Abstract
A compact chemical vapor sensor based on a fiber loop mirror (FLM) inserted with
a high-birefringent photonic crystal fiber (HiBi-PCF) is proposed and experimentally
demonstrated. Because the resonant dips of the HiBi-PCF FLM are sensitive to the phase
difference between two counter-propagating waves in the FLM, a highly sensitive chemical
vapor can be achieved by measuring the resonant dip shifts when chemical vapor diffuses
into the air holes of the HiBi-PCF. Experimental results show a high sensitivity of 15.5
pm/ppm for ethanol is obtained when a 5.1 cm long HiBi-PCF is used in the FLM. Three
different mechanisms for the high sensitivity of the proposed sensor are discussed. A
liquefaction model with a full-vector finite element method is proposed and is regarded
as the main contribution.
© 2014 IEEE
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