Out-coupling of photons from a wavelength-scale cavity has been one of the critical issues of photonic crystal lasers. Two possible configurations, the vertical beaming scheme and the all-fiber coupling scheme, are discussed. In addition, our recent demonstration of a reconfigurable photonic crystal resonator will be explained.
During his stay at AT&T Bell Laboratories, he demonstrated the 850-nm proton-implanted top-emitting VCSELs in 1990. In 1991, he joined the Department of Physics in KAIST and has continued his researches on VCSELs. Recently his main interest lies on photonic band gap laser structures and nano-photonic integrated optical circuits. His laboratory demonstrated various forms of 2D photonic band gap lasers from triangular and rectangular lattices. He received the National Academy of Sciences Award (Natural Science) in 2002 and the 2003 IEEE LEOS Distinguished Lecturer Award. He was elected as an IEEE Fellow in 2007. He co-authored more than 140 international journal papers related to VCSELs and photonic crystals. He is serving as an associate editor of Optics Express.
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