Ultrastrong coupling of intersubband plasmons and terahertz metamaterials
- Photonics Institute and Center for Micro- and Nanostructures, Vienna University of Technology, Gusshausstr. 27-29, A-1040 Vienna (Austria)
- 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, Vol. 103, Issue 20; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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