Open AccessJunction-type photonic crystal waveguides for notch- and pass-band filtering
Author(s) -
Naeem Shahid,
Muhammad Amin,
Shagufta Naureen,
Marcin Świłło,
Srinivasan Anand
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.021074
Subject(s) - photonic crystal , optics , materials science , waveguide , transmission (telecommunications) , wavelength , stopband , insertion loss , band gap , filter (signal processing) , optical filter , optoelectronics , band pass filter , physics , telecommunications , computer science , computer vision
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.