“Doubly Terahertz Nano Metamaterials”

  
Ø* Speaker : Prof. Dae Sik Kim [Seoul National University]    
Ø* Place : Demonstration Lecture Hall 122,바카라 확률Postech Information Research Laboratories
Ø* Date & Time :바카라 확률Dec,바카라 확률4(Fri)바카라 확률4:00 ~ 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 important바카라 확률long바카라 확률wavelength바카라 확률electromagnetic바카라 확률waves.
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, and바카라 확률also바카라 확률because바카라 확률the
Control바카라 확률has바카라 확률limited바카라 확률spectral바카라 확률range바카라 확률around바카라 확률resonance.바카라 확률Here,바카라 확률we바카라 확률show바카라 확률that바카라 확률broadband,바카라 확률long
wavelength nano바카라 확률antennas바카라 확률on바카라 확률VO2바카라 확률(vanadium dioxide) films,바카라 확률initially바카라 확률transparent바카라 확률to바카라 확률incoming
electromagnetic waves, achieve a 100,000 to 1 extinction by phase transition바카라 확률of바카라 확률the바카라 확률underlying
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)