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In this work, we proposed a compact design of a tunable high-pass filter based on the one-dimensional photonic crystal waveguide. The device design is simple and cut-off wavelength can be tuned by a few geometric parameters. The spectral characteristics of the high-pass filter are calculated for the wavelength range of 1200 nm to 2000 nm. The numerical simulations suggest that the extinction ratio of >22 dB is obtained for the wavelength range lying in the photonic bandgap for the device footprint of 3.4 x 1 μm2. We believe that our findings are useful for the realization of photonic integrated circuit filters with miniaturized footprint.
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Muhammad A. Butt, Sergey A. Fomchenkov, "Compact design of a tunable high-pass filter based on one-dimensional photonic crystal waveguide," Proc. SPIE 11793, Optical Technologies for Telecommunications 2020, 117930C (22 June 2021); https://doi.org/10.1117/12.2591784