Quantum entanglement enabled ellipsometer for phase retardance measurement

• URL: http://arxiv.org/abs/2402.17401v1
• Date: Tue, 27 Feb 2024 10:48:22 GMT
• Title: Quantum entanglement enabled ellipsometer for phase retardance measurement
• Authors: Meng-Yu Xie, Su-Jian Niu, Yin-Hai Li, Zheng Ge, Ming-Yuan Gao, Zhao-Qi-Zhi Han, Ren-Hui Chen, Zhi-Yuan Zhou, and Bao-Sen Shi
• Abstract summary: The accuracy can reach to nanometer scale at extremely low input intensity, and the stability are within 1% for all specimens tested with a compensator involved. Our work paves the way for precision measurement at low incident light intensity, with potential applications in measuring photosensitive materials, active-biological samples and other remote monitoring scenarios.
• Score: 2.9419766179487605
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: An ellipsometer is a vital precision tool used for measuring optical parameters with wide applications in many fields, including accurate measurements in film thickness, optical constants, structural profiles, etc. However, the precise measurement of photosensitive materials meets huge obstacles because of the excessive input photons, therefore the requirement of enhancing detection accuracy under low incident light intensity is an essential topic in the precision measurement. In this work, by combining a polarization-entangled photon source with a classical transmission-type ellipsometer, the quantum ellipsometer with the PSA (Polarizer-Sample-Analyzer) and the Senarmount method is constructed firstly to measure the phase retardation of the birefringent materials. The experimental results show that the accuracy can reach to nanometer scale at extremely low input intensity, and the stability are within 1% for all specimens tested with a compensator involved. Our work paves the way for precision measurement at low incident light intensity, with potential applications in measuring photosensitive materials, active-biological samples and other remote monitoring scenarios.

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