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Phys. Rev. Lett. 104, 223901 (2010) [4 pages]

Spectral Collapse in Ensembles of Metamolecules

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V. A. Fedotov1,*, N. Papasimakis1, E. Plum1, A. Bitzer2,3, M. Walther2, P. Kuo4, D. P. Tsai5, and N. I. Zheludev1,†
1Optoelectronics Research Centre, University of Southampton, SO17 1BJ, United Kingdom
2Department of Molecular and Optical Physics, University of Freiburg, D-79104, Germany
3Institute of Applied Physics, University of Bern, Sidlerstr. 5, CH-3012 Bern, Switzerland
4Institute of Physics, Academia Sinica, Taipei, 11529, Taiwan
5Department of Physics, National Taiwan University, Taipei 10617, Taiwan

Received 5 August 2009; revised 20 April 2010; published 1 June 2010

We report on the first direct experimental demonstration of a collective phenomenon in metamaterials: spectral line collapse with an increasing number of unit cell resonators (metamolecules). This effect, which is crucial for achieving a lasing spaser, a coherent source of optical radiation fuelled by coherent plasmonic oscillations in metamaterials, is linked to the suppression of radiation losses in periodic arrays. We experimentally demonstrate spectral line collapse at microwave, terahertz and optical frequencies.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.104.223901
DOI:
10.1103/PhysRevLett.104.223901
PACS:
41.20.Jb

*vaf@orc.soton.ac.uk

†www.nanophotonics.org.uk/niz

 
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