High-sensitivity and high-resolution collaborative determination of birefringence coefficient using weak measurement
- URL: http://arxiv.org/abs/2504.15571v1
- Date: Tue, 22 Apr 2025 03:56:40 GMT
- Title: High-sensitivity and high-resolution collaborative determination of birefringence coefficient using weak measurement
- Authors: Yanqiang Guo, Jiahui Hou, Min Zhang, Ao Wang, Shuqi Gao, Qingchen Liu, Hongyu Li, Xiaomin Guo, Liantuan Xiao,
- Abstract summary: We present a high-sensitivity and high-resolution birefringence coefficient determination system for nm-level membrane films based on weak measurement.<n>A tunable bandwidth light source is exploited to achieve complementary momentum (P-pointer) and intensity (I-pointer) measurements.
- Score: 15.438222098433641
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We present a high-sensitivity and high-resolution birefringence coefficient determination system for nm-level membrane films based on weak measurement, addressing the sensitivity-resolution trade-off. A tunable bandwidth light source is exploited to achieve complementary momentum (P-pointer) and intensity (I-pointer) measurements,enabling calibration-free operation across various bandwidths, and to realize high-precision phase difference monitoring of the measured membranes.This method maps the birefringence effect to a weak-value amplified signal of spectral shift and light intensity. The optimal resolution, achieved at a spectral width of 6 nm, is $1.5 \times 10^{-8}$ RIU, while the optimal sensitivity is achieved when the light source is a narrow-linewidth coherent laser, reaching 4710 mV/RIU. The linear range of the system covers a broad birefringence coefficient range for crystals,from $10^{-6}$ to 0.1. Furthermore, the auxiliary optical path eliminates substrate interference, achieving a detection limit of the birefringence coefficient as low as $10^{-8}$ RIU.This approach, characterized high precision, high sensitivity, and strong robustness, provides an effective solution for the detection of optical nano-thin membrane parameters.
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