Ultrastrong coupling of intersubband plasmons and terahertz metamaterials

Journal Article · Sun Nov 10 23:00:00 EST 2013 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4830092· OSTI ID:22254068

Unterrainer, K.; Darmo, J. ^[1]; Andrews, A. M.; Klang, P.; Strasser, G. ^[2]

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1. Photonics Institute and Center for Micro- and Nanostructures, Vienna University of Technology, Gusshausstr. 27-29, A-1040 Vienna (Austria)
2. Institute for Solid State Electronics and Center for Micro- and Nanostructures, Vienna University of Technology, Floragasse 7, A-1040 Vienna (Austria)

We report on the ultrastrong-coupling between localized plasmons of a planar terahertz metamaterial and intersubband plasmons in a modulation doped quantum well sample. Such a system exhibits the formation of a lower and an upper polariton branch when the metamaterial eigenfrequency is tuned close to resonance with the intersubband transition. We achieve a normalized polariton splitting of 22% and a polaritonic gap of 2.4% of the intersubband transition frequency. In addition to the usual geometrical scaling, we demonstrate the effective tuning of the metamaterial resonance by dry etching with a tuning range of more than 1 THz.

• OSTI ID: 22254068
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 20 Vol. 103; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DOPED MATERIALS
ETCHING
MODULATION
PLASMONS
QUANTUM WELLS
RESONANCE
TUNING