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Plasmon-assisted transparency in metal-dielectric microspheres
Charles Rohde1, Keisuke Hasegawa, Miriam Deutsch
1Department of Physics, University of Oregon, Eugene, OR 97403, USA.
Optics Letters
|March 16, 2007
Summary
We theoretically analyzed light scattering from coupled metal-dielectric microspheres. The study reveals tunable optical transparency and suppressed scattering near avoided crossings, similar to electromagnetically induced transparency.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Light scattering phenomena are crucial in understanding light-matter interactions.
- Metal-dielectric nanostructures offer unique optical properties due to surface plasmon resonances.
Purpose of the Study:
- To theoretically investigate light scattering from a novel layered metal-dielectric microsphere system.
- To explore the emergence of tunable optical transparency and its underlying mechanisms.
Main Methods:
- Theoretical analysis of coupled spherical resonators.
- Solving for system modes and calculating scattering cross sections.
- Investigating phenomena near avoided crossings in the system's spectrum.
Main Results:
- Demonstrated dramatic suppression of scattering cross section near an avoided crossing.
- Observed tunable optical transparency, analogous to electromagnetically induced transparency.
- Associated the transparency with a large group delay and flat azimuthal dispersion.
Conclusions:
- The layered metal-dielectric microsphere system exhibits controllable optical transparency.
- This phenomenon has potential applications in optical devices requiring precise light manipulation and delay.
