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21 April 2017 Nanofiber Bragg grating cavities (Conference Presentation)
Andreas W. Schell, Hideaki Takashima, Hironaga Maruya, Atsushi Fukuda, Shigeki Takeuchi
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Proceedings Volume 10090, Laser Resonators, Microresonators, and Beam Control XIX; 100900N (2017) https://doi.org/10.1117/12.2251275
Event: SPIE LASE, 2017, San Francisco, California, United States
Abstract
Funnelling the light emitted from quantum emitters like atoms, molecules, or defect centers into the guided mode of a single mode optical fiber is highly important for scaling up quantum optics experiments, since it provides the possibility to interconnect experiments at different locations and ensures high mode overlap of photons from different sources. Here, we present a photonic nanocavity on a tapered optical fiber. The cavities are formed by two Bragg mirrors fabricated by an ion beam [1]. Characterization in terms of transmission, reflection, and polarization are performed and compared with numerical simulations [2]. The quality factors of the fabricated devices can reach values over 300 while the mode volume is smaller than the cubic wavelength. Simulations indicate that a Purcell enhancement of 19.1 with 82 % coupling efficiency can be reached using this cavities. A comparison of cavities fabricated using a gallium beam is compared with cavities made using a helium beam giving insights about implantation of gallium in the ion beam milling fabrication of resonators. Using the knowledge from experiment and simulation, new designs for nanofiber Bragg grating cavities are developed and tested.

[1] A W Schell et al. Sci. Rep. 5, 9619 (2015)

[2] H Takashima et al. Opt. Express 24, 15050-15058 (2016)
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Andreas W. Schell, Hideaki Takashima, Hironaga Maruya, Atsushi Fukuda, and Shigeki Takeuchi "Nanofiber Bragg grating cavities (Conference Presentation)", Proc. SPIE 10090, Laser Resonators, Microresonators, and Beam Control XIX, 100900N (21 April 2017); https://doi.org/10.1117/12.2251275
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KEYWORDS
Fiber Bragg gratings
Nanofibers
Gallium
Ion beams
Chemical species
Light
Molecules
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