Analysis of Digital Optical Phase Conjugation by Using Finite-Difference Time-Domain Method
Date Issued
2010
Date
2010
Author(s)
Yeh, Ming-Yu
Abstract
Due to the complex structure of biological tissues, wave propagateing through turbid medium generates interference and diffraction, generally the image is scattered and blurred. However, in nonlinear optics, with the technique of optical phase conjugation (OPC), for wave propagating through OPC, the wave refocuses to initial emanating point. Digital optical phase conjugation (DOPC) combines electro optical modulator (EOM) and spatial light modulator (SLM), which records forward scattering wave information and digitally reverses the phase information.
In this thesis, we apply the Finite-Difference Time-Domain (FDTD) technique, with additional techniques, to simulate DOPC refocusing phenomenon. Not only we simulate the basic property of DOPC, like placing an object in the simulation area to observe DOPC refocusing phenomenon, altering the width of simulation area to compare the profile of DOPC wave and the profile of incident wave; we also alter the DOPC recording time interval and spatial resolution to find the most efficient wave for DOPC refocusing. Moreover, we make use of these results to simulate DOPC refocusing through turbid medium.
In this thesis, we apply the Finite-Difference Time-Domain (FDTD) technique, with additional techniques, to simulate DOPC refocusing phenomenon. Not only we simulate the basic property of DOPC, like placing an object in the simulation area to observe DOPC refocusing phenomenon, altering the width of simulation area to compare the profile of DOPC wave and the profile of incident wave; we also alter the DOPC recording time interval and spatial resolution to find the most efficient wave for DOPC refocusing. Moreover, we make use of these results to simulate DOPC refocusing through turbid medium.
Subjects
Finite-Different Time-Domain Method (FDTD)
Digital Optical Phase Conjugation (DOPC)
Turbid Medium
Type
thesis
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