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논문 기본 정보

자료유형
학술저널
저자정보
Rapeepan Kaewon (King Mongkut’s University of Technology Thonburi) Chutchai Pawong (Rajamangala University of Technology Krungthep) Ratchapak Chitaree (Mahidol University) Apichai Bhatranand (Mongkut’s University of Technology Thonburi)
저널정보
한국광학회 Current Optics and Photonics Current Optics and Photonics Vol.2 No.5
발행연도
2018.10
수록면
474 - 481 (8page)

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초록· 키워드

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We propose a polarization phase-shifting technique to investigate the thickness of Ta<SUB>2</SUB>O<SUB>5</SUB> thin films deposited on BK7 substrates, using a modified Sagnac interferometer. Incident light is split by a polarizing beam splitter into two orthogonal linearly polarized beams traveling in opposite directions, and a quarter-wave plate is inserted into the common path to create an unbalanced phase condition. The linearly polarized light beams are transformed into two circularly polarized beams by transmission through a quarter-wave plate placed at the output of the interferometer. The proposed setup, therefore, yields rotating polarized light that can be used to extract a relative phase via the self-reference system. A thin-film sample inserted into the cyclic path modifies the output signal, in terms of the phase retardation. This technique utilizes three phase-shifted intensities to evaluate the phase retardation via simple signal processing, without manual adjustment of the output polarizer, which subsequently allows the thin film’s thickness to be determined. Experimental results show that the thicknesses obtained from the proposed setup are in good agreement with those acquired by a field-emission scanning electron microscope and a spectroscopic ellipsometer. Thus, the proposed interferometric arrangement can be utilized reliably for non-contact thickness measurements of transparent thin films and characterization of optical devices.

목차

I. INTRODUCTION
II. METHODS
III. SIGNAL PROCESSING ALGORITHM TO EVALUATE PHASE RETARDATION
IV. EXPERIMENTAL RESULTS AND DISCUSSION
V. CONCLUSION
REFERENCES

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