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Ensemble Force Spectroscopy by Shear Forces
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Spectral collapse in ensembles of metamolecules
V A Fedotov1, N Papasimakis, E Plum
1Optoelectronics Research Centre, University of Southampton, SO17 1BJ, United Kingdom. vaf@orc.soton.ac.uk
Physical Review Letters
|September 28, 2010
Summary
We experimentally demonstrated spectral line collapse in metamaterials, a key effect for developing spasers (coherent optical sources). This phenomenon, observed across microwave to optical frequencies, suppresses radiation losses in periodic arrays.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanophotonics
Background:
- Metamaterials offer unique electromagnetic properties.
- Achieving a lasing spaser requires coherent plasmonic oscillations.
- Suppression of radiation losses is critical for light-matter interactions.
Purpose of the Study:
- To experimentally demonstrate spectral line collapse in metamaterials.
- To link spectral line collapse to the suppression of radiation losses.
- To validate this phenomenon across multiple frequency regimes.
Main Methods:
- Fabrication of metamaterial unit cells with varying numbers of resonators.
- Experimental measurements of spectral properties at microwave, terahertz, and optical frequencies.
- Analysis of radiation loss mechanisms in periodic metamaterial arrays.
Main Results:
- Direct experimental observation of spectral line collapse with increasing metamaterial unit cells.
- Demonstration of the phenomenon at microwave, terahertz, and optical frequencies.
- Correlation between spectral line collapse and suppressed radiation losses.
Conclusions:
- Spectral line collapse is a demonstrated collective phenomenon in metamaterials.
- This effect is essential for the realization of lasing spasers.
- The findings pave the way for advanced coherent optical sources.
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