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We first experimentally demonstrated ultra-compact four-channel drop filters based on one-dimensional photonic crystal nanocavities. The drop wavelengths were controlled at 7.9±0.3nm spacing by changing the cavity length of the nanobeam cavities on several nanometers. The device size was as small as 7μm × 34μm, and the extinction ratio was as high as 25dB.
© 2017 Optical Society of America
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