“Doubly Terahertz Nano Metamaterials”

  
Ø* Speaker : Prof. Dae Sik Kim [Seoul National University]    
Ø* Place : Demonstration Lecture Hall 122,해외 토토Postech Information Research Laboratories
Ø* Date & Time :해외 토토Dec,해외 토토4(Fri)해외 토토4:00 ~ 5:00 pm

  
ØAbstract
  
  
Thin layers of semiconductors, superconductors, correlated electron systems, and polymers are the
core elements of modern science and technology. Metamaterials research also heavily utilizes thin
films, nonlinear index increases of which caused by photo-excitation, voltage, or temperature have
been used to actively control technologically important해외 토토long해외 토토wavelength해외 토토electromagnetic해외 토토waves.
These control attempts are however met with only partial success, because the l/1,000 ~ l/100,000
films are optically too thin even considering the large dielectric constants, and해외 토토also해외 토토because해외 토토the
Control해외 토토has해외 토토limited해외 토토spectral해외 토토range해외 토토around해외 토토resonance.해외 토토Here,해외 토토we해외 토토show해외 토토that해외 토토broadband,해외 토토long
wavelength nano해외 토토antennas해외 토토on해외 토토VO2해외 토토(vanadium dioxide) films,해외 토토initially해외 토토transparent해외 토토to해외 토토incoming
electromagnetic waves, achieve a 100,000 to 1 extinction by phase transition해외 토토of해외 토토the해외 토토underlying
thin film, thereby increasing the dielectric constant to over 500,000. Our scheme, utilizing strongly
evanescent wavevector components below the nanoscale features, offering orders of magnitudes
tenability of nonlinearities and dielectric constants, bridges the gap between thin film technology,
nanotechnology, and active metamaterials researches.

             Contact Person : Prof. Dong-Eon Kim(054-279-2089, kimd@postech.ac.kr)