro-optic conversion, and the frequency is converted up and down through optical filter and acousto-optic frequency shift. Finally high-precision frequency conversion signal is obtained. The system can shift the frequency of RF signal within ±2 MHz in the range of 20 GHz, and the maximum accuracy can reach 100 Hz. Benefiting from the high bandwidth, real-time and high precision of microwave photonic link, the technique can perform high precision real-time frequency conversion of high frequency radio frequency signal in optical domain to overcome frequency limitation and achieve fine frequency regulation of radio frequency signal.

Ripple suppression of high voltage DC power supply is always a key issue in laser power technology. For the ripple suppression problem of high voltage DC power supply for high power lasers, full wave voltage doubler rectifier circuit is used to suppress the ripple of power supply voltage, and the voltage series and capacitor capacity in rectifier circuit are optimized by using neural network. According to the optimized parameters, the ripple suppression experiments are carried out in the actual high voltage power supply. Results show that the designed rectifier circuit can significantly enhance the ripple suppression effect.

A set of RF-electrostatic coupling power supply circuit for segmented linear ion trap is designed for trapping ions and micromotion compensation. The trapping of calcium ions in ion trap is realized. The ion crystal position is determined by observing the fluorescence emitted by ions with CCD camera. The precise control of ion crystal in three-dimensional space is realized by controlling the static voltage on the 12-segment poles in ion trap independently, which reduces the micromotion caused by RF modulation. The ions trapping system can further determine the physical properties of ion crystals, such as the secular motion frequency of ions in ion trap, temperature distribution of ion crystal, and the trapping of multi-component ion crystal.

Ion heating effect incuced by near-field thermal noise of superconducting ion chip at different temperature is investigated based on fluctuation-dissipation theorem. The approximate expressions of electric field fluctuation spectral density under different conditions are obtained by the electric field Green function and multi-layer reflection coefficients. For pure Nb electrode, the near-field thermal noise spectral density is inversely proportional to the electrode thickness when the temperature T is 295 K. The near-field thermal noise spectral density is irrelevant with the electrode thickness when T is 4 K, and the near-field thermal noise can be reduced by over ten orders of magnitude comparing to the case of room temperature. The case that there are Nb2O5 thin films on the surface of niobium electrode is analyzed. Results show that the electric field fluctuation induced by Nb2O5 film occupies the main position. The noise spectral density is proportional to the Nb2O5 thickness. When chip temperature decreases to 4 K, the thermal noise decreases by 5 to 6 orders of magnitude.

Based on the theory of quantum information transfer in spin chain, the effects of two types of magnetic field are investigated for a single qubit information transfer in spin chain with N=4. For the spin chain in magnetic fields, Hamiltonian of the system is diagonalized, and the dynamic behavior of information transfer is considered in magnetic field. Results show that the low-intensity magnetic field which is uniform in space and constant in time has nothing to do with quantum information transfer. The low-intensity magnetic field with the difference value B between the nearest-neighbor lattices and the symmetrical direction to center of the spin chain plays a key role for quantum information transfer. Particularly, for the perfect transfer with fidelity value of 1, the transferring condition is dependent on the magnetic parameter B to a great extent.

Influences of the Dzyaloshinskii-Moriya(DM) coupling constant D, temperature T, uniform external magnetic field B, nonuniform magnetic field b, real coupling constant J and anisotropic parameter Δ on the thermal entanglement concurrence C are investigated in detail. Results show that both the increasing of T and B decrease C, but the increasing of D develops C, and D can also heighten the magnetic field threshold Bt. When B is bigger or less than Bt, b has different influence on C. By comparison, it is found that the B and b have different effects on the area about J and Δ (JΔ>0) where exists thermal entanglement as well as on C. What’s more, as T increases, the variation rule of the range of B in which exists thermal entanglement is different from b. As a result, the thermal entanglement can be controlled by adjusting the values of B, b, J, D, T and Δ in various terrible environments, such as strong external magnetic field, or high temperature environment, which is useful in the research of quantum information in solid systems.

A high quality polarized two-photon entangled state is prepared by using the method of II type parametric down conversion and polarization post selection of nonlinear crystals. The violation of Clauser-Horne-Shimony-Holt (CHSH) and Cavalcanti-Bell (C-B) inequalities to the local realism are experimentally measured in two-photon entangled system, and the values of CHSH, C-B inequalities, 2.64±0.021 and 2.75±0.019, are obtained respectively. The bit flip noise in quantum channels is simulated by linear optical devices, and the robustness of CHSH-type inequality in bit-flipping noise environment is experimentally investigated. Results show that C-B inequality is more robust to noise than CHSH inequality in bit-flipping noise environment, which provides experimental support for further investigating the application of entanglement in quantum information processing.

In wireless sensor network (WSN), how to realize key distribution among sensors with lower computational cost is always an interesting issue. A key distribution scheme based on quantum entanglement exchange is proposed. A hierarchical network based cluster is designed, and the key distribution among the base station and cluster head, cluster head and terminal nodes is realized by broadcast and peer-to-peer communications. The entangled particle distribution is carried out at the base station, and the entanglement exchange is realized. The cluster heads and terminal nodes require only simple measurement operation. The proposed scheme can effectively reduce the computation amount, storage and energy consumption of each node, and improve performance of the whole wireless sensor network.

In routing information protocal (RIP) packet, RIP messages are transmitted by the plain-text way, so it is possible to be eavesdropped, tampered and forged. In order to further improve the security of routing information exchange in RIP, an adaptive quantum RIP algorithm is proposed based on the basic principle of quantum communication. It realizes the effective, safe and fast update of the routing information in autonomous system, and reduces the consumption of entanglement resources as much as possible. Simulation results show that compared with the classical quantum RIP algorithm, the proposed algorithm can efficiently realize the routing table automatic update of router with resource consumption of less entanglement particles, when the network number directly connected to router is larger, or the router number in autonomous system is larger. Results show that the proposed algorithm can better achieve the secure transmission of RIP routing information.

In order to analyze correlation between visual electroencephalograph (EEG) signals and respiratory activities of mice, analogy to the interactivity between electromagnetic field and two-level atom, semiclassical(EEG field classical description) model and quantum(EEG field quantumization) model between outfield and two-state quantum systems describing breath EEG excitation and propagation are established and proved to be correct. Based on coherence theory, a high order coherence analysis model of EEG signal correlation is established. In sleeping state, the mean value of normalized mutual coherence function is about 0.3. The high order self-coherence function curves have high similarity, and it can be concluded that EEG of sleeping state and breath activity must be real correlated. In waking state, the mean value of normalized mutual coherence function is about 0.1. The high order self-coherence function curves have lower similarity, and it can be concluded that EEG of waking state and breath activity must have weak correlation.

In order to study the high-order harmonic emission process in metal nanostructure, the high-order harmonic generation from He+ in bowtie-shaped metal nanostructure is theoretically investigated by solving time-dependent Schrdinger equation. Results show that in bowtie-shaped metal nanostructure, the harmonic radiation cut-off frequency can be extended when the spatial position of He+ is away from the nanostructure gap center. The harmonic cut-off frequency is mainly generated by the positive (negative) parts of laser when He+ is moving away from the gap center of nanostructure along the positive (negative) directions. Due to the limited gap size of metal nanostructure, the maximum cutoff frequency can be found in some specific spatial position of He+. With the control of two-color field, the harmonic spectrum shows a 333 eV super-continuum platform region. By superimposing the harmonics of the platform region, ultrashort ultraviolet pulses with pulse widths ranging from 25 as to 28 as can be obtained.

Passive Fourier transform infrared (FTIR) technology has the advantages of remote operation, on-line analysis and no need for infrared light source etc. Based on the technology, the theory and method of calculating concentration of carbon monoxide (CO) gas at high temperature during combustion in rolling furnace of steel are analyzed. Aiming at the situation that radiation spectral measurement of heating furnace consists of two-layers homogeneous infrared radiation transfer medium, a method of changing the infrared radiation of remote sensing background by temperature control on the outside wall of furnace is proposed to obtain the characteristic spectrum of CO in furnace. Based on the combustion condition in rolling process, CO concentration simulation and analysis are carried out, and the effects of CO temperature measurement error on accuracy of measurement concentration inversion are discussed. The reference data and technical scheme are provided for the practical application of this technology.

A metal nanowire array electro-optic modulator with high modulation coefficient is designed based on surface plasmon resonance (SPR) technology. The reflectivity of reflection spectrum is changed by changing the driving voltage, and electro-optic modulation is achieved. The finite difference time domain (FDTD) method is used to optimize the parameters of metal nanowire array and buffer medium layer, and the influence of structural parameters on reflectivity of reflection spectrum is investigated. Results show that when the metal nanowire diameter is 34 nm, buffer dielectric layer thickness is 1600 nm, the mode coupling ability of electro-optic modulator is the strongest. With the gradually increasing of driving voltage, the total absorption peak of reflectance spectrum appears obviously shift to the right. Electro-optical modulation of the optical signal by electrical signal can be achieved by adjusting the driving voltage loaded on the electrode.

Influence of underwater turbulence on the performance of orbital angular momentum (OAM) communication system is investigated. The change of OAM communication system capacity with different environment parameters and transmission distances is presented. Results show that in underwater turbulence environment, the crosstalk between OAM beam modes is enhanced and channel capacity decreases with the increasing of transmission distance, dissipation rates of turbulent flow and temperature. When the transmission distance approaches 7 m, the channel capacity decreases to half of the original one. When the turbulence kinetic energy dissipation is close to 10－4m2/s3, the capacity decreases to 75% of the theoretical maximum. When the temperature dissipation rate is 10－8K2/s, the channel capacity reduces to half of the theoretical maximum. In underwater environment, salinity disturbance has a greater influence on the capacity performance than that of temperature disturbance.

Influences of Zn vacancy defect on electronic states, magnetic and optical properties of ZnS semiconductor material are investigated by density functional theory first principle. Results show that when the concentration of Zn vacancy defect is 6.25%, ZnS semiconductor material still exhibits a direct band gap structure. Compared with the intrinsic ZnS semiconductor, the band gap is increased by 6.4%, reaching 2.19 eV. The s and p state electrons of defect system form the energy bands near Fermi energy, few in number, and Zn d electrons form the energy bands far from Fermi energy. The Zn vacancy for ZnS semiconductor is a kind of hole doping type and the hole carrier concentration can be increased by Zn vacancy. Its hole carriers within the valence bands are heavy and the electron carriers within the conduction bands are light. Zn vacant ZnS does not show magnetism. The dielectric absorption peak intensity of Zn vacant ZnS semiconductor near 210 nm decreases, the dielectric absorption peak near 170 nm disappears and a weaker dielectric absorption peak near 100 nm emerges.