Research on the Transmittance Spectrum of Wedge Thin Film Filter with Oblique Incidence
YU Kan1, HUANG De-xiu1,2, YIN Juan-juan1, BAO Jia-qi1
1. Huazhong University of Science and Technology, Wenhua College, Wuhan 430074, China 2. Wuhan National Laboratory for Optoelectronics, Wuhan 430074, China
Abstract：Angle-tuned thin film filter is widely used in the DWDM system for its broad tunable wavelength range and high rectangular degree. The transmissivity and the half bandwidth is greatly influenced not only by the incident angle, but also by the wedge angle of the non-paralleled thin film filter. In the present paper, the influences of the wedge angle on the transmissivity and the half bandwidth were detailedly analyzed. The proper wedge angle and the orientation can greatly improve the characteristics of the transmittance spectrum. The angle-tuned thin film filter with 0.8°wedge angle was also fabricated. The experimental results show that keeping the wedge angle with the same orientation to the incident angle will worsen the transmissivity and the rectangular degree of the transmittance spectrum. However, keeping the wedge angle orientation reverse to the incident angle will greatly enhance the transmissivity and the rectangular degree of the filter and its tunable wavelength range will broaden by 10 nm.
Key words：Thin film filter;Wedge angle;Angle-tuned;Oblique incidence;Transmittance spectrum
俞 侃1，黄德修1,2，尹娟娟1，包佳祺1 . 倾斜入射楔形薄膜滤光片的透射光谱研究 [J]. 光谱学与光谱分析, 2013, 33(08): 2290-2293.
YU Kan1, HUANG De-xiu1,2, YIN Juan-juan1, BAO Jia-qi1 . Research on the Transmittance Spectrum of Wedge Thin Film Filter with Oblique Incidence . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(08): 2290-2293.
