標題: A low cost and large-scale synthesis of 3D photonic crystal with SP2 lattice symmetry
作者: Hsieh, Mei-Li
Chen, Shu-Yu
Kaiser, Alex
Yan, Yang-Jhe
Frey, B.
Bhat, Ishwara
Dahal, Rajendra
Bhattacharya, Sayak
John, Sajeev
Lin, Shawn-Yu
光電工程學系
Department of Photonics
公開日期: 1-Aug-2019
摘要: In this work, a novel lithographic method is proposed to prepare three-dimensional (3D) photonic crystal (PC) that is different from conventional top-down and bottom-up approaches. The method combines a 2D optical mask and off-the-axis double optical exposures to create a desirable 3D PC structure. Since the method uses only two optical exposures of a photo-resist layer, it is inherently a low-cost, high throughput and wafer-scale lithographic method. The method is implemented to make a slanted post 3D PC having the SP2 lattice symmetry. Three types of SP2 3D PC structures were successfully fabricated with a minimum feature size of d=1.5 mu m over a large scale of 8x10 mm(2), without any observable fabrication defects. The SP2 PCs are: (i) SU8 posts in air background, (ii) air pores in CdS background and (iii) Pt coated on SU8 SP2 templates. A spectroscopic study of the SP2 PCs shows select spectral regions of high reflectance, indicating the existence of a photonic stop band. This low-cost and large-scale method could enable broader technological impacts of 3D PC materials in areas such as thermo-photovoltaics and above room-temperature Bose-Einstein Condensation. Furthermore, this off-axis method could lead to the creation of an entirely new class of slanted-rod based photonic crystals, such as topological photonic crystal in 3D. (C) 2019 Author(s).
URI: http://dx.doi.org/10.1063/1.5113549
http://hdl.handle.net/11536/152858
ISSN: 2158-3226
DOI: 10.1063/1.5113549
期刊: AIP ADVANCES
Volume: 9
Issue: 8
起始頁: 0
結束頁: 0
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