Close

Search

Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
share
Email Facebook Twitter Google+ LinkedIn Comments

Modulation Improves Terahertz Spectroscopy

Photonics Spectra
Nov 2002
Time-domain terahertz spectroscopy shows promise for applications in many disciplines, but the resolution threshold of the technique has been unsuitable for the analysis of thin films. Now a team at RWTH Aachen in Germany has incorporated modulation into a terahertz setup to obtain measurements from 1.2-µm-thick polymer and 100-nm-thick SiO2 films.

In the experiment, which the researchers describe in the Sept. 2 issue of Applied Physics Letters, a shaker operating at 10 to 200 Hz moves the sample and reference out of the focus of the terahertz signal, and a chopper modulates the beam itself. The modified technique may have application in identifying doping variances as low as 4 x 1013/cm3 and in marker-free gene analysis.

Research & Technologyspectroscopy

Comments
Terms & Conditions Privacy Policy About Us Contact Us
back to top
Facebook Twitter Instagram LinkedIn YouTube RSS
©2018 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA, info@photonics.com

Photonics Media, Laurin Publishing
x Subscribe to Photonics Spectra magazine - FREE!
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.