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Folded and confined one-dimensional plasmons in modulated wires

✍ Scribed by Florent Perez; Bernard Jusserand; Claus Dahl; Marcel Filoche

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
130 KB
Volume
22
Category
Article
ISSN
0749-6036

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✦ Synopsis

We demonstrate theoretically and experimentally that one-dimensional plasmons of doped wires are either extended or longitudinally confined when the lateral width of the wires is periodically modulated. Theoretical dispersion curves, calculated within a classical framework, reproduce well the experimental dispersion deduced from Raman scattering on deep etched modulated wires. Zone-edge gap openings, increasing with the modulation amplitude, are exhibited. We show that deep etching allows a good control of complex geometries and provides quasi-abrupt boundary conditions.

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Lateral wire arrays have been fabricated from a single modulation-doped GaAs quantum well employing reactive ion etching. Depending on the etch depth, the two-dimensional electron gas (2DEG) in the well acquires different degrees of modulation up to complete confinement. The different regimes are id