Abstract
Nanofiber Bragg cavities (NFBCs) are solid-state microcavities fabricated in an optical tapered fiber. NFBCs are promising candidates as a platform for photonic quantum information devices due to their small mode volume, ultra-high coupling efficiencies, and ultra-wide tunability. However, the quality (Q) factor has been limited to be approximately 250, which may be due to limitations in the fabrication process. Here we report high Q NFBCs fabricated using a focused helium ion beam. Whenan NFBC with grooves of 640 periods is fabricated, the Q factor is over 4170, which is more than 16 times larger than that previously fabricated using a focused gallium ion beam.
Highlights
Efficient coupling of photons emitted from single light emitters into a single-mode fiber is attractive for photonic and quantum applications, such as bio-sensors [1], low-threshold lasers [2], and photonic quantum information devices [3,4,5,6]
We have recently developed nanofiber Bragg cavities (NFBCs) using a gallium-ion type focused ion beam (FIB)
We report high Q factor Nanofiber Bragg cavities (NFBCs) fabricated using a focused helium ion beam
Summary
Efficient coupling of photons emitted from single light emitters into a single-mode fiber is attractive for photonic and quantum applications, such as bio-sensors [1], low-threshold lasers [2], and photonic quantum information devices [3,4,5,6]. In this context, optical nanofibers are an excellent platform for such applications. Optical nanofibers are tapered optical fibers with a radius less than the visible wavelengths at the tapered region [7, 8] They have a high transmittance of almost unity and low-loss interconnection to single-mode fibers. We have developed an efficient single photon source with a coupling efficiency of more than 7% by locating
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