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Hole geometry effect on stop-band characteristics of photonic crystal in Ti-diffused LiNbO3 waveguide.
- Source :
-
Materials Chemistry & Physics . Jan2017, Vol. 186, p498-504. 7p. - Publication Year :
- 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 LiNbO 3 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHOTONIC crystals
*LITHIUM niobate
*WAVEGUIDES
*TITANIUM
*CRYSTAL lattices
Subjects
Details
- Language :
- English
- ISSN :
- 02540584
- Volume :
- 186
- Database :
- Academic Search Index
- Journal :
- Materials Chemistry & Physics
- Publication Type :
- Academic Journal
- Accession number :
- 120048130
- Full Text :
- https://doi.org/10.1016/j.matchemphys.2016.11.025