New hybrid photonic crystal fiber gas sensor with high sensitivity for ammonia gas detection

Abstract

A new hybrid photonic crystal fiber (PCF) with circular rings based microstructure core gas sensor has been proposed for detecting ammonia gas at the wavelength of 1.544 μm. The finite element method has been used for numerical investigation. According to the results, the relative sensitivity is obtained as high as 70.25% at a wavelength of 1.544 μm. Furthermore, high birefringence and effective area are acquired by orders of 1.24 × 10−3 and 13.35 μm2, respectively. Finally, a low confinement loss of 1.202 × 10−1 dB/m is gained at the same wavelength. The absorption spectroscopy system can be used for detecting ammonia gas for experimental work. The theoretical results show that the proposed PCF still exhibits high relative sensitivity for a low concentration of ammonia gas at the wavelength of 1.544 μm, which makes the sensors detect gas precisely and can be used for medical and industrial applications.