High-sensitivity wedge-shaped SMF-SPR gas sensor with extremely simple structure

• Main Authors: LIU WEI, LIU QIANG, WANG JIANXIN, LIU MEIQI, LUO XINGDI, MENG TONGYU, HE JIE, YANG LIN, LIU CHAO, LYU JINGWEI
• Format: Patent
• Language: Chinese; English
• Published: 18.08.2023
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention relates to a gas sensor, in particular to a high-sensitivity wedge-shaped SMF-SPR gas sensor with an extremely simple structure, the high-sensitivity wedge-shaped SMF-SPR gas sensor is a single-mode optical fiber, the single-mode optical fiber is composed of a fiber core and a cladding, the cladding is provided with a V-shaped groove, the inner side of the cladding of the V-shaped groove is coated with a gold film, and the other side of the cladding of the V-shaped groove is coated with a gas-sensitive film; the top angle of the V-shaped groove is 28-32 degrees, the radius of the fiber core is 3-5 mm, the radius of the cladding is 18-22 mm, the thickness of the gold film is 18-22 nm, and the thickness of the gas-sensitive film is 280-300 nm; the background material of the fiber core is silicon dioxide, and the refractive index of the background material is 1.44; and the V-shaped groove is a wedge-shaped V-shaped groove formed by polishing on the cladding by using a femtosecond technology. The se