“Doubly Terahertz Nano Metamaterials”

  
Ø* Speaker : Prof. Dae Sik Kim [Seoul National University]    
Ø* Place : Demonstration Lecture Hall 122,피망 바카라Postech Information Research Laboratories
Ø* Date & Time :피망 바카라Dec,피망 바카라4(Fri)피망 바카라4:00 ~ 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 important피망 바카라long피망 바카라wavelength피망 바카라electromagnetic피망 바카라waves.
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, and피망 바카라also피망 바카라because피망 바카라the
Control피망 바카라has피망 바카라limited피망 바카라spectral피망 바카라range피망 바카라around피망 바카라resonance.피망 바카라Here,피망 바카라we피망 바카라show피망 바카라that피망 바카라broadband,피망 바카라long
wavelength nano피망 바카라antennas피망 바카라on피망 바카라VO2피망 바카라(vanadium dioxide) films,피망 바카라initially피망 바카라transparent피망 바카라to피망 바카라incoming
electromagnetic waves, achieve a 100,000 to 1 extinction by phase transition피망 바카라of피망 바카라the피망 바카라underlying
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)