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Proceedings Paper

Monitoring processes in photoresist using infrared optical fibers and tunable diode lasers
Author(s): Itzhak Schnitzer; Abraham Katzir; U. Schiessl; Harald Boettner; Maurus Tacke
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Paper Abstract

A novel approach for the problem of in-situ and real time monitoring processes in thin film photoresists is presented. The approach is based on the fact that all the essential processing steps, such as softbaking, exposure, hardbaking, and development, can be monitored by the induced spectral modifications in the infrared spectrum of the resist film. The technique of fiber-optic-based evanescent field spectroscopy, is proposed as the method for measuring these spectral changes. The technique is demonstrated using a silver halide infrared transmitting optical fiber coated with thin photoresist film, as the sensing element, and a tunable lead salt diode laser, as the infrared monochromatic source. As an example, immense changes in the resist IR spectrum, induced by thermolysis, are measured. The advantages of using all-fiber technology for remote real time sensing is further discussed, and the possibility to monitor the resist film temperature and thickness, using the same silver halide fibers, is emphasized.

Paper Details

Date Published: 1 May 1990
PDF: 10 pages
Proc. SPIE 1228, Infrared Fiber Optics II, (1 May 1990); doi: 10.1117/12.18645
Show Author Affiliations
Itzhak Schnitzer, Tel Aviv Univ. (Israel)
Abraham Katzir, Tel Aviv Univ. (Israel)
U. Schiessl, Fraunhofer-Institut fuer Physikalische Messtechnik (Germany)
Harald Boettner, Fraunhofer-Institut fuer Physikalische Messtechnik (Germany)
Maurus Tacke, Fraunhofer-Institut fuer Physikalische Messtechnik (Germany)

Published in SPIE Proceedings Vol. 1228:
Infrared Fiber Optics II
James A. Harrington; Abraham Katzir, Editor(s)

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