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

Citation data:

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

Publication Year:
2011
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Citations 8
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Repository URL:
http://hdl.handle.net/10754/561663
PMID:
21997115
DOI:
10.1364/oe.19.021074
Author(s):
Shahid, Naeem; Amin, Muhammad; Naureen, Shagufta; Swillo, Marcin; Anand, Srinivasan
Publisher(s):
The Optical Society; Optical Society of America
Tags:
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.