Year: 2007
Type: article
Abstract: We calculate the bound plasmonic modes of a ``quantum metamaterial'' slab, composed of multiple quasi-two-dimensional electron gas (Q2DEG) layers, whose thickness is much smaller than the optical wavelength. For the first order transverse magnetic optical and surface plasmonic modes, we find propagation constants which are independent of both the electron density and scattering rates in the Q2DEGs. This leads to extremely long propagation distances. In a detailed case study of a structure comprising a slab of $\mathrm{Ga}\mathrm{As}∕\mathrm{Al}\mathrm{Ga}\mathrm{As}$ multiple-quantum-well (MQW) material, we find propagation lengths of hundreds of millimeters. In addition, the electric field enhancement associated with the plasmonic resonance is found to be sufficient to induce the condition of ``strong coupling'' between the slab modes and the intersubband transitions in the MQWs.
Source: Physical Review B
Authors: Jonathan Plumridge, Chris Phillips
Institution: Imperial College London
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1964648520