Design of low-loss tapered waveguide by applying photonic-crystal-based microlenses in telescopic structure

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50960

Title:	Design of low-loss tapered waveguide by applying photonic-crystal-based microlenses in telescopic structure
Authors:	Tsai,YL;Lan,HC;Lin,SF;Chang,CC;Hsiao,HL;Lee,YC;Chang,JY;Wu,ML
Contributors:	光電科學與工程學系
Keywords:	CONVERSION;SPLITTERS
Date:	2010
Issue Date:	2012-03-27 18:13:57 (UTC+8)
Publisher:	國立中央大學
Abstract:	In this paper, the design of low-loss tapered waveguides by applying photonic-crystal-based microlenses is presented. The microlenses are realized by using two-dimensional photonic crystal (PhC) structures with a hexagonal periodic lattice of air-holes. In order to make the PhC structures behave as homogeneous and isotropic microlenses, the PhC structures are designed to operate in the low-frequency domain with light wavelength sufficiently larger than the PhC lattice constant. The effective indices of the PhC are calculated and the structures are properly arranged in microlenslike shapes. By monolithically integrating the effective microlenses in the tapered area between the two optical waveguides with different core dimensions, the wavefront of the eigenmode can be coupled from the larger core to the smaller core effectively and also the radiation loss in the tapered area between the two connected optical waveguides can be effectively suppressed. The results show that the PhC-based microlens in the telescopic structure can serve as an optical element in the tapered waveguide with the advantages of low loss, high efficiency and compactness.
Relation:	OPTICAL REVIEW
Appears in Collections:	[Department of Optics and Photonics] journal & Dissertation

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