Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.11851/3883
Title: Backward propagation of surface slow light in photonic crystals through morphological diversity
Authors: Yeltik, Aydan
Yılmaz, Döne
Kurt, Hamza
Keywords: Photonic crystal
slow light
Bloch mode
surface wave
backward propagation
corrugation angle
Issue Date: Apr-2018
Publisher: SPIE
Source: Yeltik, A., Yılmaz, D. and Kurt, H. (2018, May). Backward propagation of surface slow light in photonic crystals through morphological diversity. In Nanophotonics VII (Vol. 10672, p. 1067217). International Society for Optics and Photonics.
Abstract: We propose and demonstrate photonic crystals (PCs) providing backward-directional propagation of surface slow waves, which is significant for potential PC-based photonic applications. An effective pathway for backward directing of surface slow light along with the modification of other important characteristics is presented via implementing surface morphological diversity in PCs. With the surface orientation angle varying from 900 to 300, the newly appearing bands inside the band gap shift to higher frequencies, and negative group indices up to -100 are observed as the strong indication of backward propagation. Furthermore, dependence of the propagation direction on the surface corrugation angle has been verified via detailed time-domain analyses and microwave experiments using dipole source. As obtained from both the numerical and experimental results, for instance, the structure with 600 provides a well-defined backward propagation. In addition, normalized-delay-bandwidth-product can easily be modified by varying the surface orientation angle in the proposed structures according to the necessities of the application. Furthermore, the group velocity dispersion spectra extracted for each periodic structure exhibit considerably high-range near-zero values as 0.139 ps(2)/m at 900 for the range of 495.54-501.25 nm and 0.176 ps(2)/m at 850 for the range of 495.66-501.25 nm. Third order dispersion spectra also obtained for the proposed PCs show near-zero values as 0.098 ps(3)/m at 900 and 0.113 ps(3)/m at 850 in the corresponding frequency regimes. Facile control of the key characteristics such as backward-directed surface wave propagation in the periodic dielectric structures having morphological diversity serves a great potential for next-generation photonic applications.
URI: https://hdl.handle.net/20.500.11851/3883
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10672/2306854/Backward-propagation-of-surface-slow-light-in-photonic-crystals-through/10.1117/12.2306854.short
ISBN: 978-151061870-1
ISSN: 0277-786X
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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