Active metamaterial nearly perfect light absorbers: a review [Invited]

Hajian, Hodjat; Ghobadi, Amir; Bütün, Bayram; Özbay, Ekmel

doi:10.1364/josab.36.00f131

Cited by 56 publications

(37 citation statements)

References 202 publications

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“…The concept of metamaterials and metasurfaces has emerged as a promising route to engineer the light-matter interaction in nanostructure geometries [1][2][3][4][5][6][7]. Light confinement in subwavelength geometries has turned into one of the most intensively explored areas in recent years.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Semiconductor-Based Metasurface for Photoelectrochemical Water Splitting: Broadband Light Perfect Absorption with Dimensions Smaller than the Diffusion Length

Ghobadi

Karadaş

et al. 2019

Plasmonics

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In this paper, we demonstrate a highly efficient light trapping design that is made of a metal-oxide-semiconductor-semiconductor (nanograting/nanopatch) (MOSS g/p) four-layer design to absorb light in a broad wavelength regime in dimensions smaller than the hole diffusion length of the active layer. For this aim, we first adopt a modeling approach based on the transfer matrix method (TMM) to find out the absorption bandwidth (BW) limits of a simple hematite (α-Fe 2 O 3)-based metal-oxide-semiconductor (MOS) cavity design. Our modeling findings show that this design architecture can provide near-perfect absorption in shorter wavelengths. To extend the absorption toward longer wavelengths, a nanostructured semiconductor is placed on top of this MOS design. This nanostructure supports the Mie resonance and adds a new resonance in longer wavelengths without disrupting the lower wavelength absorption capability of MOS cavity. By this way, a polarization-insensitive absorption above 0.8 can be acquired up to λ=565 nm. Moreover, to have a better qualitative comparison, the water-splitting photocurrent of this design has been estimated. Our calculations show that a photocurrent as high as 10.6 mA cm −2 can be achieved with this design that is quite close to the theoretical limit of 12.5 mA cm −2 for hematite-based water-splitting photoanode. This paper proposes a design approach in which the superposition of cavity modes and Mie resonances can lead to a broadband, polarization-insensitive, and omnidirectional near-perfect light absorption in dimensions smaller than the carrier's diffusion length. This can be considered as a winning strategy to design highly efficient and ultrathin optoelectronic designs in a variety of applications including photoelectrochemical water splitting and photovoltaics.

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Section: Introductionmentioning

confidence: 99%

Highly Efficient Semiconductor-Based Metasurface for Photoelectrochemical Water Splitting: Broadband Light Perfect Absorption with Dimensions Smaller than the Diffusion Length

Ghobadi

Karadaş

et al. 2019

Plasmonics

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“…Aer implementing the proposed optical parameter extraction, a proof-of-concept study is carried out to demonstrate a device application using the optical parameters of the VO 2 lm, which we have revealed as a result of the experimental and the theoretical studies of the material and optical properties described above in detail. Our goal is to design and experimentally show a tunable device 60 at SWIR and MWIR wavelengths using "sample A" and its optical parameters. We also employ a planar and lithography-free device architecture to benet the ease of the fabrication.…”

Section: Resultsmentioning

confidence: 99%

Unveiling the optical parameters of vanadium dioxide in the phase transition region: a hybrid modeling approach

et al. 2020

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“…Some noticeable points regarding the absorption plots, shown in Fig. 5, can be highlighted here: (i) the metamaterial shows broad band AA with tunable characteristics; thus, the suggested designs here can find potential application as active metamaterial light absorbers; 46 (ii) the support of multiresonant absorption peaks make the structure beneficial for sensing applications; (iii) the appearance of the resonant absorption peaks inside type-II (40:1 , f (THz) , 50:1) and type-I (23:4 , f (THz) , 24:9) bands is an indication of the support of hybrid plasmonic-phononic modes of both hyperbolicity by the metamaterial. Note that the appearance of the nearly perfect absorption resonances observed in Fig.…”

Section: B Mid-infrared Tunable Asymmetric Light Transmission and Abmentioning

confidence: 89%

“…Having higher contrast and considerably broader operation range are the most advantageous characteristics of these devices compared to recently investigated ones. 41 The proposed designs in this paper can find potential applications such as actively tunable optical diodes, sensors, light absorbers, 46 and thermal emitters for the operation at MIR and FIR frequencies.…”

Section: Discussionmentioning

confidence: 99%

Tunable infrared asymmetric light transmission and absorption via graphene-hBN metamaterials

Hajian

Ghobadi

Serebryannikov

et al. 2019

Journal of Applied Physics

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We theoretically prove in this paper that using planar multilayer graphene-hexagonal boron nitride (hBN) metamaterials (GhMMs) can yield ultrabroadband and high-contrast asymmetric transmission (AT) and asymmetric absorption (AA) of light. The AA and AT features are obtained in the far-infrared (FIR) and mid-infrared (MIR) regions for normally incident light with transverse magnetic polarization. Here, the GhMMs are integrated with two asymmetric gratings of Ge and are composed of alternating multilayers of graphene (11 multilayers) and hBN layers (10 layers). Moreover, the total subwavelength thickness of the hybrid structures is about 3 μm, being less than half of the free-space wavelength up to nearly 50 THz. This approach-which is similar to the one introduced by Xu and Lezec [Nat. Commun. 5, 4141 (2014)] for a passive hyperbolic metamaterial operating in the visible range-is based on the excitation of high-β modes of the GhMM with different transmission characteristics. In addition to being ultrabroadband and high-contrast, AT and AA features of the proposed GhMMs can be actively tuned by varying the chemical potential of graphene. Furthermore, it is shown that an onoff switching of AT factor at FIR and selective tunability at MIR frequencies can be obtained via varying μ. Due to its subwavelength and planar configuration and active operation, these multilayer graphene-hBN metamaterials with AT and AA characteristics hold promise for integration with compact optical systems operating in the MIR and FIR ranges and are suitable for applications such as optical diodes, sensors, and thermal emitters.

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Active metamaterial nearly perfect light absorbers: a review [Invited]

Cited by 56 publications

References 202 publications

Highly Efficient Semiconductor-Based Metasurface for Photoelectrochemical Water Splitting: Broadband Light Perfect Absorption with Dimensions Smaller than the Diffusion Length

Highly Efficient Semiconductor-Based Metasurface for Photoelectrochemical Water Splitting: Broadband Light Perfect Absorption with Dimensions Smaller than the Diffusion Length

Unveiling the optical parameters of vanadium dioxide in the phase transition region: a hybrid modeling approach

Tunable infrared asymmetric light transmission and absorption via graphene-hBN metamaterials

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