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A Novel Photonic Crystal Fiber Sensor with Three D-shaped Holes Based on Surface Plasmon Resonance
Pibin Bing,Jialei Sui,Shichao Huang,Xinyue Guo,Zhongyang Li,Lian Tan,Jianquan Yao 한국광학회 2019 Current Optics and Photonics Vol.3 No.6
A novel photonic crystal fiber (PCF) sensor with three D-shaped holes based on surface plasmon resonance (SPR) is analyzed in this paper. Three D-shaped holes are filled with the analyte, and the gold film is deposited on the side of three planes. The design of D-shaped holes with outward expansion can effectively solve the uniformity problem of metallized nano-coating, it is beneficial to the filling of the analyte and is convenient for real-time measurement of the analyte. Compared with the hexagonal lattice structure, the triangular arrangement of the clad air holes can significantly reduce the transmission loss of light and improve the sensitivity of the sensor. The influences of the air hole diameter, the distance between D-shaped holes and core, and the counterclockwise rotation angle of D-shaped holes on sensing performance are studied. The simulation results show that the wavelength sensitivity of the designed sensor can be as high as 10100 nm/RIU and the resolution can reach 9.9 × 10 -6 RIU.
Analysis of a photonic crystal fiber sensor with reuleaux triangle
Pibin Bing,Shichao Huang,Xinyue Guo,Hongtao Zhang,Lian Tan,Zhongyang Li,Jianquan Yao 한국광학회 2019 Current Optics and Photonics Vol.3 No.3
The characteristics of a photonic crystal fiber sensor with reuleaux triangle are studied by using the finite element method. The wavelength sensitivity of the designed optical fiber sensor is related to the arc radius of the reuleaux triangle. Whether the core area is solid or liquid as well as the refractive index of the liquid core contributes to wavelength sensitivity. The simulation results show that larger arc radius leads to higher sensitivity. The sensitivity can be improved by introducing a liquid core, and higher wavelength sensitivity can be achieved with a lower refractive index liquid core. In addition, the specific channel plated with gold film is polished and then analyte is deposited on the film surface, in which case the position of the resonance peak is the same as that of the complete photonic crystal fiber with three analyte channels being filled with analyte. This means that filling process becomes convenient with equivalent performance of designed sensor. The maximum wavelength sensitivity of the sensor is 10200 nm/RIU and the resolution is 9.8 × 10 -6 RIU.
Frequency Tuning Characteristics of a THz-wave Parametric Oscillator
Zhongyang Li,Pibin Bing,Degang Xu,Jianquan Yao 한국광학회 2013 Current Optics and Photonics Vol.17 No.1
Frequency tuning characteristics of a THz-wave by varying phase-matching angle and pump wavelength in a noncollinear phase-matching THz-wave parametric oscillator (TPO) are analyzed. A novel scheme to realize the tuning of a THz-wave by moving the cavity mirror forwards and backwards is proposed in a noncollinear phase-matching TPO. The parametric gain coefficients of the THz-wave in a LiNbO3crystal are explored under different working temperatures. The relationship between the poling period of periodically poled LiNbO3 (PPLN) and the THz-wave frequency under the condition of a quasi-phasematching configuration is deduced. Such analyses have an impact on the experiments of the TPO.
Zhongyang Li,Pibin Bing,Shengyuan Xu,Degang Xu,Jianquan Yao 한국광학회 2015 Current Optics and Photonics Vol.19 No.3
Terahertz (THz) wave generation from bulk and periodically poled LiTaO3 (PPLT) with a Cherenkovphase matching scheme is numerically investigated. It is shown that by using the crystal birefringenceof bulk LiTaO3 and a grating vector of PPLT, THz waves can be efficiently generated by differencefrequency generation (DFG) with a Cherenkov phase matching scheme. The frequency tuning characteristicsof the THz wave via varying wavelength of difference frequency waves, phase matching angle, polingperiod of PPLT and working temperature are theoretically analyzed. The parametric gain coefficient inthe low-loss limit and the absorption coefficient of the THz wave during the DFG process in the vicinityof polariton resonances are numerically analyzed. A THz wave can be efficiently generated by utilizingthe giant second order nonlinearities of LiTaO3 in the vicinity of polariton resonances
Zhongyang Li,Kai Zhong,Pibin Bing,Sheng Yuan,Degang Xu,Jianquan Yao 한국광학회 2016 Current Optics and Photonics Vol.20 No.1
Terahertz (THz) generation by a GaP ridge waveguide with a collinear modal phase-matching schemebased on cascaded difference frequency generation (DFG) processes is theoretically analyzed. The cascadedStokes interaction processes and the cascaded anti-Stokes interaction processes are investigated fromcoupled wave equations. THz intensities and quantum conversion efficiency are calculated. Compared withnon-cascaded DFG processes, THz intensities from 11-order cascaded DFG processes are increased to 5.48. The quantum conversion efficiency of 177.9% in cascaded processes can be realized, exceeding theManley-Rowe limit.
Simple denoising method for novel speckle-shifting ghost imaging with connected-region labeling
Sheng Yuan,Xuemei Liu,Pibin Bing 한국광학회 2019 Current Optics and Photonics Vol.3 No.3
A novel speckle-shifting ghost imaging (SSGI) technique is proposed in this paper. This method can effectively extract the edge of an unknown object without achieving its clear ghost image beforehand. However, owing to the imaging mechanism of SSGI, the imaging result generally contains serious noise. To solve the problem, we further propose a simple and effective method to remove noise from the speckle-shifting ghost image with a connected-region labeling (CRL) algorithm. In this method, two ghost images of an object are first generated according to SSGI. A threshold and the CRL are then used to remove noise from the imaging results in turn. This method can retrieve a high-quality image of an object with fewer measurements. Numerical simulations are carried out to verify the feasibility and effectiveness.
Zhongyang Li,Bin Yuan,Silei Wang,Mengtao Wang,Pibin Bing 한국광학회 2018 Current Optics and Photonics Vol.2 No.2
Terahertz (THz) wave generation by periodically poled BaTiO₃ (PPBT) with a quasi-phase-matching (QPM) scheme based on cascaded difference-frequency generation (DFG) is theoretically analyzed. The cascaded DFG processes comprise cascaded Stokes and anti-Stokes processes. The calculated results indicate that the cascaded Stokes processes are stronger than the cascaded anti-Stokes processes. Compared to a noncascaded Stokes process, THz intensities from 20<SUP>th</SUP>-order cascaded Stokes processes increase by a factor of 30. THz waves with a maximum intensity of 0.37 MW/mm² can be generated by 20<SUP>th</SUP>-order cascaded DFG processes when the optical intensity is 10 MW/mm², corresponding to a quantum conversion efficiency of 1033%. The high quantum conversion efficiency of 1033% exceeds the Manley-Rowe limit, which indicates that PPBT is an excellent crystal for THz wave generation via cascaded DFG.
Zhongyang Li,Bin Yuan,Silei Wang,Mengtao Wang,Pibin Bing 한국광학회 2018 Current Optics and Photonics Vol.2 No.3
Stimulated polariton scattering (SPS) from the A₁ transverse optical (TO) modes of BaTiO₃ bulk crystal generating a terahertz (THz) wave with the noncollinear phase-matching (NPM) condition is theoretically investigated. To our best knowledge, this is the first report on THz wave generation from BaTiO₃ bulk crystal via SPS. Phase-matching (PM) characteristics in the NPM configuration are analyzed. Effective parametric gain lengths for the Stokes and THz waves in the NPM configuration are calculated. The effective parametric gain coefficient and absorption coefficient of the THz wave in BaTiO₃ are theoretically simulated. The THz phonon flux densities generated via SPS in BaTiO₃ are theoretically calculated by solving the coupled wave equations under the NPM condition. The PM characteristics and THz-wave parametric gain characteristics in BaTiO₃ are compared to those in MgO:LiNbO₃. The results of the analysis indicate that BaTiO₃ is an attractive optical crystal for efficient THz wave generation via SPS.
Investigation of Stimulated Polariton Scattering from the B₁-symmetry Modes of the KNbO₃ Crystal
Zhongyang Li,Mengtao Wang,Silei Wang,Bin Yuan,Pibin Bing,Degang Xu,Jianquan Yao 한국광학회 2018 Current Optics and Photonics Vol.2 No.1
Stimulated polariton scattering from the B₁-symmetry modes of a KNbO₃ crystal to generate a terahertz wave (THz-wave) with a noncollinear phase-matching scheme is investigated. The frequency-tuning characteristics of the THz-wave by varying the phase-matching angle and pump wavelength are analyzed. The expression for the effective parametric gain length under the noncollinear phase-matching condition is deduced. Parametric gain and absorption characteristics of the THz-wave in KNbO₃ are theoretically simulated. The characteristics of KNbO₃ for a terahertz parametric oscillator (TPO) are compared to those of MgO:LiNbO₃. The analysis indicates that KNbO₃ is an excellent optical crystal for a TPO, to enhance the THz-wave output.
Lian Tan,Bin Yuan,이용준,Silei Wang,Hongtao Zhang,Pibin Bing,Jianquan Yao,Zhongyang Li 한국광학회 2019 Current Optics and Photonics Vol.3 No.4
We present a theoretical research concerning terahertz (THz) wave generation with KTiOPO 4 (KTP) by collinear phase matching (CPM) stimulated polariton scattering (SPS). Both CPM and corresponding nonzero nonlinear coefficients can be simultaneously realized with s→f+f in yz plane, s→f+s with θ < Ω in xz plane and s→f+f with θ > Ω in xz plane. The effective nonlinear coefficients including electronic nonlinearities and ionic nonlinearities are calculated. Based on the parameter values of refractive indices, absorption coefficients and effective nonlinear coefficients, we simulate THz wave intensities generated with CPM SPS by solving coupled wave equations and give the relationship among the maximum THz wave intensity, optimal crystal length and the angle θ. The calculation results demonstrate that CPM SPS with KTP can generate THz waves with high intensities and quantum conversion efficiencies.