Pressure-dependent diffraction spectrum response in photopolymer-based holographic sensor

摘要

A volume grating-based holographic pressure sensor in acrylamide photopolymer has been studied. The pressure sensing response is analyzed using a diffraction spectrum in two kinds of sensor construction methods, i.e., transmission and reflection. In a transmission sensor, the maximum of peak wavelength shifts up to 25 nm under 1.58 x 10(5) Pa pressure. The linear pressure response range exceeds 2.0 x 10(5) Pa and the optimized sensitivity is 4.9 x 10(3) Pa/nm. Compared to the reflection sensor, the transmission sensor with large slanted angle can provide a more excellent sensing performance. The linear and reversible peak wavelength shifts confirm the applicability of the holographic pressure sensor. A photopolymer-based holographic pressure sensor is expected to apply in a cheap and visual pressure sensing field. The transmission grating is a significant candidate for developing the holographic sensor. These experimental results can accelerate the development and practicality of holographic optical elements. (C) 2019 Optical Society of America