Bark Hyeon Sang, Jeon Tae-In
Opt Express. 2018 Oct 29;26(22):29353-29362. doi: 10.1364/OE.26.029353.
A variable grating period made of quartz has been applied to fabricate a tunable guided mode resonance (TGMR) filter with transverse-electric (TE) and -magnetic (TM) modes in the terahertz (THz) region. We prepared three TGMR filters with grating periods of 5.0, 3.3, and 1.7 μm/mm over the length of the filter. For the 5.0 μm/mm, the resolution of resonance frequency shift of the TE, TE, and TM was 3.6, 4.0, and 3.4 GHz/mm, respectively. With a metal slit spacing of 2 mm located in front of the TGMR filter, the movable range of the TGMR was 24 mm, and the resonance frequency could be shifted up to 87, 96, and 82 GHz, where the center frequencies of each resonance were 0.402, 0.579, and 0.460 THz, for the TE, TE, and TM, respectively. Furthermore, because the TGMR and guided mode resonance (GMR) filters are placed independently in the THz beam path, both tunable and fixed resonances can be obtained at the same time in the spectrum.
由石英制成的可变光栅周期已被用于制造太赫兹（THz）波段具有横电（TE）和横磁（TM）模式的可调谐导模共振（TGMR）滤波器。我们制备了三个TGMR滤波器，在滤波器长度上光栅周期分别为5.0、3.3和1.7μm/mm。对于5.0μm/mm的情况，TE、TE和TM模式的共振频率偏移分辨率分别为3.6、4.0和3.4GHz/mm。在TGMR滤波器前方设置2mm的金属狭缝间距时，TGMR的可移动范围为24mm，共振频率可分别向上偏移87、96和82GHz，其中TE、TE和TM模式各自共振的中心频率分别为0.402、0.579和0.460THz。此外，由于TGMR滤波器和导模共振（GMR）滤波器在太赫兹光束路径中是独立放置的，因此在光谱中可以同时获得可调谐共振和固定共振。
