Metal/dielectric/metal sandwich film for broadband reflection reduction

Jen, Yi Jun; Lakhtakia, Akhlesh; Lin, Mingli; Wang, Wei-Hao; Wu, Haijun; Liao, Hung

doi:10.1038/srep01672

Cited by 16 publications

(5 citation statements)

References 24 publications

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“…Sang-Hwan et al fabricated a 4-layer dielectric-metal-dielectric-metal structure, which showed 99.3% average absorbance in the visible spectrum 11 . Jen et al fabricated metal-dielectric-metal pillars on a glass substrate with an absorbance of 80% and 40% for light with a wavelength of 400 nm and 800 nm, respectively 12 .…”

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confidence: 99%

Black metal thin films by deposition on dielectric antireflective moth-eye nanostructures

Christiansen

Caringal

Clausen

et al. 2015

Sci Rep

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Although metals are commonly shiny and highly reflective, we here show that thin metal films appear black when deposited on a dielectric with antireflective moth-eye nanostructures. The nanostructures were tapered and close-packed, with heights in the range 300-600 nm, and a lateral, spatial frequency in the range 5–7 μm−1. A reflectance in the visible spectrum as low as 6%, and an absorbance of 90% was observed for an Al film of 100 nm thickness. Corresponding experiments on a planar film yielded 80% reflectance and 20% absorbance. The observed absorbance enhancement is attributed to a gradient effect causing the metal film to be antireflective, analogous to the mechanism in dielectrics and semiconductors. We find that the investigated nanostructures have too large spatial frequency to facilitate efficient coupling to the otherwise non-radiating surface plasmons. Applications for decoration and displays are discussed.

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confidence: 99%

Black metal thin films by deposition on dielectric antireflective moth-eye nanostructures

Christiansen

Caringal

Clausen

et al. 2015

Sci Rep

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“…Accomplished by an ARC on the front face of the solar cell [93], [94], this is a cost-effective way to increase the efficiency because coating techniques are highly developed in the optics industry [95]. Multilayered ARCs are being designed and tested towards broadband, polarization-insensitive, and omnidirectional reduction of reflection [96]- [98].…”

Section: Light-management Designsmentioning

confidence: 99%

Making Solar Cells a Reality in Every Home: Opportunities and Challenges for Photovoltaic Device Design

Singh

Alapatt

Lakhtakia

2013

IEEE J. Electron Devices Soc.

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Globally, the cumulative installed photovoltaic (PV) capacity has topped the 100-gigawatt (GW) milestone and is expected to reach 200 GW by the year 2015. More than 90% of the installed PV capacity employs bulk-silicon solar cells. Engineering problems that include thermal and optical challenges have not permitted the large-scale commercialization of concentration PV systems, lack of functional reliabilityand the concomitant lack of economic bankability-being a major barrier. For increasing the efficiency of single-junction cells beyond the Shockley-Queisser limit, several approaches based on concepts such as multiple exciton generation, carrier multiplication, hot-carrier extraction, etc., have been proposed; however, these do not seem to be commercially viable. Since both bulk-silicon and thin-film (amorphous silicon, cadmium telluride, and copper indium gallium selenide) solar cells remain as the only two commercially viable options for terrestrial PV applications, a multi-terminal multi-junction architecture appears promising for inexpensive PV electricity generation with efficiency exceeding the currently feasible 25%. The architecture exploits the present commercial silicon solar cells along with abundant and ultralow-cost materials such as Cu 2 O. With the availability of wellcontrolled manufacturing processes at the sub 2-nm length scale, it will become possible to manufacture ultra-high efficiency and ultra-low cost PV electricity generation modules based on silicon.

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“…In recent years, the research of electromagnetic (EM) metamaterials (MMs) has been increased rapidly. MMs have been designed and fabricated to perform novel properties, such as negative refractive index [1,2], electromagnetically induced transparency [3,4], super-lensing [5], perfect absorption [6] and cloaking [7]. One major advantage of MMs over natural materials is that their macroscopic parameters can be designed to have desired values.…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of metamaterial polarization converter with the reflection and transmission polarization conversion simultaneously

Chen

et al. 2019

J. Opt.

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In this paper, a metamaterial polarization converter which can transform linearly polarized (LP) wave into its orthogonal polarization in the microwave region is designed and realized for the simultaneous implementation of the reflection and transmission polarization conversion. The special polarization converter is composed of dielectric substrate sandwiched by the split-ring resonator and the slotted PEC ground. The simulation results demonstrate that the reflection cross-polarization of this converter has a significantly polarization conversion ratio (PCR) over 90% in the frequency bandwidths of 23.50-32.31 GHz, and the transmission cross-polarization of this converter has a high PCR over 95% at frequencies of 7.78 and 13.39 GHz for normal incident LP waves. The simulation results are in good agreement with the experimental ones. Furthermore, the property of reflection and transmission cross-polarization of this proposed converter is stable at low frequencies with incident angle up to 50°. The physical mechanisms of the proposed multifunction polarization converter can be elucidated by the electromagnetic resonant theory based on its current distribution. The proposed polarization converter can be functionalized by changing the parameters of the slotted PEC ground, which has a great potential to be used as a selective polarization filter.

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Metal/dielectric/metal sandwich film for broadband reflection reduction

Cited by 16 publications

References 24 publications

Black metal thin films by deposition on dielectric antireflective moth-eye nanostructures

Black metal thin films by deposition on dielectric antireflective moth-eye nanostructures

Making Solar Cells a Reality in Every Home: Opportunities and Challenges for Photovoltaic Device Design

Design and implementation of metamaterial polarization converter with the reflection and transmission polarization conversion simultaneously

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