Hole geometry effect on stop-band characteristics of photonic crystal in Ti-diffused LiNbO3 waveguide

Quan-Zhou Zhao; Zi-Bo Zhang; Jia-Qi Xu; Wing-Han Wong; Dao-Yin Yu; Edwin Yue-Bun Pun; De-Long Zhang

doi:10.1016/j.matchemphys.2016.11.025

Author(s)

Quan-Zhou Zhao
Zi-Bo Zhang
Jia-Qi Xu
Wing-Han Wong
Dao-Yin Yu
De-Long Zhang

Related Research Unit(s)

Detail(s)

Original language	English
Pages (from-to)	498-504
Journal / Publication	Materials Chemistry and Physics
Volume	186
Publication status	Published - 15 Jan 2017

Link(s)

DOI	DOI https://doi.org/10.1016/j.matchemphys.2016.11.025 Final Published version
	Check@CityULib
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85002736282&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(914f4600-7d33-42ba-b593-7d930b4e50ae).html

Abstract

Effects of finite hole depth and non-cylindrical hole shape on stop-band characteristics of photonic crystal formed by air-hole square lattice in Ti-diffused LiNbO₃ strip waveguide were studied theoretically. The study shows that hole depth determines the contrast of stop-band, and the hole radius and conical angle determine the bandgap and location. Cylindrical holes must be sufficiently deep so as to overlap most of waveguide mode and hence obtain a stop-band with high contrast, sharp edge and broad bandgap. Non-cylindrical holes seriously affect the stop-band features. Conical holes cause low contrast and narrow bandgap, and the stop-band shifts with the conical angle. For the cylindrical-conical hybrid holes, the cylindrical portion determines the desired features. Given the difficulty in fabricating high aspect-ratio cylindrical holes, we propose to fabricate the holes at the bottom of a shallow trench, which is introduced into waveguide surface prior to the hole milling.

Research Area(s)

Computer modelling and simulation, Etching, Optical materials, Optical properties

Citation Format(s)

[ RIS ] [ BibTeX ]

Hole geometry effect on stop-band characteristics of photonic crystal in Ti-diffused LiNbO₃ waveguide. / Zhao, Quan-Zhou; Zhang, Zi-Bo; Xu, Jia-Qi et al.

In: Materials Chemistry and Physics, Vol. 186, 15.01.2017, p. 498-504.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review

Zhao, Q-Z, Zhang, Z-B, Xu, J-Q, Wong, W-H, Yu, D-Y, Pun, EY-B & Zhang, D-L 2017, 'Hole geometry effect on stop-band characteristics of photonic crystal in Ti-diffused LiNbO₃ waveguide', Materials Chemistry and Physics, vol. 186, pp. 498-504. https://doi.org/10.1016/j.matchemphys.2016.11.025

Zhao, Q-Z., Zhang, Z-B., Xu, J-Q., Wong, W-H., Yu, D-Y., Pun, E. Y-B., & Zhang, D-L. (2017). Hole geometry effect on stop-band characteristics of photonic crystal in Ti-diffused LiNbO₃ waveguide. Materials Chemistry and Physics, 186, 498-504. https://doi.org/10.1016/j.matchemphys.2016.11.025

Zhao Q-Z, Zhang Z-B, Xu J-Q, Wong W-H, Yu D-Y, Pun EY-B et al. Hole geometry effect on stop-band characteristics of photonic crystal in Ti-diffused LiNbO₃ waveguide. Materials Chemistry and Physics. 2017 Jan 15;186:498-504. doi: 10.1016/j.matchemphys.2016.11.025

Zhao, Quan-Zhou ; Zhang, Zi-Bo ; Xu, Jia-Qi et al. / Hole geometry effect on stop-band characteristics of photonic crystal in Ti-diffused LiNbO₃ waveguide. In: Materials Chemistry and Physics. 2017 ; Vol. 186. pp. 498-504.