| abstract |
The invention designs a high-sensitivity annular-rectangular composite metal hole array optical fiber sensor, which is mainly composed of a fiber body (3) and a fiber end face sensing body (1, 2). The sensing body is composed of a substrate dielectric layer (3), a metal film (2), and a ring-rectangular composite hole array structure (1). The annular-rectangular composite hole array (1) is arranged in a periodic array on the metal film (2) through the metal film (2). The ring-rectangular composite hole array (1) is filled with the medium to be tested, so that the metal film (2), the annular-rectangular composite hole array (1) and the medium to be tested constitute a whole sensor body. The sensor of the invention can effectively adjust the position and size of the transmission peak by changing the structural parameters, enhance the application range and precision of the fiber sensor, and have high sensitivity characteristics in the mid-infrared band. Based on the design of the invention, a high-sensitivity optical fiber sensor with wide spectrum, high precision, adjustable and easy processing can be realized. |