Enhanced Light Trapping in Periodic Aluminum Nanorod Arrays as Cavity Resonator

2013 ◽  
Vol 1566 ◽  
Author(s):  
Rosure B. Abdulrahman ◽  
Arif S. Alagoz ◽  
Tansel Karabacak
Keyword(s):  
Field Distribution ◽  
Light Trapping ◽  
Incident Light ◽  
Fdtd Method ◽  
Cavity Resonator ◽  
Nanorod Arrays ◽  
Resonant Modes ◽  
Average Reflectance ◽  
Em Field ◽  
Al Thin Film

ABSTRACTMetallic nanostructures can exhibit different optical properties compared to bulk materials mainly depending on their shape, size, and separation. We present the results of an optical modeling study on ordered arrays of aluminum (Al) nanorods with a hexagonal periodic geometry placed on an Al thin film. We used a finite-difference time-domain (FDTD) method to solve the Maxwell's equations and predict the reflectance of the nanorod arrays. The thickness of the base Al film was set to 100 nm, and diameter, height and nanorod center-to-center periodicity were varied. Incident light in the FDTD simulations was an EM-circular polarized plane wave and reflectance profiles were calculated in the wavelength range 200-1800 nm. In addition, we calculated spatial electric field intensity distributions around the nanorods for wavelengths 300, 500, and 700 nm. Our results show that average reflectance of Al nanorods can drop down to as low as ∼50%, which is significantly lower than the ∼90% reflectance of conventional flat Al film at similar wavelengths. In addition to the overall decrease in reflectance, Al nanorod arrays manifest multiple resonant modes (higher-order modes) indicated by several dips in their reflectance spectrums (i.e. multiple attenuation peaks in their absorption profiles). Positions of these dips in the reflectance spectrum and spatial EM field distribution vary with nanorod height and diameter. Multiple reflectance peaks are explained by cavity resonator effects. Spatial EM field distribution profiles indicate enhanced light trapping among the nanorods, which can be useful especially in optoelectronic and solar cell applications.

Distribution of Electromagnetic Field and Energy Flux in the Thin Film Solar Cell with Silver Nano-Disk Array

2013 ◽  
Vol 669 ◽  
pp. 194-203
Author(s):  
Hong Zhou ◽  
Xiao Ping Huang ◽  
Lei Zhong ◽  
Sheng Kang Ji ◽  
Yan Pang ◽  
...  
Keyword(s):  
Thin Film ◽  
Electromagnetic Field ◽  
Solar Cell ◽  
Field Distribution ◽  
Energy Flux ◽  
Thin Film Solar Cell ◽  
Incident Light ◽  
Fdtd Method ◽  
Absorption Enhancement ◽  
Electromagnetic Field Distribution

We simulate and calculate numerically the electromagnetic field and energy flux in single crystal silicon thin film solar cell coated with silver nano-disk square array by using the finite-difference time-domain (FDTD) method. Because of the surface plasmon resonance (SPR) of silver nano array, the electromagnetic field is redistributed and enhanced in the solar cell. The simulation results show that the electromagnetic field distribution and corresponding energy flux component depend on the nano array and the structure of absorbed layer in solar cell. The wavelength of the incident light relative to the nano array determine the profile of the electric field around the nano array. The electromagnetic field distribution in thin film is determined by the internal structure of solar cell. For different incident wavelengths, the electromagnetic field distribution in solar cell will changes. The energy flux named as Poynting vector also changes with the incident wavelength. To investigate the absorption of the solar cell, the normalized absorbed power at different wavelengths is calculated. Based on the SPR effect, the solar cell exhibts absorption enhancement sharply at a certain wavelength.

scholarly journals 2D MoS2 Encapsulated Silicon Nanopillar Array with High-Performance Light Trapping Obtained by Direct CVD Process

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 267
Author(s):  
Minyu Bai ◽  
Zhuoman Wang ◽  
Jijie Zhao ◽  
Shuai Wen ◽  
Peiru Zhang ◽  
...  
Keyword(s):  
Silicon Substrate ◽  
High Performance ◽  
Low Cost ◽  
Light Trapping ◽  
Incident Light ◽  
Single Layer ◽  
Chemical Vapor ◽  
Optoelectronic Device ◽  
Planar Silicon ◽  
Shortwave Infrared

Weak absorption remains a vital factor that limits the application of two-dimensional (2D) materials due to the atomic thickness of those materials. In this work, a direct chemical vapor deposition (CVD) process was applied to achieve 2D MoS2 encapsulation onto the silicon nanopillar array substrate (NPAS). Single-layer 2D MoS2 monocrystal sheets were obtained, and the percentage of the encapsulated surface of NPAS was up to 80%. The reflection and transmittance of incident light of our 2D MoS2-encapsulated silicon substrate within visible to shortwave infrared were significantly reduced compared with the counterpart planar silicon substrate, leading to effective light trapping in NPAS. The proposed method provides a method of conformal deposition upon NPAS that combines the advantages of both 2D MoS2 and its substrate. Furthermore, the method is feasible and low-cost, providing a promising process for high-performance optoelectronic device development.

A Study of the Simulation of a Light Trapping Module for Increasing the Absorption Efficiency of Solar Cells

2013 ◽  
Vol 437 ◽  
pp. 198-201
Author(s):  
Wang Lin Liu ◽  
Guan Yu Lin ◽  
Hsiharng Yang
Keyword(s):  
Solar Cell ◽  
Light Trapping ◽  
Incident Light ◽  
Absorption Efficiency ◽  
Optical Channel ◽  
Back Side ◽  
Transparent Substrate ◽  
Channel Opening ◽  
Pass Through ◽  
Light Beams

This study proposed a light trapping module to improve the light path in a solar cell in order to increase its light absorption efficiency. The microlens on a transparent substrate concentrates incident light into several light beams, which it leads into the optical channel on the back side. The optical channel is designed by coating highly reflective metals on the same transparent substrate, then an optical channel opening is made at the light beam focus so the light beams can pass through the optical channel and irradiate the solar cell. The light reflected by the solar cell is reflected again by the metal surface to the upper film of the solar cell, thus, increasing the absorption efficiency of the solar cell and reducing the film thickness of the solar cell to obtain better electrical properties. In this simulation the refractive index of the microlens was set as 1.43, the optical channel was 25 μm and the spacing was 0.27 mm, thus, the simulated absorption efficiency reached over 80%. The feasibility of this study was thus proved.

Effects of nanorod’s scattering cross-section on the light-trapping of subwavelength nanorod arrays

Optik ◽  
2020 ◽  
Vol 203 ◽  
pp. 163992
Author(s):  
Xiaojian Yu ◽  
Chaogang Lou ◽  
Hao Zhang ◽  
Xiaodan Huang ◽  
Hua Yang
Keyword(s):  
Cross Section ◽  
Light Trapping ◽  
Scattering Cross Section ◽  
Nanorod Arrays ◽  
Scattering Cross

Guided-mode resonance and field enhancement in semiconductor nanorod arrays

2015 ◽  
Vol 1728 ◽  
Author(s):  
W. X. Yu ◽  
Y. Yi
Keyword(s):  
Field Enhancement ◽  
Nanorod Array ◽  
Optical Signal ◽  
Future Application ◽  
Nanorod Arrays ◽  
Resonance Modes ◽  
Guided Mode ◽  
Raman Enhancement ◽  
Guided Mode Resonance ◽  
Em Field

ABSTRACTGuided mode resonance was numerically demonstrated in the tapered silicon nitride nanorod arrays on glass substrate. Finite difference time domain technique was employed to investigate the detailed light-matter interaction dynamics and the generation of resonance at femtoseconds. Enhanced electromagnetic (EM) field intensity with enhancement factor of 200∼250 could be achieved. This highly concentrated electromagnetic field could be extended to the nanorod array tips and substrate for higher order resonance modes, which allows future application of this transverse propagating field in optical signal amplification, like fluorescence or Raman enhancement.

scholarly journals Optical Transmission Properties and Electric Field Distribution of Interacting 2D Silver Nanorod Arrays

2008 ◽  
Vol 18 (7) ◽  
pp. 1075-1079 ◽  
Author(s):  
Paul R. Evans ◽  
René Kullock ◽  
William R. Hendren ◽  
Ron Atkinson ◽  
Robert J. Pollard ◽  
...  
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Optical Transmission ◽  
Electric Field Distribution ◽  
Nanorod Arrays ◽  
Transmission Properties

A Hybrid Partial Coherence and Geometry Optics Model of Radiative Property on Coated Rough Surfaces

2013 ◽  
Vol 135 (9) ◽  
Author(s):  
Jun Qiu ◽  
Yuan Ting Wu ◽  
Zhifeng Huang ◽  
Pei-Feng Hsu ◽  
Lin-Hua Liu ◽  
...  
Keyword(s):  
Coating Thickness ◽  
Rough Surfaces ◽  
Scattered Light ◽  
Incident Light ◽  
Fdtd Method ◽  
Partial Coherence ◽  
Radiative Properties ◽  
Wave Number ◽  
Heating Process ◽  
Coherence Effect

Thermal and optical engineering applications of electromagnetic wave scattering from rough surfaces include temperature measurement, radiation heating process, etc. Most of the surfaces have random roughness and are often with coating material different from the substrate. However, the understanding of radiative properties of coated rough surfaces is not well addressed at this point. This paper presented a novel hybrid partial coherence and geometry optics (HPCGO) model to improve the generic geometry optics (GO) prediction by incorporating a previously developed partial coherence reflectance equation. In this way, HPCGO expands the applicable region of GO model and largely reduces the computation time of integrating different wavelength results in the regular hybrid model that considers coherence effect only. In this study, the HPCGO model is first compared with the more rigorous Maxwell equations solvers, the finite-difference time-domain (FDTD) method, and integral equation (IE) method. Then, the HPCGO model is applied to study the coherent effect of directional-hemispherical reflectance from coated rough surfaces. It is found the roughness of coated rough surface can cause partially coherent or noncoherent scattered light even if the incident light source is coherent. It also shows the reflected electromagnetic wave's coherence effect reduces with increased coating thickness and surface roughness, besides the previously recognized incident wave-number bandwidth. The effect of reduce coherence in scattered wave is quantified. Finally a regime map, even limited in the roughness and coating thickness dimensionless parameter ranges, provides the region of validity of the HPCGO model.

scholarly journals Ultra-Low-Reflective, Self-Cleaning Surface by Fabrication Dual-Scale Hierarchical Optical Structures on Silicon

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1541
Author(s):  
Miaomiao Duan ◽  
Jingjun Wu ◽  
Yubin Zhang ◽  
Ning Zhang ◽  
Jun Chen ◽  
...  
Keyword(s):  
Incident Light ◽  
Fdtd Method ◽  
Silicon Substrates ◽  
Light Emitting ◽  
Reflective Surface ◽  
Silicon Devices ◽  
Scale Structures ◽  
Self Cleaning ◽  
Difference Time ◽  
Dual Scale

An integrated functional anti-reflective surface is of great significance for optical and optoelectronic devices. Hence, its preparation has attracted great attention from many researchers. This study combined wet alkaline etching approaches and reactive ion etching (RIE) techniques to create a dual-scale hierarchical anti-reflective surface on silicon substrates. The effect of RIE time on surface morphology and optical performance was investigated using multiple characterization forms. The optimal parameters for the fabrication of dual-scale structures by the composite etching process were explored. The silicon surface with a dual-scale structure indicated excellent anti-reflective properties (minimum reflectivity of 0.9%) in the 300 to 1100 nm wavelength range. In addition, the ultra-low reflection characteristic of the surface remained prominent at incident light angles up to 60°. The simulated spectra using the finite difference time domain (FDTD) method agreed with the experimental results. Superhydrophobicity and self-cleaning were also attractive properties of the surface. The functionally integrated surface enables silicon devices to have broad application prospects in solar cells, light emitting diodes (LEDs), photoelectric detectors, and outdoor equipment.

Sign in / Sign up

Export Citation Format

Share Document