ORCID Profile
0000-0002-1350-3577
Current Organisation
Nanjing University of Post and Telecommunication.
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Publisher: IEEE
Date: 12-2012
Publisher: The Optical Society
Date: 16-01-2013
DOI: 10.1364/OE.21.001713
Publisher: IEEE
Date: 12-2011
Publisher: Springer Science and Business Media LLC
Date: 13-04-2014
Abstract: We propose the use of bimetallic non-alloyed nanoparticles (BNNPs) to improve the broadband optical absorption of thin amorphous silicon substrates. Isolated bimetallic NPs with uniform size distribution on glass and silicon are obtained by depositing a 10-nm Au film and annealing it at 600°C this is followed by an 8-nm Ag film annealed at 400°C. We experimentally demonstrate that the deposition of gold (Au)-silver (Ag) bimetallic non-alloyed NPs (BNNPs) on a thin amorphous silicon (a-Si) film increases the film's average absorption and forward scattering over a broad spectrum, thus significantly reducing its total reflection performance. Experimental results show that Au-Ag BNNPs fabricated on a glass substrate exhibit resonant peaks at 437 and 540 nm and a 14-fold increase in average forward scattering over the wavelength range of 300 to 1,100 nm in comparison with bare glass. When deposited on a 100-nm-thin a-Si film, Au-Ag BNNPs increase the average absorption and forward scattering by 19.6% and 95.9% compared to those values for Au NPs on thin a-Si and plain a-Si without MNPs, respectively, over the 300- to 1,100-nm range.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2013
Publisher: AIP Publishing
Date: 26-09-2011
DOI: 10.1063/1.3625937
Abstract: We report the experimental characterization of high-responsivity plasmonics-based GaAs metal-semiconductor-metal photodetector (MSM-PD) employing metal nano-gratings. Both the geometry and light absorption near the designed wavelength are theoretically and experimentally investigated. The measured photocurrent enhancement is 4-times in comparison with a conventional single-slit MSM-PD. We observe reduction in the responsivity as the bias voltage increases and the input light polarization varies. Our experimental results demonstrate the feasibility of developing a high-responsivity, low bias-voltage high-speed MSM-PD.
Publisher: Hindawi Limited
Date: 16-08-2011
DOI: 10.1155/2011/504530
Abstract: The finite difference time-domain (FDTD) method is used to simulate the light absorption enhancement in a plasmonic metal-semiconductor-metal photodetector (MSM-PD) structure employing a metal nanograting with phase shifts. The metal fingers of the MSM-PDs are etched at appropriate depths to maximize light absorption through plasmonic effects into a subwavelength aperture. We also analyse the nano-grating phase shift and groove profiles obtained typically in our experiments using focused ion beam milling and atomic force microscopy and discuss the dependency of light absorption enhancement on the nano-gratings phase shift and groove profiles inscribed into MSM-PDs. Our simulation results show that the nano-grating phase shift blue-shifts the wavelength at which the light absorption enhancement is maximum, and that the combined effects of the nano-grating groove shape and phase shift degrade the light absorption enhancement by up to 50%.
Publisher: IEEE
Date: 12-2010
Publisher: IEEE
Date: 08-2010
Publisher: IEEE
Date: 12-2010
Publisher: IEEE
Date: 07-8009
Publisher: Elsevier BV
Date: 03-2011
Publisher: Elsevier BV
Date: 05-2010
Publisher: Walter de Gruyter GmbH
Date: 07-07-2011
Abstract: We discuss the light absorption enhancement factor dependence on the design of nanogratings inscribed into metal-semiconductor-metal photodetector (MSM-PD) structures. These devices are optimized geometrically, leading to light absorption improvement through plasmon-assisted effects. Finite-difference time-domain (FDTD) simulation results show ~50 times light absorption enhancement for 850 nm light due to improved optical signal propagation through the nanogratings. Also, we show that the light absorption enhancement is strongly dependent on the nanograting shapes in MSM-PDs.
Publisher: IEEE
Date: 12-2009
Location: Korea, Republic of
No related grants have been discovered for Chee Leong Tan.