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Wavelength-band-tuning photodiodes by using various metallic nanoparticles
J D Hwang1, Y D Chan, T C Chou
1Department of Electrophysics, National Chiayi University, No. 300 Syuefu Rd., Chiayi City 60004, Taiwan, People's Republic of China.
Nanotechnology
|October 29, 2015
Summary
Metallic nanoparticles (NPs) on silicon photodiodes (PDs) enable wavelength-band tuning. Gold NPs create high-pass filters, silver NPs create low-pass filters, and bimetallic NPs create band-pass filters.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Silicon p-n junction photodiodes (PDs) are fundamental optoelectronic devices.
- Controlling the spectral response of PDs is crucial for various applications.
- Plasmonic effects of metallic nanoparticles (NPs) offer a route to tune optical properties.
Purpose of the Study:
- To demonstrate wavelength-band tuning of silicon photodiodes using different metallic nanoparticles.
- To investigate the plasmonic resonance effects of gold, silver, and bimetallic nanoparticles on photodiode spectral response.
- To achieve selective light filtering by engineering nanoparticle coatings.
Main Methods:
- Deposition of various metallic nanoparticles (gold, silver, gold/silver bimetallic) onto silicon p-n junction photodiodes.
- Characterization of the normalized spectra of the modified photodiodes.
- Analysis of extinction plots to determine plasmonic resonance wavelengths.
Main Results:
- Photodiodes coated with gold NPs exhibited high-wavelength pass characteristics.
- Photodiodes coated with silver NPs demonstrated low-wavelength pass characteristics.
- Photodiodes with gold/silver bimetallic NPs showed band-wavelength pass behavior (450–630 nm FWHM) due to constructive interference.
Conclusions:
- Metallic nanoparticles provide an effective method for tuning the wavelength-band response of silicon photodiodes.
- The specific type of metallic nanoparticle (Au, Ag, or Au/Ag) dictates the filtering behavior (high-pass, low-pass, or band-pass).
- Plasmonic resonance and electromagnetic field enhancement are the underlying mechanisms for the observed spectral tuning.
