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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

2 Scopus Citations
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Author(s)

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

Detail(s)

Original languageEnglish
Pages (from-to)498-504
Journal / PublicationMaterials Chemistry and Physics
Volume186
Publication statusPublished - 15 Jan 2017

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)

Hole geometry effect on stop-band characteristics of photonic crystal in Ti-diffused LiNbO3 waveguide. / Zhao, Quan-Zhou; Zhang, Zi-Bo; Xu, Jia-Qi; Wong, Wing-Han; Yu, Dao-Yin; Pun, Edwin Yue-Bun; Zhang, De-Long.

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 journalNot applicablepeer-review