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BRIGHT NEW WORLD NORBERT KROO HUNGARIAN ACADEMY OF SCIENCES DUBNA, 25.09.2008

BRIGHT NEW WORLD NORBERT KROO HUNGARIAN ACADEMY OF SCIENCES DUBNA, 25.09.2008. The Lycurgus Cup ( glass ; British Museum; 4 th Century A. D.). When illuminated from outside, it appears green. However, when

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BRIGHT NEW WORLD NORBERT KROO HUNGARIAN ACADEMY OF SCIENCES DUBNA, 25.09.2008

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  1. BRIGHT NEW WORLD NORBERT KROO HUNGARIAN ACADEMY OF SCIENCES DUBNA, 25.09.2008

  2. The Lycurgus Cup (glass; British Museum; 4thCentury A. D.) When illuminated from outside, it appears green. However, when illuminated from within the cup, it glows red. Red color is due to very small amounts of gold powder (about 40 parts per million) Surface plasmon oscillations Mesoscopic:~1011 electrons

  3. SURFACE PLASMON POLARITONS are a „NEW TYPE OF LIGHT”, they are 1.BOUND TO THE (METAL) SURFACE, 2.HAVESPECIFIC DISPERSION PROPERTIES, 3.THE DIFFRACTION LIMIT DOES NOT APPLY, 4. MAY BE GUIDED, 5.REPRESENT VERY HIGH ELECTRIC FIELDS, 6.MAY BE LOCALIZED (e.g. to nanospheres or nanoshells) 7.MAY HAVE A BANDGAP, 8.MAY BE THE SUBJECT OF NONLINEAR PROCESSES 9. SHOW NON-CLASSICAL PROPERTIES A POTENTIAL BASIS OF FUTURE NANOOPTICS

  4. 1 ELECTRIC FIELD OF SURFACE PLASMONS From Maxwell’s equations

  5. 2 Excitation of SPO-s !!!?

  6. LASER PULSE EXCITED SURFACE PLASMON NEAR FIELD STM 3 SPO  ↓   thermal TYPICAL RESPONSE SIGNALS AND THEIR PART USED FOR IMAGING

  7. Ag SURFACE, W tip 200x200nm Topographic, SPO and thermal images 23870

  8. 4 SURFACE PLASMON LIGHT GUIDE 38590+92 4000x4000nm Gold images Cut from 5000x5000nm images

  9. 5 GIANT ELECTRIC FIELDS!

  10. 6 100x100nm Gold Topography and SPO near field STM images 34300+02 Au Cut from 200x200nm images

  11. WHAT IS THE ORIGIN OF THE COLOR OF THE LYCURGUS CUP? ANSWER: ``SURFACE PLASMONS’’ • An SPO is a natural oscillation of the electron gas inside a goldnanosphere. • SPO frequency depends on the dielectricfunction of the gold, and the shape of the nanoparticle. • For a sphere the plasma frequency is about 0.58 times the bulk plasma frequency (being in the UV; the SPO frequency is in the visible) (~520nm) Ionic background (not to scale) electron sphere Electron cloud oscillates with frequency of the SPO-s; ions provide restoring force.

  12. 7 SURFACE PLASMON ENERGY, OR MOMENTUM „GAPS” Donor (chromophore), Acceptor (fluorophore)

  13. 8 1.ARRANGEMENT FOR ANGULAR, LASER POWER AND TIME DEPENDENCE MEASUREMENTS (A) 808nm SEMICONDUCTOR LASER B:Similar arrangement, but simpler electronics for angular and spectral property studies of pulsed (790nm, 120fs) laser excited SPO emitted light

  14. 9 Ag SURFACE, W tip 200x200nm 23870

  15. FFT OF THE TOPOGRAPHIC SURFACE PLASMON AND THERMAL IMAGES 23950ss

  16. SQUEEZING IN THE SPO IMAGE

  17. w = 4%

  18. APPLICATIONS OF LOCALIZED PLASMONS

  19. THANK YOU FOR YOUR ATTENTION

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