Metallic photonic crystals with strong broadband absorption at optical frequencies over wide angular range

Veronis, Georgios; Dutton, R.W.; Fan, Shanhui

doi:10.1063/1.1889248

Cited by 59 publications

(49 citation statements)

References 33 publications

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“…Due to the periodic nature of the problem, only one period needs to be simulated by using the proper boundary conditions. In order to study angular dependence, we employ Floquet-Bloch conditions on the cell boundaries [20]. The top and bottom part of the computational domain is terminated with absorbing Perfectly Matched Layer regions.…”

Section: Methodsmentioning

confidence: 99%

Angle insensitive enhancement of organic solar cells using metallic gratings

Abass

Shen

Bienstman

et al. 2011

Journal of Applied Physics

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We explore the optical enhancement of organic photovoltaic cells by incorporating a metallic grating as the back contact. We numerically demonstrate a strongly enhanced light absorption exploiting a complex interplay between multiple electromagnetic wave phenomena, among which Surface Plasmon Polariton (SPP) resonances, waveguide mode resonances, Fabry-Perot modes and scattering. We focus on a triangular grating structure and describe the particular opportunities to obtain a good angular performance. In addition we introduce a novel multiperiodic geometry that incorporates multiple types of SPP resonances. Our triangular structure shows an increased absorption of 15.6% with the AM1.5G spectrum in the 300-800nm wavelength range. For the multiperiodic grating case a significant further increase to 20.7% is shown. * Electronic address: aimi.abass@elis.ugent.be 1

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Section: Methodsmentioning

confidence: 99%

Angle insensitive enhancement of organic solar cells using metallic gratings

Abass

Shen

Bienstman

et al. 2011

Journal of Applied Physics

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“…It is known that the frequency dependence of metals over the optical frequency range is described by the Drude model [12][13][14][15].…”

Section: Drude Model For Metals At Optical Frequenciesmentioning

confidence: 99%

A Maxwell Garnett Model for Dielectric Mixtures Containing Conducting Particles at Optical Frequencies

Koledintseva¹,

DuBroff²,

Schwartz³

2006

PIER

114

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Abstract-Mathematical modeling of composites made of a dielectric base and randomly oriented metal inclusions is considered. Different sources of frequency-dependent metal conductivity at optical frequencies are taken into account. These include the skin-effect, dimensional (length-size) resonance of metal particles, and the Drude model. Also, the mean free path of electrons in metals can be smaller than the characteristic sizes of nanoparticles, and this leads to the decrease in conductivity of the metal inclusions. These effects are incorporated in the Maxwell Garnett mixing formulation, and give degrees of freedom for forming desirable optical frequency characteristics of composite media containing conducting particles.

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“…4,5,8,9,11,18 Photonic-crystals (PCs) have been researched for absorption control both as back-reflector components [19][20][21] and directly as the absorptive medium. [22][23][24][25][26] The latter cases seem promising schemes for one-step absorption platforms where the lossy photonic crystal could facilitate the incoupling of all impinging light and at the same time would mold the coupled mode in a fashion that enables all light to get absorbed. This one-step process is highly attractive, but also particular challenging, even more so for thin subwavelength structures.…”

Section: Introductionmentioning

confidence: 99%

Compact photonic-crystal superabsorbers from strongly absorbing media

Devarapu

Foteinopoulou

2013

Journal of Applied Physics

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We present a route to near-perfect absorption in compact photonic-crystal (PC) structures constructed from strongly absorbing media that are typically highly reflective in bulk form. Our analysis suggests that the key underlying mechanism in such PC superabsorbers is the existence of a PC-band-edge reflectionless condition. Although the latter is by default uncharacteristic in photonic crystals, we propose here a clear recipe on how such condition can be met by tuning the structural characteristics of one-dimensional lossy PC structures. Based on this recipe, we constructed a realizable three-layer SiC-BaF 2 -SiC PC operating within the Reststrahlen band of SiC. We demonstrate near-perfect absorption in this prototype of total thickness smaller than k=3, where more than 90% of the impinging light is absorbed by the top deep-subwavelength layer of thickness $k=1100. We believe our study will inspire new photonic-crystal-based designs for extreme absorption harnessing across the electromagnetic spectrum. V C 2013 AIP Publishing LLC.

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Metallic photonic crystals with strong broadband absorption at optical frequencies over wide angular range

Cited by 59 publications

References 33 publications

Angle insensitive enhancement of organic solar cells using metallic gratings

Angle insensitive enhancement of organic solar cells using metallic gratings

A Maxwell Garnett Model for Dielectric Mixtures Containing Conducting Particles at Optical Frequencies

Compact photonic-crystal superabsorbers from strongly absorbing media

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