## 当期目录

2021, 14(5): 1039-1055. doi: 10.37188/CO.2021-0003

2021, 14(5): 1056-1068. doi: 10.37188/CO.2021-0071

2021, 14(5): 1069-1088. doi: 10.37188/CO.2021-0044

2021, 14(5): 1089-1103. doi: 10.37188/CO.2021-0022

2021, 14(5): 1104-1119. doi: 10.37188/CO.2021-0033

2021, 14(5): 1120-1132. doi: 10.37188/CO.2021-0125

2021, 14(5): 1133-1145. doi: 10.37188/CO.2020-0216

2021, 14(5): 1146-1161. doi: 10.37188/CO.2021-0032

2021, 14(5): 1162-1168. doi: 10.37188/CO.2021-0001

2021, 14(5): 1169-1176. doi: 10.37188/CO.2021-0005

2021, 14(5): 1177-1183. doi: 10.37188/CO.2021-0020

2021, 14(5): 1184-1193. doi: 10.37188/CO.2020-0218

2021, 14(5): 1194-1201. doi: 10.37188/CO.2020-0220

2021, 14(5): 1202-1211. doi: 10.37188/CO.2020-0214

2021, 14(5): 1212-1223. doi: 10.37188/CO.2020-0219

2021, 14(5): 1224-1230. doi: 10.37188/CO.2021-0008

2021, 14(5): 1231-1242. doi: 10.37188/CO.2020-0129

2021, 14(5): 1243-1250. doi: 10.37188/CO.2021-0018

Optical properties of periodic double-well potential are one of the frontier research fields in laser physics and quantum optics. In this work, we have employed time-periodic double-well potential for the investigation of Fano-type resonant tunneling of photon-assisted Dirac electrons in a graphene system. Using a double quantum well structure, it is found that the resonant tunneling of electrons in a thin barrier between the two quantum wells splits the bound state energy levels, and the Fano-type resonance spectrum splits into two asymmetric resonance peaks. The shape of Fano peak is regulated by changing the phase, frequency, and amplitude, that can directly modulate the electronic transport properties of Dirac in graphene. Our numerical analysis shows that the relative phase of two oscillating fields can adjust the shape of the asymmetric Fano type resonance peak. When the relative phase increases from 0 to \begin{document}${\text{π}}$\end{document}, the resonance peak valley moves from one side of the peak to the other. In addition, the asymmetric resonance peak becomes symmetric at critical phase \begin{document}${{3{\text{π}} }/{11}}$\end{document}. Furthermore, the distribution of Fano peaks can be modulated by varying the frequency and amplitude of oscillating field and the structure of the static potential well. Finally, we suggest that these interesting physical properties can be used for the modulation of Dirac electron transport properties in graphene.
In order to realize the demodulation of the cavity length of the fiber-optic FP sensor, a new optical wedge-type non-scanning correlation demodulation system is proposed, and the characteristics and structure of the devices used in the system are analyzed and studied. First, by simulating the light sources with different spectral distributions and the optical wedges with different surface reflectivities, the correlation interference signals are analyzed and the optimal structure parameters of the system components are given. Then by comparing the light intensity distribution characteristics of the Powell prism and cylindrical lens on the linear array CCD, more uniform spectral distribution is achieved. Finally, the specific implementation scheme and data processing method of the demodulation system are given. The experimental results show that when the light source spectrum has a Gaussian distribution and large spectral width and the reflectivity of the wedge surface is \begin{document}$R = 0.5$\end{document}, the characteristics of the correlation interference signal are obvious and convenient for demodulation. Finally, the demodulation system achieves the demodulation effect with an error of less than 0.025% within the cavity length range of 60 μm-100 μm. This optical wedge-type non-scanning correlation demodulation method can realize the sensing demodulation of the fiber-optic FP cavity and improve the power adaptability of different types of fiber-optic FP sensors.