Uberoi , C and Rao, UJ (1979) Electromagnetic wave propagation at the interface between two polar semiconductors. In: Physical Review B: Condensed Matter, 19 (2). pp. 1116-1120.
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The interface between two polar semiconductors can support three types of phonon-plasmon-polariton modes propagating in three well-defined frequency windows ??1?[min(?1,?3),?R1], ??2?[max(?2,?4),?R2], and ??3?[min(?2,?4),?R3]. The limiting frequencies ?1,2,3,4 are defined by ?1(?)=0, ?2(?)=0, and ?R1,2,3 by ?1(?)+?2(?)=0, where ?i(?) are dielectric functions of the two media with i=1,2. The dispersion, decay distances, and polarization of the three modes are discussed. The variation of the limiting frequencies with the interface plasma parameter ???p22/?p12 reveals an interesting feature in the dispersion characteristics of these modes. For the interfaces for which the bulk coupled phonon-plasmon frequencies of medium 1 are greater than the LO frequency or are less than the TO frequency of medium 2, there exist two values of ?=?1 and ?2(<?1) for which ??1 and ??3 are zero, respectively. Hence, for these values of ?, the two interface modes defined by ??1 and ??3 propagate with constant frequencies equal to the bulk coupled phonon-plasmon frequencies of medium 1, i.e., without showing any dispersion.
|Item Type:||Journal Article|
|Additional Information:||Copy right of this article belongs to The American Physical Society.|
|Department/Centre:||Division of Physical & Mathematical Sciences > Mathematics|
|Date Deposited:||29 Oct 2010 05:56|
|Last Modified:||29 Oct 2010 05:56|
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