Design of an ultra-broadband super absorbing plasmonic metamaterials

Résultats de recherche: Contribution dans un livre/un catalogue/un rapport/dans les actes d'une conférenceChapitre

Résumé

In recent years, the need for thin films structures that absorb electromagnetic radiation over a broadband spectrum has been shown to be paramount in solar harvesting for photovoltaic cells, thermal emitters or infrared detectors systems operating in 1–3μm and in 3–5μm atmospheric windows used for both civilian and military applications. Recently, Cui et al. (Nano Lett 12:1443–7, 2012), Lobet et al. (Opt. Expr 22:12678–12690, 2014) presented saw-toothed anisotropic metamaterials acting as thin film broadband absorbers in the infrared regime using alternating gold and dielectric layers. The full absorption normalized width at half the maximum was Δτ/τ = 86% over the 3–5:5μm wavelength range. In the present work, we design a metamaterial absorber (MMA) showing averaged absorptivity of. (Ā) = 93:3 %, over a much broader spectrum, between 200 nm and 5:2μm. This MMA is made of a periodical array of truncated pyramids with a squared base disposed in air (Fig. 55.1). The truncated pyramids deposited on a semi-infinite gold substrate consist of 20 layers a stratified medium with alternating Au (thickness t<inf>Au</inf>= 15 nm) and Ge (thickness t<inf>Ge</inf>= 35 nm) slices whose lateral side linearly reduces from L D 600 nm at the basis to l D 150 nm at the top of the pyramid. A stack of twenty layers is used in the present MMA resulting to a 1μm high thin structure. The truncated pyramids are deposited on a 200 nm thick gold film. A SiO<inf>2</inf>matrix with a refractive index of n<inf>SiO<inf>2</inf></inf>= 1:44, acts as semi-infinite substrate. The periodicity is set to 800 nm. Gold and germanium permittivities are described using tabulated data (Potter, Germanium (Ge). In: Palik (ed) Handbook of optical constants of solids. Academic, Orlando, 1985; Johnson and Christy, Phys Rev B 6:4370–4379, 1972). Numerical results were obtained with a rigorous coupled-wave analysis (RCWA) method, which is perfectly suited for periodic systems. Since the gold layer is sufficiently thick, no transmission.(T = 0) occurs, and the absorption (A) is directly deduced from reflectivity (R) calculations using A = 1 – R. We distinguish three parts in the absorption spectrum: a first part ranging from 200 nm to 2:0μm (UV, visible, NIR, MIR) with an averaged absorption of (Ā<inf>I</inf>) = 92:1 %, a second part encompassing wavelengths between 2:0 and 2:7μm (MIR) showing a weaker absorption of. (Ā<inf>II</inf>) = 80:1% and, finally, a third part from 2.7 to 5:2μm (MIR) with an absorption of (Ā<inf>III</inf>) = 97:8% (Lobet et al., Opt. Expr 22:12678–12690, 2014). The absorption mechanism is attributed to the excitation of stationary surface plasmon (SSP) at the interface between metal and dielectric layers. Each layer of the pyramid contributes to several narrow absorption peaks and, since SSP are shape and size dependent, the associations of different sizes of the layers sum up constructively, boosting absorption in a broadband manner. Modelling of the absorption of individual layers was conducted using a Discrete Dipole Approximation DDSCAT code (Draine and Flatau, J Opt Soc Am A 11:1491, 1994) and enabled to identify modes optically active in individual systems. Those modes correspond to excitation of localized surface plasmons modes (Lobet et al., Opt. Expr 22:12678–12690, 2014). We identified plasmonic modes in absorption spectra of square parallelepipeds of thickness t<inf>Au</inf>= 15 nm and length L = 150, 300, 450, and 600 nm embedded in a Ge dielectric medium. Those peaks correspond to dipolar, sextupolar and octopolar modes, according to field map distributions. We show the mode resonance wavelength shift Δλ with respect to the resonance of the smallest system (L = 150 nm) as a function of the aspect ratio R = L/t which is consistent with the dispersion relation of surface plasmon polariton of infinite thin film of Au (Lobet et al., Opt. Expr 22:12678–12690, 2014). This proves that, when L increases, longer wavelengths are absorbed, which explains the broadband spectrum. The ultra-broadband characteristics of the MMA, extending from visible to mid-IR ranges, give huge versatility for the design of various devices.

langue originaleAnglais
titreNano-Structures for Optics and Photonics: Optical Strategies for Enhancing Sensing, Imaging, Communication and Energy Conversion
EditeurSpringer Netherlands
Pages527-529
Nombre de pages3
ISBN (imprimé)9789401791335, 9789401791328
Les DOIs
étatPublié - 1 janv. 2015

Empreinte digitale

Metamaterials
Germanium
Gold
broadband
pyramids
Wavelength
absorbers
gold
Thin films
germanium
Absorption spectra
Gallopamil
Plasmons
Military applications
Optical constants
Infrared detectors
Photovoltaic cells
Time varying systems
wavelengths
Substrates

Citer ceci

Lobet, M., Deparis, O., & Henrard, L. (2015). Design of an ultra-broadband super absorbing plasmonic metamaterials. Dans Nano-Structures for Optics and Photonics: Optical Strategies for Enhancing Sensing, Imaging, Communication and Energy Conversion (p. 527-529). Springer Netherlands. https://doi.org/10.1007/978-94-017-9133-5_55
Lobet, Michaël ; Deparis, Olivier ; Henrard, Luc. / Design of an ultra-broadband super absorbing plasmonic metamaterials. Nano-Structures for Optics and Photonics: Optical Strategies for Enhancing Sensing, Imaging, Communication and Energy Conversion. Springer Netherlands, 2015. p. 527-529
@inbook{f09de42a2e4a4f10aaf9ff718f7a5dc3,
title = "Design of an ultra-broadband super absorbing plasmonic metamaterials",
abstract = "In recent years, the need for thin films structures that absorb electromagnetic radiation over a broadband spectrum has been shown to be paramount in solar harvesting for photovoltaic cells, thermal emitters or infrared detectors systems operating in 1–3μm and in 3–5μm atmospheric windows used for both civilian and military applications. Recently, Cui et al. (Nano Lett 12:1443–7, 2012), Lobet et al. (Opt. Expr 22:12678–12690, 2014) presented saw-toothed anisotropic metamaterials acting as thin film broadband absorbers in the infrared regime using alternating gold and dielectric layers. The full absorption normalized width at half the maximum was Δτ/τ = 86{\%} over the 3–5:5μm wavelength range. In the present work, we design a metamaterial absorber (MMA) showing averaged absorptivity of. (Ā) = 93:3 {\%}, over a much broader spectrum, between 200 nm and 5:2μm. This MMA is made of a periodical array of truncated pyramids with a squared base disposed in air (Fig. 55.1). The truncated pyramids deposited on a semi-infinite gold substrate consist of 20 layers a stratified medium with alternating Au (thickness tAu= 15 nm) and Ge (thickness tGe= 35 nm) slices whose lateral side linearly reduces from L D 600 nm at the basis to l D 150 nm at the top of the pyramid. A stack of twenty layers is used in the present MMA resulting to a 1μm high thin structure. The truncated pyramids are deposited on a 200 nm thick gold film. A SiO2matrix with a refractive index of nSiO2= 1:44, acts as semi-infinite substrate. The periodicity is set to 800 nm. Gold and germanium permittivities are described using tabulated data (Potter, Germanium (Ge). In: Palik (ed) Handbook of optical constants of solids. Academic, Orlando, 1985; Johnson and Christy, Phys Rev B 6:4370–4379, 1972). Numerical results were obtained with a rigorous coupled-wave analysis (RCWA) method, which is perfectly suited for periodic systems. Since the gold layer is sufficiently thick, no transmission.(T = 0) occurs, and the absorption (A) is directly deduced from reflectivity (R) calculations using A = 1 – R. We distinguish three parts in the absorption spectrum: a first part ranging from 200 nm to 2:0μm (UV, visible, NIR, MIR) with an averaged absorption of (ĀI) = 92:1 {\%}, a second part encompassing wavelengths between 2:0 and 2:7μm (MIR) showing a weaker absorption of. (ĀII) = 80:1{\%} and, finally, a third part from 2.7 to 5:2μm (MIR) with an absorption of (ĀIII) = 97:8{\%} (Lobet et al., Opt. Expr 22:12678–12690, 2014). The absorption mechanism is attributed to the excitation of stationary surface plasmon (SSP) at the interface between metal and dielectric layers. Each layer of the pyramid contributes to several narrow absorption peaks and, since SSP are shape and size dependent, the associations of different sizes of the layers sum up constructively, boosting absorption in a broadband manner. Modelling of the absorption of individual layers was conducted using a Discrete Dipole Approximation DDSCAT code (Draine and Flatau, J Opt Soc Am A 11:1491, 1994) and enabled to identify modes optically active in individual systems. Those modes correspond to excitation of localized surface plasmons modes (Lobet et al., Opt. Expr 22:12678–12690, 2014). We identified plasmonic modes in absorption spectra of square parallelepipeds of thickness tAu= 15 nm and length L = 150, 300, 450, and 600 nm embedded in a Ge dielectric medium. Those peaks correspond to dipolar, sextupolar and octopolar modes, according to field map distributions. We show the mode resonance wavelength shift Δλ with respect to the resonance of the smallest system (L = 150 nm) as a function of the aspect ratio R = L/t which is consistent with the dispersion relation of surface plasmon polariton of infinite thin film of Au (Lobet et al., Opt. Expr 22:12678–12690, 2014). This proves that, when L increases, longer wavelengths are absorbed, which explains the broadband spectrum. The ultra-broadband characteristics of the MMA, extending from visible to mid-IR ranges, give huge versatility for the design of various devices.",
keywords = "Metamaterials, Nanostructures, Plasmonics, Subwavelength structures",
author = "Micha{\"e}l Lobet and Olivier Deparis and Luc Henrard",
year = "2015",
month = "1",
day = "1",
doi = "10.1007/978-94-017-9133-5_55",
language = "English",
isbn = "9789401791335",
pages = "527--529",
booktitle = "Nano-Structures for Optics and Photonics: Optical Strategies for Enhancing Sensing, Imaging, Communication and Energy Conversion",
publisher = "Springer Netherlands",
address = "Netherlands",

}

Lobet, M, Deparis, O & Henrard, L 2015, Design of an ultra-broadband super absorbing plasmonic metamaterials. Dans Nano-Structures for Optics and Photonics: Optical Strategies for Enhancing Sensing, Imaging, Communication and Energy Conversion. Springer Netherlands, p. 527-529. https://doi.org/10.1007/978-94-017-9133-5_55

Design of an ultra-broadband super absorbing plasmonic metamaterials. / Lobet, Michaël; Deparis, Olivier; Henrard, Luc.

Nano-Structures for Optics and Photonics: Optical Strategies for Enhancing Sensing, Imaging, Communication and Energy Conversion. Springer Netherlands, 2015. p. 527-529.

Résultats de recherche: Contribution dans un livre/un catalogue/un rapport/dans les actes d'une conférenceChapitre

TY - CHAP

T1 - Design of an ultra-broadband super absorbing plasmonic metamaterials

AU - Lobet, Michaël

AU - Deparis, Olivier

AU - Henrard, Luc

PY - 2015/1/1

Y1 - 2015/1/1

N2 - In recent years, the need for thin films structures that absorb electromagnetic radiation over a broadband spectrum has been shown to be paramount in solar harvesting for photovoltaic cells, thermal emitters or infrared detectors systems operating in 1–3μm and in 3–5μm atmospheric windows used for both civilian and military applications. Recently, Cui et al. (Nano Lett 12:1443–7, 2012), Lobet et al. (Opt. Expr 22:12678–12690, 2014) presented saw-toothed anisotropic metamaterials acting as thin film broadband absorbers in the infrared regime using alternating gold and dielectric layers. The full absorption normalized width at half the maximum was Δτ/τ = 86% over the 3–5:5μm wavelength range. In the present work, we design a metamaterial absorber (MMA) showing averaged absorptivity of. (Ā) = 93:3 %, over a much broader spectrum, between 200 nm and 5:2μm. This MMA is made of a periodical array of truncated pyramids with a squared base disposed in air (Fig. 55.1). The truncated pyramids deposited on a semi-infinite gold substrate consist of 20 layers a stratified medium with alternating Au (thickness tAu= 15 nm) and Ge (thickness tGe= 35 nm) slices whose lateral side linearly reduces from L D 600 nm at the basis to l D 150 nm at the top of the pyramid. A stack of twenty layers is used in the present MMA resulting to a 1μm high thin structure. The truncated pyramids are deposited on a 200 nm thick gold film. A SiO2matrix with a refractive index of nSiO2= 1:44, acts as semi-infinite substrate. The periodicity is set to 800 nm. Gold and germanium permittivities are described using tabulated data (Potter, Germanium (Ge). In: Palik (ed) Handbook of optical constants of solids. Academic, Orlando, 1985; Johnson and Christy, Phys Rev B 6:4370–4379, 1972). Numerical results were obtained with a rigorous coupled-wave analysis (RCWA) method, which is perfectly suited for periodic systems. Since the gold layer is sufficiently thick, no transmission.(T = 0) occurs, and the absorption (A) is directly deduced from reflectivity (R) calculations using A = 1 – R. We distinguish three parts in the absorption spectrum: a first part ranging from 200 nm to 2:0μm (UV, visible, NIR, MIR) with an averaged absorption of (ĀI) = 92:1 %, a second part encompassing wavelengths between 2:0 and 2:7μm (MIR) showing a weaker absorption of. (ĀII) = 80:1% and, finally, a third part from 2.7 to 5:2μm (MIR) with an absorption of (ĀIII) = 97:8% (Lobet et al., Opt. Expr 22:12678–12690, 2014). The absorption mechanism is attributed to the excitation of stationary surface plasmon (SSP) at the interface between metal and dielectric layers. Each layer of the pyramid contributes to several narrow absorption peaks and, since SSP are shape and size dependent, the associations of different sizes of the layers sum up constructively, boosting absorption in a broadband manner. Modelling of the absorption of individual layers was conducted using a Discrete Dipole Approximation DDSCAT code (Draine and Flatau, J Opt Soc Am A 11:1491, 1994) and enabled to identify modes optically active in individual systems. Those modes correspond to excitation of localized surface plasmons modes (Lobet et al., Opt. Expr 22:12678–12690, 2014). We identified plasmonic modes in absorption spectra of square parallelepipeds of thickness tAu= 15 nm and length L = 150, 300, 450, and 600 nm embedded in a Ge dielectric medium. Those peaks correspond to dipolar, sextupolar and octopolar modes, according to field map distributions. We show the mode resonance wavelength shift Δλ with respect to the resonance of the smallest system (L = 150 nm) as a function of the aspect ratio R = L/t which is consistent with the dispersion relation of surface plasmon polariton of infinite thin film of Au (Lobet et al., Opt. Expr 22:12678–12690, 2014). This proves that, when L increases, longer wavelengths are absorbed, which explains the broadband spectrum. The ultra-broadband characteristics of the MMA, extending from visible to mid-IR ranges, give huge versatility for the design of various devices.

AB - In recent years, the need for thin films structures that absorb electromagnetic radiation over a broadband spectrum has been shown to be paramount in solar harvesting for photovoltaic cells, thermal emitters or infrared detectors systems operating in 1–3μm and in 3–5μm atmospheric windows used for both civilian and military applications. Recently, Cui et al. (Nano Lett 12:1443–7, 2012), Lobet et al. (Opt. Expr 22:12678–12690, 2014) presented saw-toothed anisotropic metamaterials acting as thin film broadband absorbers in the infrared regime using alternating gold and dielectric layers. The full absorption normalized width at half the maximum was Δτ/τ = 86% over the 3–5:5μm wavelength range. In the present work, we design a metamaterial absorber (MMA) showing averaged absorptivity of. (Ā) = 93:3 %, over a much broader spectrum, between 200 nm and 5:2μm. This MMA is made of a periodical array of truncated pyramids with a squared base disposed in air (Fig. 55.1). The truncated pyramids deposited on a semi-infinite gold substrate consist of 20 layers a stratified medium with alternating Au (thickness tAu= 15 nm) and Ge (thickness tGe= 35 nm) slices whose lateral side linearly reduces from L D 600 nm at the basis to l D 150 nm at the top of the pyramid. A stack of twenty layers is used in the present MMA resulting to a 1μm high thin structure. The truncated pyramids are deposited on a 200 nm thick gold film. A SiO2matrix with a refractive index of nSiO2= 1:44, acts as semi-infinite substrate. The periodicity is set to 800 nm. Gold and germanium permittivities are described using tabulated data (Potter, Germanium (Ge). In: Palik (ed) Handbook of optical constants of solids. Academic, Orlando, 1985; Johnson and Christy, Phys Rev B 6:4370–4379, 1972). Numerical results were obtained with a rigorous coupled-wave analysis (RCWA) method, which is perfectly suited for periodic systems. Since the gold layer is sufficiently thick, no transmission.(T = 0) occurs, and the absorption (A) is directly deduced from reflectivity (R) calculations using A = 1 – R. We distinguish three parts in the absorption spectrum: a first part ranging from 200 nm to 2:0μm (UV, visible, NIR, MIR) with an averaged absorption of (ĀI) = 92:1 %, a second part encompassing wavelengths between 2:0 and 2:7μm (MIR) showing a weaker absorption of. (ĀII) = 80:1% and, finally, a third part from 2.7 to 5:2μm (MIR) with an absorption of (ĀIII) = 97:8% (Lobet et al., Opt. Expr 22:12678–12690, 2014). The absorption mechanism is attributed to the excitation of stationary surface plasmon (SSP) at the interface between metal and dielectric layers. Each layer of the pyramid contributes to several narrow absorption peaks and, since SSP are shape and size dependent, the associations of different sizes of the layers sum up constructively, boosting absorption in a broadband manner. Modelling of the absorption of individual layers was conducted using a Discrete Dipole Approximation DDSCAT code (Draine and Flatau, J Opt Soc Am A 11:1491, 1994) and enabled to identify modes optically active in individual systems. Those modes correspond to excitation of localized surface plasmons modes (Lobet et al., Opt. Expr 22:12678–12690, 2014). We identified plasmonic modes in absorption spectra of square parallelepipeds of thickness tAu= 15 nm and length L = 150, 300, 450, and 600 nm embedded in a Ge dielectric medium. Those peaks correspond to dipolar, sextupolar and octopolar modes, according to field map distributions. We show the mode resonance wavelength shift Δλ with respect to the resonance of the smallest system (L = 150 nm) as a function of the aspect ratio R = L/t which is consistent with the dispersion relation of surface plasmon polariton of infinite thin film of Au (Lobet et al., Opt. Expr 22:12678–12690, 2014). This proves that, when L increases, longer wavelengths are absorbed, which explains the broadband spectrum. The ultra-broadband characteristics of the MMA, extending from visible to mid-IR ranges, give huge versatility for the design of various devices.

KW - Metamaterials

KW - Nanostructures

KW - Plasmonics

KW - Subwavelength structures

UR - http://www.scopus.com/inward/record.url?scp=84943273515&partnerID=8YFLogxK

U2 - 10.1007/978-94-017-9133-5_55

DO - 10.1007/978-94-017-9133-5_55

M3 - Chapter

SN - 9789401791335

SN - 9789401791328

SP - 527

EP - 529

BT - Nano-Structures for Optics and Photonics: Optical Strategies for Enhancing Sensing, Imaging, Communication and Energy Conversion

PB - Springer Netherlands

ER -

Lobet M, Deparis O, Henrard L. Design of an ultra-broadband super absorbing plasmonic metamaterials. Dans Nano-Structures for Optics and Photonics: Optical Strategies for Enhancing Sensing, Imaging, Communication and Energy Conversion. Springer Netherlands. 2015. p. 527-529 https://doi.org/10.1007/978-94-017-9133-5_55