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https://hdl.handle.net/20.500.11851/3886
Title: | Rainbow trapping in a tapered photonic crystal waveguide and its application in wavelength demultiplexing effect | Authors: | Neşeli, Berkay Bor, Emre Kurt, Hamza Turduev, Mirbek |
Keywords: | Slow light photonic crystals waveguides |
Publisher: | OSA - The Optical Society | Source: | Neşeli, B., Bor, E., Kurt, H. and Turduev, M. (2020). Rainbow trapping in a tapered photonic crystal waveguide and its application in wavelength demultiplexing effect. JOSA B, 37(5), 1249-1256. | Abstract: | In this paper, we present the numerical and experimental demonstration of a wavelength demultiplexer (WDM) based on the photonic crystal (PC), in which the waveguide has a tapered width. Owing to the tapered waveguide, propagating light can be slowed down and be trapped by a local mode gap effect at certain distances from the entrance of the waveguide. The corresponding effect leads to the localization of four different wavelengths at different points inside the waveguide. The drop-channels are introduced at these specified locations to separate selected wavelengths. Here, we utilized an optimization algorithm to enhance the coupling efficiencies of the introduced drop-channels. The presented WDM PC separates the wavelengths of 22.29, 21.63, 20.80, and 19.87 mm (13.46, 13.87, 14.42, and 15.10 GHz, respectively) into different drop-channels with coupling efficiencies at around 80%. Experimental verifications of the numerically presented results are realized at the microwave frequency regime where the coupling efficiencies of each drop-channel are measured as around 75%. The designed WDM PC structure is all dielectric, compact, and efficient, and it exhibits low cross talk between drop-channels. Experimental measurements show a rainbow-trapping phenomenon and verify the simulation results of wavelength demultiplexing design with the margin of error between 0.8% and 1% frequency shifts in peak transmission values. © 2020 Optical Society of America | URI: | https://hdl.handle.net/20.500.11851/3886 https://www.osapublishing.org/josab/abstract.cfm?uri=josab-37-5-1249 |
ISSN: | 7403224 |
Appears in Collections: | Elektrik ve Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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