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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
Published on: July 8, 2013
Plasmonic light harvesting for multicolor infrared thermal detection
Feilong Mao1, Jinjin Xie, Shiyi Xiao
1Institute of Advanced Materials, State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai, China.
Optics Express
|February 8, 2013
Summary
This study explores a novel plasmonic cavity for enhanced infrared light detection. Hybridized optical modes in the cavity significantly boost photon absorption for multicolor sensing applications.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Plasmonic cavities are crucial for manipulating light at the nanoscale.
- Understanding mode interactions is key to designing advanced optical devices.
- Semiconductor-filled plasmonic structures offer tunable optical properties.
Purpose of the Study:
- To investigate the optical properties of a novel plasmonic cavity.
- To identify and characterize different optical modes and their interactions.
- To demonstrate the potential for multicolor infrared light detection.
Main Methods:
- Combined experimental measurements and theoretical modeling.
- Fabrication of a plasmonic cavity with a perforated metal film, semiconductor spacer, and flat metal sheet.
- Spectroscopic analysis to identify surface plasmons and Fabry-Perot modes.
Main Results:
- Clearly identified propagating and localized surface plasmons, and Fabry-Perot modes.
- Observed hybridization of these modes, leading to tunable spectral properties.
- Demonstrated enhanced photon absorption for a two-color detector design (~42.8% at 15μm and ~46.2% at 10.2μm).
Conclusions:
- The designed plasmonic cavity exhibits hybridized eigenmodes with tunable spectral characteristics.
- The system shows significant potential for highly efficient multicolor infrared light detection.
- Spatially distinct field distributions of the hybridized modes enable targeted light absorption.
