title: Junction-type photonic crystal waveguides for notch- and pass-band filtering.
abstract: 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.
authors: School of Information and Communication Technology, Royal Institute of Technology (KTH), Electrum 229, 164 40 Kista, Sweden. naeems@kth.se
authors: Naeem
authors: N
authors: Shahid
authors: Muhammad
authors: M
authors: Amin
authors: Shagufta
authors: S
authors: Naureen
authors: Marcin
authors: M
authors: Swillo
authors: Srinivasan
authors: S
authors: Anand