Fiber-coupled photonic crystal resonators for an efficient single photon source = 고효율 단일광자원을 위한 광섬유 결합된 광결정 공진기

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Fiber-coupled photonic crystal resonators are proposed and investigated for realizing an efficient single photon source. Photonic crystal bandgap structures have drawn particular attentions due to their strong light confinement within a wavelength-scale volume, leading to possessing high Purcell factor. The abilities to adjust spectral resonance and spatial location of a photonic crystal micro-resonator relative to a single quantum dot are greatly demanded to demonstrate large Purcell factor which is essential to realize an efficient single photon source. Photon collection of the micro-resonator through an objective lens or an optical fiber must be high. The curved-microfiber is extensively exploited for the photonic crystal resonator in this study. The curved-microfiber efficiently collects photons from a single high Q/V cavity via evanescent coupling and offers abilities of relocation and spectral tuning. A photonic crystal micro-resonator is proposed that is relocatable in two dimensions. A wavelength-scale resonator with high Q-factor (26,000) and high collection efficiency (80%) is formed and repositioned by simply placing and relocating a curved-microfiber to a new position on the surface of a two-dimensional square lattice photonic crystal slab. The formation of the resonator was confirmed by observing lasing of resonators. Infrared microscope images showed that the lasing site is two-dimensionally relocated in-situ. Spectral tuning was demonstrated by modifying the curvature of the microfiber. Functionalities, such as the two-dimensional relocation, spectral tuning and efficient extraction, which the curved-microfiber coupling offers, may provide an alternative way of coupling with a single quantum dot. Various systems are investigated for relocatable photonic crystal resonator by coupling of the curved-microfiber. Triangular lattice photonic crystal slab supports the formation of resonator but large TM loss limits the Q-factor and the efficient photon...
Lee, Yong-Heeresearcher이용희researcher
한국과학기술원 : 물리학과,
Issue Date
466341/325007  / 020057135

학위논문(박사) - 한국과학기술원 : 물리학과, 2011.2 , [ iv, 97 p. ]


Optical Micro-fiber; Optical Microcavity; Single Photon Source; Photonic Crystal; Quantym Dot; 양자점; 미소광섬유; 광 미소공진기; 단일광자원; 광결정

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