올림픽 토토PHYSICS/BK21 Colloquium[09.12.4]

                
“Doubly Terahertz Nano Metamaterials”

  
Ø* Speaker : Prof. Dae Sik Kim [Seoul National University]
Ø* Place : Demonstration Lecture Hall 122,올림픽 토토Postech Information Research Laboratories
Ø* Date & Time :올림픽 토토Dec,올림픽 토토4(Fri)올림픽 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 important올림픽 토토long올림픽 토토wavelength올림픽 토토electromagnetic올림픽 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, and올림픽 토토also올림픽 토토because올림픽 토토the
Control올림픽 토토has올림픽 토토limited올림픽 토토spectral올림픽 토토range올림픽 토토around올림픽 토토resonance.올림픽 토토Here,올림픽 토토we올림픽 토토show올림픽 토토that올림픽 토토broadband,올림픽 토토long
wavelength nano올림픽 토토antennas올림픽 토토on올림픽 토토VO2올림픽 토토(vanadium dioxide) films,올림픽 토토initially올림픽 토토transparent올림픽 토토to올림픽 토토incoming
electromagnetic waves, achieve a 100,000 to 1 extinction by phase transition올림픽 토토of올림픽 토토the올림픽 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)