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Shape-tailored whispering gallery microcavity lasers designed by transformation optics

查看全文 作　　者：YONG-HOON [1]LEE;HONGHWI [1,2]PARK;INBO [3]KIM;SANG-JUN [1]PARK;SUNGHWAN [3]RIM;BYOUNG JUN [4]PARK;MOOHYUK [4]KIM;YUSHIN [4]KIM;MYUNG-KI [4]KIM;WON SEOK [2]HAN;HOSUNG [2]KIM;HONGSIK [1]PARK;MUHAN [1,3]CHOI 高影响力作者 机构地区：[1]School of Electronic and Electrical Engineering,Kyungpook National University,Daegu 41566,Republic of Korea;[2]Photonic/Wireless Devices Research Division,Electronics and Telecommunications Research Institute(ETRI),Daejeon 34129,Republic of Korea;[3]Digital Technology Research Center,Kyungpook National University,Daegu 41566,Republic of Korea;[4]KU-KIST Graduate School of Converging Science and Technology,Korea University,Seoul 02841,Republic of Korea高影响力机构 出　　处：《Photonics Research》索引2023年第11卷第9期,共9页高影响力期刊 基　　金：National Research Foundation of Korea(2020R1A2C3007327);Samsung Research Funding Incubation Center of Samsung Electronics(SRFC-IT1062-05);Development of Creative Technology for ICT(22ZB1100)。 摘　　要：Semiconductor microdisk lasers have great potential as low-threshold,high-speed,and small-form-factor light sources required for photonic integrated circuits because of their high-Q factors associated with long-lived whispering gallery modes(WGMs).Despite these advantages,the rotational symmetry of the disk shape restricts practical applications of the photonic devices because of their isotropic emission,which lacks directionality in far-field emission and difficulty in free-space out coupling.To overcome this problem,deformation of the disk cavity has been mainly attempted.However,the approach cannot avoid significant Q degradation owing to the broken rotational symmetry.Here,we first report a deformed shape microcavity laser based on transformation optics,which exploits WGMs free from Q degradation.The deformed cavity laser was realized by a spatially varying distribution of deep-sub-wavelength-scale(60 nm diameter)nanoholes in an InGaAsP-based multi-quantum-well heterostructure.The lasing threshold of our laser is one-third of that of the same shaped homogeneous laser and quite similar to that of a homogeneous microdisk laser.The results mean that Q spoiling caused by the boundary shape deformation is recovered by spatially varying nanohole density distribution designed by transformation optics and effective medium approximation. 关 键 词：OPTICS TRANSFORMATION DEFORMED
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