{"id":229,"date":"2022-01-05T13:29:12","date_gmt":"2022-01-05T05:29:12","guid":{"rendered":"https:\/\/www.eee.hku.hk\/microLED\/?p=229"},"modified":"2022-01-05T13:31:25","modified_gmt":"2022-01-05T05:31:25","slug":"tunable-clover-shaped-gan-photonic-bandgap-structures-patterned-by-dual-step-nanosphere-lithography","status":"publish","type":"post","link":"https:\/\/www.eee.hku.hk\/microLED\/tunable-clover-shaped-gan-photonic-bandgap-structures-patterned-by-dual-step-nanosphere-lithography\/","title":{"rendered":"Tunable clover-shaped GaN photonic bandgap structures patterned by dual-step nanosphere lithography"},"content":{"rendered":"\n

– KH Li, Z Ma, and HW Choi<\/em><\/p>\n\n\n\n

\"\"
FE-SEM images showing (a) the ordered hexagonal CP pillar array, (b) the CP clover-shaped PhC, (c) the NCP pillar array, and (d) the NCP clover-shaped PhC.<\/figcaption><\/figure>\n\n\n\n

Applied Physics Letters, vol. 100, 14, pp. 141101 (2012)<\/em><\/strong><\/p>\n\n\n\n

The fabrication of close-packed clover-shaped photonic crystal structure on GaN by dual-step nanosphere lithography is demonstrated. By shrinkage of spheres prior to pattern transfer, a non-closed-packed clover-shaped photonic bandgap (PBG) structure, as designed by modified 3D finite-difference time-domain simulation, is also realized. The PBG of the close-packed and non-close-packed clover-shaped structures is verified through optical transmission spectroscopy, found to agree well with simulated results. A threefold enhancement in photoluminescence (PL) intensity is observed from the optimized structure, when the PBG is tuned to overlap with the emission band of the InGaN\/GaN multi-quantum wells. From time-resolved PL measurements, shortened decay lifetimes are observed.<\/p>\n\n\n\n

DOI: <\/a><\/a><\/a><\/a><\/a><\/a>10.106310.1063\/1.3698392<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

– KH Li, Z Ma, and HW Choi Applied Physics Letters, vol. 100, 14, pp. 141101 (2012) The fabrication of close-packed clover-shaped photonic crystal structure…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[12,6,8,10,11,9],"class_list":["post-229","post","type-post","status-publish","format-standard","hentry","category-publications","tag-led","tag-light-extraction","tag-monolithic","tag-nanosphere","tag-nanostructure","tag-photonic-crystal"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/posts\/229","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/comments?post=229"}],"version-history":[{"count":2,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/posts\/229\/revisions"}],"predecessor-version":[{"id":235,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/posts\/229\/revisions\/235"}],"wp:attachment":[{"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/media?parent=229"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/categories?post=229"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/tags?post=229"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}