Junction-type photonic crystal waveguides for notch- and pass-band filtering
2011 (English)In: Optics Express, ISSN 1094-4087, Vol. 19, no 21, 21074-21080 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2011. Vol. 19, no 21, 21074-21080 p.
Guided waves; Integrated optics materials; Systems design ; Waveguides, planar; Photonic integrated circuits; Dispersion; Photonic crystals
Engineering and Technology Natural Sciences
IdentifiersURN: urn:nbn:se:kth:diva-44514DOI: 10.1364/OE.19.021074ISI: 000296065700128ScopusID: 2-s2.0-80053961154OAI: oai:DiVA.org:kth-44514DiVA: diva2:450804
FunderSwedish Research Council
QC 201111142011-10-222011-10-212012-08-31Bibliographically approved