The Application Of Fiber-based Polarization Entangled Photon Pair Source In Quantum Ellipsometry

Polarization entangled photon pairs have been widely employed in quantum communication,quantum cryptography and quantum metrology.Based on polarizationentangled photon pairs,quantum ellipsometry measurement for thin films can be realized.Compare with traditional ellipsometry based on classical light,quantum ellipsometry has the advantage of needing no calibration of the light source and detectors.The study in this thesis focuses on developing fiber-based polarization entangled photon pair source and the corresponding quantum ellipsometry device.The main content of this thesis are listed as follows: Firstly,the developments and applications of polarization entangled photons source and quantum ellipsometry are reviewed,and the requirement of compact quantum ellipsometry devices is pointed out.Secondly,by employing dispersion shifted fiber as the nonlinear medium and by using the pulse pumped spontaneous four wave mixing process,a telecom band all-fiber compact source of polarization entangle photon pairs is experimentally built.The wavelength of the entangled signal and idler photons are 1558.17 nm and 1548.51 nm.Thirdly,a quantum ellipsometry device with single mode fiber coupling ports is further realized based on the polarization entangled photon pair source;by using the quantum ellipsometry methods,the ellipsometric parameters of a silica film on silicon substrate sample is experimentally measured,while the theoretical ellipsometric parameters are also calculated through the simulation model based on the Fresnel equation.The experimentally measured parameters agree with the simulation results,which verifies the reliability of the fiber-based quantum ellipsometry device.