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Article Dans Une Revue Journal of Optics A: Pure and Applied Optics Année : 2008

Theoretical study of microfiber resonator devices exploiting a phase shift

Résumé

Phase shifts within microfiber resonators can be exploited to demonstrate compact and fast-responding devices. Two examples, a sensor and a bistable device, where the origins of the phase shift are fundamentally different, are investigated. In the sensor the phase change originates from the change of refractive index of the medium surrounding the microfiber ring. This is a linear mechanism which translates into a change of resonance wavelength. Calculations of a silica microfiber ring immersed in an aqueous solution and operating at a wavelength of 1550 nm show that with a fiber 550 nm in diameter the sensitivity approaches a maximal value of about 1137 nm/RIU. In contrast to the sensitivity, the detection limit is critically dependent on the Q factor of the microfiber resonator, and with state of the art microfiber resonators we predict a detection limit of the order of 10−7 RIU. In the bistable device the phase shift is assumed to originate from the nonlinear optical Kerr effect. In contrast to the sensor, the nonlinearity affects the shapes of the resonances, a phenomenon responsible for bistability. Analytical formulae are derived to evaluate the main parameters at play. We investigate the suitability of several glass materials to realize a microfiber bistable device in air operating at a wavelength of 1550 nm. While the threshold for bistability is predicted to be of the order of tens of watts for silica, it drops to less than 30 mW for G2S2, an easily processed chalcogenide glass.

Dates et versions

hal-00491088 , version 1 (10-06-2010)

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Citer

G. Vienne, Philippe Grelu, X. Pan, Y. Li, L. Tong. Theoretical study of microfiber resonator devices exploiting a phase shift. Journal of Optics A: Pure and Applied Optics, 2008, 10, pp.025303. ⟨10.1088/1464-4258/10/2/025303⟩. ⟨hal-00491088⟩
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