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Shape-tailored whispering gallery microcavity lasers designed by transformation optics

Photonics Research 2023年第9期11卷 I0010-I0018页

作者： YONG-HOON LEE honghwi park INBO KIM SANG-JUN park SUNGHWAN RIM BYOUNG JUN park MOOHYUK KIM YUSHIN KIM MYUNG-KI KIM WON SEOK HAN HOSUNG KIM HONGSIK park MUHAN CHOI School of Electronic and Electrical Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Photonic/Wireless Devices Research Division Electronics and Telecommunications Research Institute(ETRI)Daejeon 34129Republic of Korea Digital Technology Research Center Kyungpook National UniversityDaegu 41566Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 02841Republic of Korea

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 *** overcome this problem,deformation of the disk cavity has been mainly ***,the approach cannot avoid significant Q degradation owing to the broken rotational ***,we first report a deformed shape microcavity laser based on transformation optics,which exploits WGMs free from Q *** 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 *** 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 *** 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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