“Doubly Terahertz Nano Metamaterials”

  
Ø* Speaker : Prof. Dae Sik Kim [Seoul National University]    
Ø* Place : Demonstration Lecture Hall 122,검증 바카라Postech Information Research Laboratories
Ø* Date & Time :검증 바카라Dec,검증 바카라4(Fri)검증 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 important검증 바카라long검증 바카라wavelength검증 바카라electromagnetic검증 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, and검증 바카라also검증 바카라because검증 바카라the
Control검증 바카라has검증 바카라limited검증 바카라spectral검증 바카라range검증 바카라around검증 바카라resonance.검증 바카라Here,검증 바카라we검증 바카라show검증 바카라that검증 바카라broadband,검증 바카라long
wavelength nano검증 바카라antennas검증 바카라on검증 바카라VO2검증 바카라(vanadium dioxide) films,검증 바카라initially검증 바카라transparent검증 바카라to검증 바카라incoming
electromagnetic waves, achieve a 100,000 to 1 extinction by phase transition검증 바카라of검증 바카라the검증 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)