By Paras N. Prasad
For a newbie, this can be a reliable position to begin to appreciate the elemental ideas and instruction of Nanophotonics.
When you really want to do whatever technical during this box, you will want a much more special textual content, or the elemental examine papers themselves, after all. a few of these are referenced right here. different books with an analogous identify have extra of a theoretical foundation, and may be way more important in that admire.
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Additional info for Nanophotonics
Qxd 2/11/2004 36 7:40 AM Page 36 FOUNDATIONS FOR NANOPHOTONICS the excitation to an energy acceptor. Consequently, the excited electron in the energy donor returns to the ground state while an electron in the energy acceptor group is promoted to an excited state. The interaction among energetically equivalent centers produces exciton migration either coherently (through many closely spaced levels forming an exciton band) or incoherently by hopping of an electron–hole pair from one center to another.
If A and B are different, the resulting heterodimer is called an exciplex. It should be emphasized that an exciplex does not involve any electron (charge) transfer between A and B. They both are still neutral species in the exciplex state, but bound together by favorable nanoscopic interactions. The optical emission from these excimeric or exciplex state is considerably red-shifted (toward longer wavelength or lower energy), compared to the emission from the monomeric excited form A*. Furthermore, the excimer or exciplex emission is fairly broad and featureless (no structures in the emission band).
Confinement of electrons and photons to dimensions comparable to their wavelengths produces quantization where only certain discrete values of energies (for electrons) and field distribution (for photons) are permissible. ț Both electrons and photons have finite amplitude in a region, which classically is energetically not allowed for their propagation. For light, this electromagnetic field in the forbidden region is called an evanescent wave, which decays exponentially with the penetration depth.