nanotimes News in Brief
chief technology officer at Anasys Instruments and co-author on the paper.
Byeonghee Lee, Craig B Prater and William P King: Lo- rentz force actuation of a heated atomic force micro- scope cantilever, In: Nanotechnology, Volume 23(2012), Number 5, Article 055709, DOI:10.1088/0957- 4484/23/5/055709:
12-01 :: January 2012
volve lattice vibrations, can be remarkably strong,” says Hartwin Peelaers, a postdoctoral researcher and the lead author of the paper. The other authors are Emmanouil Kioupakis, now at the University of Michigan, and Chris Van de Walle, a professor in the UCSB Materials Department and head of the research group.
They found that tin dioxide only weakly absorbs visible light, thus letting most light pass through, so that it is still a useful transparent contact. In their study, the transparency of SnO2
declined when mo-
ving to other wavelength regions. Absorption was 5 times stronger for ultraviolet light and 20 times stronger for the infrared light used in telecommuni- cations.
Image: Three beams of light (red for infrared, yellow for visible light, and violet for ultraviolet) travel through a layer of SnO2
the oxide reduces. © UCSB
Researchers in the Computational Materials Group at the University of California, Santa Barbara (UCSB) have uncovered the fundamental limits on optical transparency in the class of materials known as transparent conducting oxides. The UCSB researchers used cutting-edge calculation methods to investigate tin dioxide (SnO2
), a widely- used conducting oxide.
“Direct absorption of visible light cannot occur in these materials because the next available electron level is too high in energy. But we found that more complex absorption mechanisms, which also in-
Researchers at University of Oxford (U.K.), Kyoto University (JP), CREST (JP) and Japan Science and Technology Corporation (JST) report a synthetic
H. Peelaers, E. Kioupakis, and C. G. Van de Walle: Fun- damental limits on optical transparency of transparent conducting oxides: Free-carrier absorption in SnO2, In: Applied Physics Letters, Vol.100,Issue 1, January 02,2012, Article 011914 [3 pages], DOI:10.1063/1.3671162: http://dx.doi.org/10.1063/1.3671162
. Absorption by the conduction electrons in