We analyze the effect of asymmetric embedding of thin silver layers on the propagation length and the power flow distribution of long-range surface plasmon-polaritons (LRSP). We show that in such configurations LRSP can achieve propagation length which exceeds the value for the symmetric case by up to 3 orders of magnitude.
I n this paper the single-particle Hamiltonian of the electron-(long-wave optical) phonon interaction is discussed for semi-infinite semiconductor superlattices. The dispersion relation of the (Iongwave optical) surface phonon modes is analyzed in detail. These modes are composed from ordinary interface phonons on adjacent interfaces coupling through their macroscopic electric fields to form a surface collective excitation of the whole structure with an electric field having an envelope function decaying exponentially from the surface of the semi-infinite superlattice. The coupling function of the electron-phonon interaction is calculated using a continuum theory. This coupling function describing the modified Frohlich interaction of a single electron with the continuous field of polarization of the surface phonons is discussed and presented in graphical form.In dieser Arbeit wird der Einteilchen-Hamilton-Operator der Elektron-(langwellig-optisches) Phonon-Wechselwirkung von halbunendlichen Halbleiter-Supergittern diskutiert. Im Detail werden die Dispersionskurven der (langwellig-optischen) Oberflachen-Phononen analysiert. Diese Oberfliichen-Phononen stellen kollektive Anregungen der gesamteu Struktur mit von der Oberflache des halbunendlichen Supergitters abklingender Enveloppe-Funktion dar, die aus den einzelnen Grenzflachen-Phononen, lokalisiert an jeder einzelnen Grenzflache des Supergitters, durch Kopplung der makroskopischen elektrischen Felder uber die Schichten hinweg hervorgehen. Die Kopplungsfunktion der Elektron-Phonon-Wechselwirkung wird im Rahmen einer Kontinuumstheorie berechnet. Diese Kopplungsfunktion, welche die modifizierte Frohlich-Wechselwirkung eines einzelnen Elektrons mit dem Polarisationsfeld der Oberflachen-Phononen beschreibt, wird ausfuhrlich diskutiert und graphisch dargestellt.
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