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Published on: August 15, 2019
Surface plasmon-enhanced nanopillar photodetectors
Pradeep Senanayake1, Chung-Hong Hung, Joshua Shapiro
1Department of Electrical Engineering and California Nano-Systems Institute, University of California Los Angeles, Los Angeles, California 90095, United States. pradeeps@ee.ucla.edu
Nano Letters
|November 15, 2011
Summary
We developed nanopillar-based plasmon-enhanced photodetectors (NP-PEPDs) for near-infrared light. This novel design uses a 2D plasmonic crystal to create electric field "hot spots" for enhanced light detection.
Area of Science:
- Photonics
- Plasmonics
- Nanotechnology
Background:
- Plasmon-enhanced photodetectors (PEPDs) offer improved light sensitivity.
- Near-infrared (NIR) detection is crucial for various applications.
- Existing PEPDs face challenges in efficiency and spectral control.
Purpose of the Study:
- To demonstrate novel nanopillar-based plasmon-enhanced photodetectors (NP-PEPDs) for the NIR spectral regime.
- To investigate the role of 2D plasmonic crystals and nanohole arrays in enhancing photodetector performance.
- To explore designs for improved optical coupling efficiency.
Main Methods:
- Fabrication of subwavelength elongated nanoholes in a metal surface, self-aligned to nanopillar (NP) arrays.
- Excitation of Surface Plasmon Polariton Bloch waves (SPP-BWs) using a metal nanohole array.
- Characterization of photodetector responsivity and wavelength dependence.
Main Results:
- Achieved a responsivity of 0.28 A/W at 1100 nm with a reverse bias of -5 V.
- Demonstrated that NP periodicity dictates peak responsivity wavelength.
- Showcased polarization-dependent coupling due to nanohole asymmetry.
Conclusions:
- The developed NP-PEPDs show significant potential for NIR detection.
- The 2D plasmonic crystal design enables efficient light coupling and enhanced responsivity.
- This technology could advance plasmonically enhanced focal plane arrays and plasmonic photovoltaics.
