Publication detail
Imaging spectroscopic reflectometer based on pellicle beamsplitter
VODÁK, J. ČUDEK, V. NÁDASKÝ, P. OHLÍDAL, M.
Czech title
Zobrazovací spektroskopický reflektometr založený na membránovém děliči
English title
Imaging spectroscopic reflectometer based on pellicle beamsplitter
Type
conference paper
Language
en
Original abstract
Imaging spectroscopic reflectometry is a technique suitable for measurements of local optical parameters (thickness, refraction index and index of extinction) of non-uniform thin films along their surface. It is usually assumed that gradients of these non-uniformities are reasonably small. A new design of an imaging spectroscopic reflectometer provides the possibility to successfully measure high gradient non-uniformities along relatively large area of a thin film surface. A specialized low cost apparatus was developed to accomplish a higher resolution of surface imaging at the cost of reduction of the spectral range usable. The whole concept of the imaging spectroscopic reflectometer was designed to achieve high light throughput using only prefabricated optical components. Shorter measurement times and lower demands on an imaging camera used were achieved. The imaging spectroscopic reflectometer mentioned above was realized as a compact device with easy calibration and handling. Any monochromator with its output into an optical fiber can be used as a source of light. The potential of the device is demonstrated using samples with high gradients of thickness along their surfaces. A significant improvement in the resolution of thin film interference pattern images was observed in comparison with the same images obtained by means of an older UV-VIS-NIR device.
Czech abstract
Zobrazovací spektroskopická reflektometrie je technika vhodná pro měření lokálních optických parametrů (tloušťky, indexu lomu a index uhašení požáru) neuniformních tenkých vrstev podél jejich povrchu. Obvykle se předpokládá, že gradienty těchto neuniformit jsou malé. Nová konstrukce zobrazovacího spektroskopického reflektometru umožňuje měření neuniformit s velkými gradienty na relativně velké ploše tenké vrstvy. Přístroj byl vyvinut jako doplňkový s vysokým rozlišením, sohledem na pořizovací cenu to bylo dosaženo zúžením použitelného spektrálního rozsahu. Celá koncepce zobrazovacího spektroskopického reflektometru byla navržena tak, aby bylo dosaženo vysoké světelné propustnosti pouze pomocí prefabrikovaných optických komponent. Bylo dosaženo kratší doby měření a menších nároků na zobrazovací kameru. Výše uvedený zobrazovací spektroskopický reflektometr byl realizován jako kompaktní zařízení se snadnou kalibraci a manipulací. Jakýkoli monochromátor s výstupem do optického vlákna může být použit jako zdroj světla. Potenciál zařízení je demonstrován použitím vzorků s vysokými gradienty tloušťky podél jejich povrchu. Výrazné zlepšení v rozlišitelnosti interferenčních proužků lze pozorovat ve srovnání se stejnými snímky získanými pomocí staršího UV-VIS-NIR zařízení.
English abstract
Imaging spectroscopic reflectometry is a technique suitable for measurements of local optical parameters (thickness, refraction index and index of extinction) of non-uniform thin films along their surface. It is usually assumed that gradients of these non-uniformities are reasonably small. A new design of an imaging spectroscopic reflectometer provides the possibility to successfully measure high gradient non-uniformities along relatively large area of a thin film surface. A specialized low cost apparatus was developed to accomplish a higher resolution of surface imaging at the cost of reduction of the spectral range usable. The whole concept of the imaging spectroscopic reflectometer was designed to achieve high light throughput using only prefabricated optical components. Shorter measurement times and lower demands on an imaging camera used were achieved. The imaging spectroscopic reflectometer mentioned above was realized as a compact device with easy calibration and handling. Any monochromator with its output into an optical fiber can be used as a source of light. The potential of the device is demonstrated using samples with high gradients of thickness along their surfaces. A significant improvement in the resolution of thin film interference pattern images was observed in comparison with the same images obtained by means of an older UV-VIS-NIR device.
Keywords in English
Imaging spectroscopic reflectometry, pellicle beam splitter,
RIV year
2015
Released
23.09.2015
ISBN
9781628418156
ISSN
0277-786X
Book
Optical Systems Design 2015: Optical Design and Engineering VI
Number
9626
Pages from–to
2L-1–2L-8
Pages count
8
BIBTEX
@inproceedings{BUT116706,
author="Jiří {Vodák} and Vladimír {Čudek} and Pavel {Nádaský} and Miloslav {Ohlídal},
title="Imaging spectroscopic reflectometer based on pellicle beamsplitter",
booktitle="Optical Systems Design 2015: Optical Design and Engineering VI",
year="2015",
number="9626",
month="September",
pages="2L-1--2L-8",
isbn="9781628418156",
issn="0277-786X"
}