Home¡¡||¡¡About Us¡¡||¡¡News¡¡||¡¡Tabloid¡¡||¡¡Academic Exchanges¡¡||¡¡Equipment information¡¡||¡¡Chinese  
news search
¡¡
NEW10
1 ¡¡Terahertz spatiotemp
2 ¡¡New type of&nbs
3 ¡¡Physicist advancing&
4 ¡¡Harnessing light-pow
5 ¡¡High-sensitivity ter
6 ¡¡Probing for THz
7 ¡¡Aerogel could b
8 ¡¡Surface-specific non
9 ¡¡Detecting hidden&nbs
10 ¡¡'Hot' new&nb
TOP10 click no.
¡¡2009 Conference  121361
¡¡2008 Conference  119512
¡¡Researchers take&nbs 23299
¡¡2014 Conference  20407
¡¡The Research Ac 15320
¡¡The rise of&nbs 13708
¡¡Terahertz Near-Field 13236
¡¡THz Wave Photon 12312
¡¡2014 Conference  10691
¡¡2015 Conference  9458
     news center
Scientists watch a crystal shake
date£º2006-10-08 15:38:36 Click No.£º2335

Source: thznetwork.org

    British researchers say for the first time they have watched light riding through a crystal on the back of vibrations of the atomic lattice.

    Oxford University physicist Andrea Cavalleri and colleagues used X-rays in a lithium tantalate crystal to see the coordinated vibrations of its ions, linked with the passage of particles of low-frequency light called terahertz radiation.

    Lithium tantalate is a material in which an electric field induces a change in the positions of the ions that make up the crystal. The scientists say it¡¯s that behavior that creates the coupling of vibrations in the ion lattice to the oscillating electromagnetic fields of light waves.

    The lattice vibrations can be induced by shining a laser pulse onto the crystal, the scientists explained. As the lattice oscillates, it creates a fluctuating electromagnetic field that takes the form of a light polariton with a frequency close to that of the lattice vibration: at terahertz frequencies, lower than infrared, but higher than microwaves.

    The study marked the first time such polariton-linked vibrations of a crystal have been directly tracked.

    The research appears in the current issue (Aug. 10) of the journal Nature.

 
 

Print | close

Copyright© 2006-2007 www.thznetwork.org.cn All Rights Reserved
No.3, Gaopeng Rd, Hi-tech Development Zone, Chengdu, Sichuan, P.R.China, 610041