Determining thickness independently from optical constants by use of ultrafast light

Document Type

Article

Publication Date

10-15-2004

Abstract

We show that the application of ultrafast techniques, especially terahertz time-domain spectroscopy, allows simultaneous measurements of material thickness and optical constants from transmission measurements, by analyzing not only the phase difference between the main terahertz pulse through the medium but also the subsequent multireflection pulse (an echo) from the medium. Such a method provides a fast and precise characterization of the optical properties and can extract thickness information and hence other optical constants in a broad bandwidth. It may have applications in science and engineering such as in situ film thickness and quality monitoring, optical constants measurement, medical imaging, noninvasive detection, and remote sensing. © 2004 Optical Society of America.

Identifier

7544225460 (Scopus)

Publication Title

Optics Letters

External Full Text Location

https://doi.org/10.1364/OL.29.002435

ISSN

01469592

First Page

2435

Last Page

2437

Issue

20

Volume

29

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