Liu Z S, Tibuleac S, Shin D, Young P P, Magnusson R
Department of Electrical Engineering, University of Texas at Arlington, Arlington, Texas 76019, USA.
Opt Lett. 1998 Oct 1;23(19):1556-8. doi: 10.1364/ol.23.001556.
A high-efficiency guided-mode resonance reflection filter is reported. The device consists of a surface-relief photoresist grating and an underlying HfO (2) waveguide layer deposited on a fused-silica substrate. The spectral response measured with a dye-laser beam at normal incidence exhibited a peak reflectance of 98% at a wavelength of 860 nm with sideband reflectance below approximately 5% extending over the wavelength range provided by the dye (800-900 nm). At normal incidence the filter linewidth was 2.2 nm. High-efficiency double-peak resonances occurred at nonnormal incidence, with the spectral locations of the maxima vayring with the incidence angle. The filter response at various angles of incidence agreed well with the theoretically calculated reflectance curves.
报道了一种高效的导模共振反射滤波器。该器件由表面浮雕光刻胶光栅和沉积在熔融石英衬底上的下层HfO₂波导层组成。用染料激光束在正入射下测量的光谱响应在波长860nm处显示出98%的峰值反射率，在染料提供的波长范围（800 - 900nm）内边带反射率低于约5%。在正入射时，滤波器线宽为2.2nm。在非正入射时出现高效双峰共振，最大值的光谱位置随入射角变化。在不同入射角下的滤波器响应与理论计算的反射率曲线吻合良好。
