High-Temperature Solar Selective Absorbers Based on Interface Effects in Refractory Metals Coated With Transparent Conductive Oxides

2012 ◽  
Author(s):  
Makoto Shimizu ◽  
Fumitada Iguchi ◽  
Hiroo Yugami
Keyword(s):  
Electromagnetic Waves ◽  
Transparent Conductive Oxide ◽  
Infrared Region ◽  
Concentrated Solar Power ◽  
Solar Absorptance ◽  
Rigorous Coupled Wave Analysis ◽  
Spectral Selectivity ◽  
Working Principle ◽  
Pass Through ◽  
Rigorous Coupled Wave

At present, the utilization of thermal energy from sunlight has been widely adopted as the working principle of concentrated solar power (CSP) generation systems. In this research, we suggest a CSP technology based on the properties of transparent conductive oxide (TCO) thin films on metal substrates which is compatible with mass production of solar selective absorbers that can be utilized at high temperatures. Since the plasma wavelength of TCO materials is in the infrared region, electromagnetic waves with wavelengths longer than the plasma wavelength are reflected at the surface, whereas electromagnetic waves with shorter wavelengths pass through the surface layer and reach the substrate. In other words, a TCO thin film behaves as an antireflection film only in the transparency range of TCO coating. This phenomenon is demonstrated through numerical simulations based on rigorous coupled-wave analysis (RCWA). The prepared samples also show favorable spectral selectivity and satisfactory performance as solar selective absorbers, with a solar absorptance of 0.76, a thermal emittance of 0.12 at 800°C and a spectral selectivity of 6.5 at 800°C.

Application of Transparent Conductive Oxides Films for High-Temperature Solar Selective Absorbers

2014 ◽  
Author(s):  
Makoto Shimizu ◽  
Mari Suzuki ◽  
Asaka Kohiyama ◽  
Fumitada Iguchi ◽  
Hiroo Yugami
Keyword(s):  
Electromagnetic Wave ◽  
Mass Production ◽  
Transparent Conductive Oxide ◽  
Infrared Region ◽  
Metal Substrate ◽  
Concentrated Solar Power ◽  
Solar Absorptance ◽  
Coated Metal ◽  
Conductive Oxide ◽  
Working Principle

At present, the utilization of thermal energy from sunlight has been widely adopted as the working principle of concentrated solar power (CSP) generation systems. In this research, we suggest a CSP technology based on the properties of transparent conductive oxide (TCO) films on metal substrates which is compatible with mass production of solar selective absorbers that can be utilized at high temperatures. TCO material has plasma wavelength in infrared region. Therefore the electromagnetic wave with shorter wavelength than plasma wavelength goes through the material, while the electromagnetic wave with longer wavelength is reflected on the surface. By coating metal surface with a TCO film, interference is occurred in transparent wavelength range of TCO. Therefore, solar energy is highly absorbed, though thermal radiation from the absorber is suppressed. The optical property of fabricated TCO coated metal is well consistent with the simulated property. It is revealed that the performance of the absorber is improved by fabricating microstructures on the metal substrate. Thermal stability is confirmed at 700°C in vacuum for 3 hours. Solar absorptance and hemispherical emittance of the fabricated absorber are 0.82 and 0.17, respectively, which is comparable to that of commercialized absorbers.

Measurement of Coherent Thermal Emission From Subwavelength Grating Structures by the Excitation of Magnetic Polaritons

2012 ◽  
Author(s):  
L. P. Wang ◽  
Z. M. Zhang
Keyword(s):  
Elevated Temperatures ◽  
Thermal Emission ◽  
Infrared Region ◽  
Radiative Properties ◽  
Scattering Rate ◽  
Rigorous Coupled Wave Analysis ◽  
Space Cooling ◽  
Dielectric Spacer ◽  
Magnetic Polaritons ◽  
Rigorous Coupled Wave

Tailoring radiative properties such as spectral control of thermal emission is beneficial in many applications such as space cooling and energy harvesting. The effect of magnetic polaritons (MPs) on spectral modulation has been analyzed previously and shown to exhibit omnidirectional behaviors when magnetic polaritons are excited in metallic grating structures with a dielectric spacer on a metallic film. The present work provides an experimental demonstration of coherent thermal emission from such a microstructure in the infrared region at both room and elevated temperatures. Samples with different patterns are fabricated to study the geometric effect on the MPs. The emittance at elevated temperatures is directly measured using a home-built emissometer, while the room-temperature emittance is indirectly obtained from the reflectance measurements. The rigorous coupled-wave analysis and the LC model are employed to elucidate the mechanisms, by incorporating the Drude model with a temperature-dependent scattering rate.

Spectral Features of an Omnidirectional Narrowband Emitter

2012 ◽  
Vol 134 (10) ◽  
Author(s):  
Yutao Zhang ◽  
Yimin Xuan
Keyword(s):  
Incident Angle ◽  
Structural Parameters ◽  
Infrared Region ◽  
Transverse Magnetic ◽  
Silver Layer ◽  
Spectral Features ◽  
Structured Surface ◽  
Rigorous Coupled Wave Analysis ◽  
Spectral Emittance ◽  
Rigorous Coupled Wave

A microscale-structured surface consisting of heavily doped silicon rectangle grating and slotted silver layer is studied for omnidirectional narrowband emitter. Numerical simulation is implemented to obtain spectral emittance in mid-infrared region (6–16 μm) for the transverse magnetic incidence by using the rigorous coupled-wave analysis (RCWA) method. The effects of structural parameters and incident angle on its spectral emittance are investigated. In virtue of the microcavity effect, an omnidirectional narrowband emitter is proposed. By selecting a group of structural parameters, its peak emittance reaches as high as 0.998, and the peak width Δλ/λ of the emittance peak is as narrow as 0.03 at the specified wavelength. The results reveal that our proposed structured surface has the nice spectral features of angular uniformity and wavelength-selective characteristic, which can be applied to design novel narrowband thermal emitters and detectors in the infrared region.

scholarly journals Исследование поглощения СВЧ излучения в сверхтонких проводящих пленках

2020 ◽  
Vol 90 (8) ◽  
pp. 1348
Author(s):  
В.В. Старостенко ◽  
В.Б. Орленсон ◽  
А.С. Мазинов ◽  
И.Ш. Фитаев
Keyword(s):  
Numerical Simulation ◽  
Electromagnetic Waves ◽  
Microwave Range ◽  
Wave Analysis ◽  
Conductive Films ◽  
Change Dynamics ◽  
Rigorous Coupled Wave Analysis ◽  
Electromagnetic Characteristics ◽  
Rigorous Coupled Wave ◽  
Nanometer Thickness

An interaction numerical simulation of the microwave range electromagnetic waves with nanometer thickness conductive films, which are approximated by homogeneous region and micro- or nanoparticle’s structures, is carried out. Using the rigorous coupled wave analysis, the optical coefficients change dynamics is studied from values characterize dielectric to values for uniform conductive films, and the influence of conductive islands size and distribution on the electromagnetic characteristics is analyzed.

scholarly journals Extraordinary Optical Transmission by Hybrid Phonon–Plasmon Polaritons Using hBN Embedded in Plasmonic Nanoslits

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1567
Author(s):  
Shinpei Ogawa ◽  
Shoichiro Fukushima ◽  
Masaaki Shimatani
Keyword(s):  
Optical Transmission ◽  
Hexagonal Boron Nitride ◽  
Incident Angle ◽  
Optical Filters ◽  
Extraordinary Optical Transmission ◽  
Light Manipulation ◽  
Rigorous Coupled Wave Analysis ◽  
Fabry Perot ◽  
Hyperbolic Dispersion ◽  
Rigorous Coupled Wave

Hexagonal boron nitride (hBN) exhibits natural hyperbolic dispersion in the infrared (IR) wavelength spectrum. In particular, the hybridization of its hyperbolic phonon polaritons (HPPs) and surface plasmon resonances (SPRs) induced by metallic nanostructures is expected to serve as a new platform for novel light manipulation. In this study, the transmission properties of embedded hBN in metallic one-dimensional (1D) nanoslits were theoretically investigated using a rigorous coupled wave analysis method. Extraordinary optical transmission (EOT) was observed in the type-II Reststrahlen band, which was attributed to the hybridization of HPPs in hBN and SPRs in 1D nanoslits. The calculated electric field distributions indicated that the unique Fabry–Pérot-like resonance was induced by the hybridization of HPPs and SPRs in an embedded hBN cavity. The trajectory of the confined light was a zigzag owing to the hyperbolicity of hBN, and its resonance number depended primarily on the aspect ratio of the 1D nanoslit. Such an EOT is also independent of the slit width and incident angle of light. These findings can not only assist in the development of improved strategies for the extreme confinement of IR light but may also be applied to ultrathin optical filters, advanced photodetectors, and optical devices.

Rigorous Coupled Wave Analysis of Surface Plasmon Resonance Sensor Based on Metallic Grating

2011 ◽  
Vol 211-212 ◽  
pp. 465-468
Author(s):  
De Wei Chen
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Diffraction Order ◽  
Wave Analysis ◽  
Metallic Grating ◽  
Rigorous Coupled Wave Analysis ◽  
Resonance Sensor ◽  
Rigorous Coupled Wave ◽  
Coupled Wave

Since the development almost a decade ago of the first biosensor based on surface plasmon resonance (SPR), the use of this technique has increased steadily. In this study, we theoretically investigated the sensing character of SPR sensor with reflection type metallic with Rigorous Coupled Wave Analysis (RCWA) method, and the mechanism is analyzed by the field distribution. It is found that the sensitivity of negative diffraction order, which goes higher quickly as the resonant angle increases, is much greater than that of positive diffraction order.

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