Femtosecond laser pulses for fast 3-D surface profilometry of microelectronic step-structures

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Fast, precise 3-D measurement of discontinuous step-structures fabricated on microelectronic products is essential for quality assurance of semiconductor chips, flat panel displays, and photovoltaic cells. Optical surface profilers of low-coherence interferometry have long been used for the purpose, but the vertical scanning range and speed are limited by the micro-actuators available today. Besides, the lateral field-of-view extendable for a single measurement is restricted by the low spatial coherence of broadband light sources. Here, we cope with the limitations of the conventional low-coherence interferometer by exploiting unique characteristics of femtosecond laser pulses, i.e., low temporal but high spatial coherence. By scanning the pulse repetition rate with direct reference to the Rb atomic clock, step heights of similar to 69.6 mu m are determined with a repeatability of 10.3 nm. The spatial coherence of femtosecond pulses provides a large field-of-view with superior visibility, allowing for a high volume measurement rate of similar to 24,000 mm(3)/s. (C) 2013 Optical Society of America
Publisher
OPTICAL SOC AMER
Issue Date
2013-07
Language
English
Article Type
Article
Citation

OPTICS EXPRESS, v.21, no.13, pp.15323 - 15334

ISSN
1094-4087
DOI
10.1364/OE.21.015323
URI
http://hdl.handle.net/10203/175576
Appears in Collection
ME-Journal Papers(저널논문)
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