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Enhancement of Single Quantum Emitters Using Ultra-Widely Tunable Nanofiber Bragg Cavities

Andreas Wolfgang Schell, Hideaki Takashima, Shunya Kamioka, Yasuko Oe, Shiro Fujita, Masazumi Fujiwara, Oliver J. Benson, Shigeki Takeuchi

Published Jan 1, 2015• 0 citations
Publisher

Abstract

We introduce nanofiber Bragg cavities fulfilling three important requirements: small mode-volume, wide tuning-range, and efficient fiber-coupling. In a first application, we show enhancement of single quantum emitters such as quantum dots and nitrogen vacancy centers.
DOI
10.1364/cleo_at.2015.jtu5a.83

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We report a new gateway to enhance the sponatnesous emission rate of single quantum emitters by introducing a cavity in tilted nanofiber Bragg grating (TNFBG). We found that light emitter's coupling efficiency into the tilted grating structure's guided mode is 65%, with 70 grating periods. This novel tilted structure has a high Q factor ~ 1408.71 and low mode volume ~ 0.66 microm3- an important requirement. Further, the Purcell factor of a quantum light emitter inside the nanofiber is nine times more than that of an emitter on the cavity's surface. The further optimized system with enhanced perfromance can be used the next generation quantum information and quantum metrology application.