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液晶调制的二维光子晶体Fabry-Perot自准直干涉仪(FPSI)被设计出来并作了理论研究。采用二维时域有限差分法研究了FPSI的透射谱,结果表明透射峰随着液晶有效折射率的增大而向低频移动而峰值间隔几乎保持不变。因此,液晶调制的FPSI可用作可调衰减器或光开关。由于中心工作波长为1.55μm,FPSI的尺寸只有几十个微米,可用在光子集成芯片中。
The Fabry-Perot self-collimating interferometer (FPSI), a two-dimensional liquid crystal-modulated photonic crystal, was designed and theoretically studied. The transmission spectra of FPSI were studied by two-dimensional finite-difference time-domain method. The results show that the transmission peak shifts to low frequency with the increase of the effective refractive index of the liquid crystal, and the peak intervals remain almost unchanged. Therefore, liquid crystal modulated FPSI can be used as an adjustable attenuator or optical switch. Due to the central operating wavelength of 1.55μm, FPSI size only a few dozen microns, can be used in photonic integrated chip.