Ms. Yao Sun Profile

Yao Sun

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Proceedings Article | 14 March 2016 Paper

CMOS-compatible polarization rotator design based on asymmetrical periodic loaded waveguide structure

Yao Sun, Winnie Ye

Proceedings Volume 9752, 97520A (2016) https://doi.org/10.1117/12.2211659

KEYWORDS: Polarization, Waveguides, Etching, Cladding, Scanning electron microscopy, Device simulation, Silica, Birefringence

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Silicon-on-insulator (SOI) technology has been a promising platform for photonic applications. However, the high index-contrast between silicon and the top cladding (SiO₂ or air) of the SOI waveguides makes the modal birefringence hard to control. Consequently, SOI based photonics integrated circuits (PICs) are in general highly polarization-sensitive, making polarization management important. In this paper, a polarization rotator (PR) design on the 220 nm SOI platform is demonstrated through numerical simulations and experiments. The demonstrated PR design is based on asymmetrical periodic loaded waveguide structures. The demonstrated design features compact device footprint and can be fabricated by CMOS compatible process. In addition, no special cladding is required to break the vertical symmetry of the waveguide. The design has shown promising performance over the C-band wavelengths (1530 nm-1565 nm) by simulations. However, the fabrication requirements are stringent for the design, thus the performance of the fabricated devices are limited by the current fabrication technology.

Proceedings Article | 25 March 2013 Paper

Improving photovoltaic devices using silver nanocubes

F. Hejazi, S. Ding, Y. Sun, A. Bottomley, A. Ianoul, W. Ye

Proceedings Volume 8620, 862004 (2013) https://doi.org/10.1117/12.2002024

KEYWORDS: Solar cells, Nanoparticles, Silver, Plasmonics, Particles, Spherical lenses, Silicon, Photovoltaics, Metals, Amorphous silicon

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We present a design of implementing plasmonic nanoparticles made from silver onto the surface of amorphous silicon based solar cells. When adding these silver nanoparticles we expect to see enhancements to the solar cells due to the plasmonic effects induced by the metal nanoparticles. The nanoparticles are used as subwavelength scattering elements to couple and trap light within the cell. In addition, the excited surface plasmon-polaritons promote a strong localized field enhancement which increases the cells ability to absorb light. Our choice of geometry of the nanoparticle is cubic rather than the traditional spherical geometry. We expect to see the cell perform better with the cubic shape due to the larger surface area it spans. We investigate the effects of these particles on to the performance of the solar cells, as well as introduce an intrinsic layer between the active p and n region creating a p-i-n solar cell configuration. We report the use of an FDTD simulator to characterize the optical performance of the solar cell. Both cubical and spherical nanoparticles made from silver were studied. Our simulations predict an overall increase of 67% (from 7.5% to 12.5) based on the p-i-n configuration with inclusion of the plasmonic particles onto the surface of the cells. Experimentally we verified the results by first fabricating a crystalline silicon-based solar cell with a p-n configuration and then placing the silver nanocubes onto the surface of the cell. An overall increase of about 28% was experimentally demonstrated (from 3.97% to 5.081%). We anticipate further increases with the p-i-n configuration.

Proceedings Article | 24 October 2012 Paper

Design of plasmonic enhanced silicon-based solar cells

F. Hejazi, S. Y. Ding, Y. Sun, A. Bottomley, A. Ianoul, W. Ye

Proceedings Volume 8412, 84121L (2012) https://doi.org/10.1117/12.2006549

KEYWORDS: Solar cells, Nanoparticles, Silicon, Spherical lenses, Silver, Plasmonics, Light scattering, Amorphous silicon, Particles, Thin film solar cells

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We report a novel plasmonic solar cell design implemented on an amorphous silicon platform. The enhancement of the scattering and trapping of the light is achieved by embedding nano-metallic cubic particles within the cell’s junction. Amorphous silicon cell with a thickness of 1200nm is used. The spectral absorption of the silicon cell is limited to wavelengths larger than 1.1 u. Our proposed solar cell has a p-i-n configuration, with the amorphous silicon as the photo-active layer. Silver cubic nanoparticles are embedded at different locations within the photoactive layers of the solar cell. With the use of an FDTD simulator, we are able to characterize the optical performance of the solar cell. Our results show that the plasmonic properties of the cubic nanoparticles are more attractive for sensing applications compared to the traditional spherical configuration. The geometry of the cubic nanoparticles enables control over plasmon resonances both in the resonant wavelength and the degree of field enhancement. This is done by improving the refractive-index sensitivity on a thin silicon film, as well as increasing the scattering and trapping of light. Our simulations predict that the silver metallic nanoparticles will enhance the solar cell efficiency, by optimizing the plasmonic properties of the silver nanocube monolayer. We have achieved a 67% increase (from 7.5% to 12.5%) in the cell’s efficiency by adding plasmonics to traditional amorphous p-i-n solar cell.

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