Journal
APPLIED OPTICS
Volume 53, Issue 11, Pages 2446-2454Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.53.002446
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Funding
- European Union through the Warsaw University of Technology Development Programme
- National Science Centre [2011/02/A/ST7/00365]
- statutory funds
- Faculty of Mechatronics of Warsaw University of Technology [504M 1143 3038 000]
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High-precision topography measurement of micro-objects using interferometric and holographic techniques can be realized provided that the in-focus plane of an imaging system is very accurately determined. Therefore, in this paper we propose an accurate technique for in-focus plane determination, which is based on coherent and incoherent light. The proposed method consists of two major steps. First, a calibration of the imaging system with an amplitude object is performed with a common autofocusing method using coherent illumination, which allows for accurate localization of the in-focus plane position. In the second step, the position of the detected in-focus plane with respect to the imaging system is measured with white light interferometry. The obtained distance is used to accurately adjust a sample with the precision required for the measurement. The experimental validation of the proposed method is given for measurement of high-numerical-aperture microlenses with subwavelength accuracy. (C) 2014 Optical Society of America
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