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Quantitative spectroscopy on individual wire, slot, bow-tie, rectangular, and square-shaped optical antennas.

07:00 EST 15th November 2013 | BioPortfolio

Summary of "Quantitative spectroscopy on individual wire, slot, bow-tie, rectangular, and square-shaped optical antennas."

By using a recently introduced approach combining a focus-modulation technique with a common-path interferometer, we measure quantitatively the extinction, scattering, and absorption cross-section spectra of individual optical antennas. The experimental results on thin-wire antennas, slot antennas, bow-tie antennas, rectangular antennas, and square-shaped antennas resonating at around 1.4 μm wavelength are discussed. We find increased resonant scattering cross sections for the latter four antennas compared to the thin-wire antenna, both in absolute terms and relative to the absorption cross section. The square-shaped antenna's resonant extinction cross section approaches the limit of a coherent point dipole. However, the ratio of the resonant extinction cross section to the geometrical cross section of 38 is largest for the simple thin-wire antenna.

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Name: Optics letters
ISSN: 1539-4794
Pages: 4597-600

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