Junction-type photonic crystal waveguides for notch- and pass-band filtering.

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Optics express, ISSN: 1094-4087, Vol: 19, Issue: 21, Page: 21074-80

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Shahid, Naeem; Amin, Muhammad; Naureen, Shagufta; Swillo, Marcin; Anand, Srinivasan
The Optical Society; Optical Society of America
Physics and Astronomy
article description
Evolution of the mode gap and the associated transmission mini stop-band (MSB) as a function of photonic crystal (PhC) waveguide width is theoretically and experimentally investigated. The change of line-defect width is identified to be the most appropriate way since it offers a wide MSB wavelength tuning range. A high transmission narrow-band filter is experimentally demonstrated in a junction-type waveguide composed of two PhC waveguides with slightly different widths. The full width at half maximum is 5.6 nm; the peak transmission is attenuated by only ~5 dB and is ~20 dB above the MSBs. Additionally, temperature tuning of the filter were also performed. The results show red-shift of the transmission peak and the MSB edges with a gradient of dλ/dT = 0.1 nm/°C. It is proposed that the transmission MSBs in such junction-type cascaded PhC waveguides can be used to obtain different types of filters.