{"id":223,"date":"2022-01-05T13:25:38","date_gmt":"2022-01-05T05:25:38","guid":{"rendered":"https:\/\/www.eee.hku.hk\/microLED\/?p=223"},"modified":"2022-01-05T13:25:40","modified_gmt":"2022-01-05T05:25:40","slug":"fiber-coupled-light-emitting-diode-with-a-capillary-bonded-hemispherical-lens","status":"publish","type":"post","link":"https:\/\/www.eee.hku.hk\/microLED\/fiber-coupled-light-emitting-diode-with-a-capillary-bonded-hemispherical-lens\/","title":{"rendered":"Fiber-Coupled Light-Emitting Diode With a Capillary-Bonded Hemispherical Lens"},"content":{"rendered":"\n<p class=\"has-text-align-right wp-block-paragraph\">&#8211; <em>L\u00a0Zhu, SY Huang, PT Lai, and HW Choi<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"820\" height=\"610\" src=\"https:\/\/www.eee.hku.hk\/microLED\/wp-content\/uploads\/2022\/01\/6032712-fig-1-source-large.gif\" alt=\"\" class=\"wp-image-224\"\/><figcaption>Microphotographs showing (a) truncated-conical TC-LED; (b)hemispherical-lens-attached HL-LED; (c) TC-LED coupled to a POF; and (d)HL-LED coupled to a POF.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>IEEE Photonics Technology Letters, vol. 23, 24, pp. 1857-1859 (2011)<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A hemispherical lens capillary-bonded to an InGaN flip-chip light-emitting diode (LED) is demonstrated to efficiently couple light to a plastic optical fiber. The BK-7 hemispherical lens is bonded onto a circularly shaped LED chip with inclined sidewalls cut by laser-micromachining, so that lateral emissions are effectively suppressed. Capillary bonding minimizes air-gap between chip and lens enabling transmission of evanescent waves, thus maximizing overall optical transmission. With the lens attached, emission divergence from the assembly is significantly reduced, diverting rays into the acceptance cone of the fiber. Fiber coupling efficiency as high as 53.8% has been demonstrated.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DOI:<a href=\"https:\/\/doi.org\/10.1109\/LED.2004.826541\" data-type=\"URL\" data-id=\"https:\/\/doi.org\/10.1109\/LED.2004.826541\"> <\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/doi.org\/10.1088\/0957-4484\/19\/25\/255302\" data-type=\"URL\" data-id=\"https:\/\/doi.org\/10.1088\/0957-4484\/19\/25\/255302\" target=\"_blank\"><\/a><a href=\"https:\/\/doi-org.eproxy.lib.hku.hk\/10.1088\/0957-4484\/19\/35\/355203\" data-type=\"URL\" data-id=\"https:\/\/doi-org.eproxy.lib.hku.hk\/10.1088\/0957-4484\/19\/35\/355203\"><\/a><a href=\"https:\/\/doi.org\/10.1109\/JPHOT.2009.2020963\" data-type=\"URL\" data-id=\"https:\/\/doi.org\/10.1109\/JPHOT.2009.2020963\"><\/a><a href=\"https:\/\/doi-org.eproxy.lib.hku.hk\/10.1109\/LPT.2011.2170407\" data-type=\"URL\" data-id=\"https:\/\/doi-org.eproxy.lib.hku.hk\/10.1109\/LPT.2011.2170407\" target=\"_blank\" rel=\"noreferrer noopener\">10.1109\/LPT.2011.2170407<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8211; L\u00a0Zhu, SY Huang, PT Lai, and HW Choi IEEE Photonics Technology Letters, vol. 23, 24, pp. 1857-1859 (2011) A hemispherical lens capillary-bonded to an&hellip;<\/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":[4],"class_list":["post-223","post","type-post","status-publish","format-standard","hentry","category-publications","tag-microled"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/posts\/223","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=223"}],"version-history":[{"count":1,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/posts\/223\/revisions"}],"predecessor-version":[{"id":225,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/posts\/223\/revisions\/225"}],"wp:attachment":[{"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/media?parent=223"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/categories?post=223"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.eee.hku.hk\/microLED\/wp-json\/wp\/v2\/tags?post=223"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}