Close

Search

Search Menu
Photonics Media Photonics Buyers' Guide Photonics Spectra BioPhotonics EuroPhotonics Vision Spectra Photonics Showcase Photonics ProdSpec Photonics Handbook
More News

Two-Photon Method Images Flip Chips

Facebook Twitter LinkedIn Email Comments
The "face down" mounting of flip chips onto motherboards has provided a more efficient way of packaging processors, but it also has complicated inspection techniques because only the back of the chip is directly observable. Using a phenomenon known as the two-photon optical-beam-induced current effect, researchers at Heriot-Watt University in Edinburgh, UK, have captured two- and three-dimensional images of a 0.35-µm-feature-size flip chip with resolutions down to 1 µm in all three dimensions. The technique, which is reported in the July 1 issue of Applied Physics Letters, uses femtosecond, two-photon excitation at 1.275 µm to induce a photocurrent at specified locations within the chips -- thus using the chip itself as a nonlinear detector.

Photonics Spectra
Aug 2002
As We Go To PressBreaking NewsPresstime BulletinSensors & Detectors

Comments
back to top
Facebook Twitter Instagram LinkedIn YouTube RSS
©2019 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.