期刊
OPTICS EXPRESS
卷 17, 期 26, 页码 24084-24095出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.17.024084
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资金
- Northrop Grumman's Space Technology Research Labs
- US Department of Defense
- Air Force Office of Scientific Research [F49550-04-1-0437]
Using Mie theory we derive a number of general results concerning the resonances of spherical and cylindrical dielectric antennas. Specifically, we prove that the peak scattering cross-section of radiation-limited antennas depends only on the resonance frequency and thus is independent of refractive index and size, a result which is valid even when the resonator is atomic-scale. Furthermore, we derive scaling limits for the bandwidth of dielectric antennas and describe a cylindrical mode which is unique in its ability to support extremely large bandwidths even when the particle size is deeply subwavelength. Finally, we show that higher Q antennas may couple more efficiently to an external load, but the optimal absorption cross-section depends only on the resonance frequency. (C) 2009 Optical Society of America
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