Thin-film, wide-angle, design-tunable, selective absorber from near UV to far infrared

Nath, Janardan; Maukonen, D.; Smith, Evan M.; Figueiredo, Pedro; Zummo, Guy; Panjwani, Deep; Peale, Robert E.; Boreman, Glenn D.; Cleary, Justin W.; Eyink, Kurt G.

doi:10.1117/12.2017958

Cited by 11 publications

(12 citation statements)

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“…These identifications were determined from the graphical intersection of the refractive index spectrum (λ) for SiO 2 and the linear curve for n(λ) given by Eqs. (4)-(6), as was done in [21]. Figure 2(c)-(d) compares the analytically and numerically calculated resonance wavelengths.…”

Section: Resultsmentioning

confidence: 94%

“…We present results for a far-IR absorber with a surface pattern comprising a periodic pattern of squares, which follows known near- [18,19], and mid-IR designs [20].There are few prior reports of periodic square (or rectangular patterns)designed for far-IR absorption beyond ~10 micron wavelengths [14,21].We observe multiple absorption bands, which are attributed to fundamental and harmonic resonances. Up to 95% absorption was achieved in the fundamental band at 53.5μm wavelength.…”

Section: Introductionmentioning

confidence: 87%

“…Aperiodically patterned metallic top layer, together with a middle dielectric spacer layer and a conducting base layer, create resonances that achieve frequency-selective absorption. Reported patterns include split ring resonators (SRR) [7][8][9][10][11][12][13][14][15][16], crosses [18], squares and rectangles [19][20][21]. The absorption band width, polarization dependence, and spectral line shape depend on design.…”

Section: Introductionmentioning

confidence: 97%

“…Thin Mas have been reported with polarization independent and omnidirectional absorption bands [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Typical Mas comprise 3 layers.…”

Section: Introductionmentioning

confidence: 99%

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Far-infrared absorber based on standing-wave resonances in metal-dielectric-metal cavity

et al. 2015

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Thin-film resonant absorbers for the far-IR spectral range were fabricated, characterized, and modeled. The 3-μm-thick structure comprises a periodic surface array of metal squares, a dielectric spacer and a metallic ground plane. Up to 95% absorption for the fundamental band at ~53.5μm wavelength (5.6 THz) is achieved experimentally. Absorption bands are independent of the structure period and only weakly dependent on polarization and incident angle. The results are well explained in terms of standing-wave resonances within individual metal-dielectric-metal cavities. The structure has application as a wavelength selective coating for far-IR bolometers.

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Far-infrared absorber based on standing-wave resonances in metal-dielectric-metal cavity

et al. 2015

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“…Independence on polarization and incidence angle have been demonstrated [11][12][13][14][15] . *janardan..nath@knights.ucf.edu Structured thin-film absorbers typically comprise 3 layers, namely a top surface metal with sub-wavelength patterning, a dielectric spacer, and a metal ground plane on suitable substrate [3][4][5][6][7][8][9][10][11][12][13][14][15] . Patterning is usually periodic and unit cells can have various geometries, e.g.…”

Section: Introductionmentioning

confidence: 99%

Infra-red spectral microscopy of standing-wave resonances in single metal-dielectric-metal thin-film cavity

Nath

Panjwani

Khalilzadeh-Rezaie

et al. 2015

Metamaterials, Metadevices, and Metasystems 2015

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Resonantly absorbing thin films comprising periodically sub-wavelength structured metal surface, dielectric spacer, and metal ground plane are a topic of current interest with important applications. These structures are frequently described as "metamaterials", where effective permittivity and permeability with dispersion near electric and magnetic resonances allow impedance matching to free space for maximum absorption. In this paper, we compare synchrotron-based infrared spectral microscopy of a single isolated unit cell and a periodic array, and we show that the resonances have little to do with periodicity. Instead, the observed absorption spectra of usual periodically structured thin films are best described as due to standing-wave resonances within each independent unit cell, rather than as due to effective optical constants of a metamaterial. The effect of having arrays of unit cells is mainly to strengthen the absorption by increasing the fill factor, and such arrays need not be periodic. Initial work toward applying the subject absorbers to room-temperature bolometer arrays is presented.

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Micro‐ and Nanostructured Surfaces for Selective Solar Absorption

Khodasevych

Wang

Mitchell

et al. 2015

Advanced Optical Materials

166

114

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Applications utilizing solar energy are being actively developed due to increasing demand for environmentally friendly and sustainable energy solutions. The sun is a source of tremendous energy spanning from ultraviolet to infrared wavelengths, with the maximum energy in the visible range, corresponding to a blackbody temperature of 5780 K. [ 1 ] It is estimated that the amount of solar energy reaching Earth's surface is enough to Effi cient absorption of solar radiation is desired for the renewable energy sector, such as solar thermophotovoltaics and solar thermal applications. In order to minimize thermal re-radiation, wavelength-selective devices are required. Absorbers with structured surfaces are attractive because they derive their electromagnetic properties to a greater extent from their geometry and to a lesser extent from the intrinsic properties of the constituent materials. Thus, they offer greater fl exibility in the design and control of absorber features and can be tailored to suit requirements. This article reviews various classes of patterned structures: photonic crystals, metal-dielectric-metal slab arrays, metamaterials, and nanostructures operating in the visible and infrared wavelength ranges. Operation requirements, design principles and underlying physical phenomena, material and temperature considerations, as well as fabrication methods are discussed. Recent progress in achieving various desirable absorber features, such as broadband and multiband operation, polarization and angle independence, fl exibility, and tunability is presented. Suggestions are also given regarding future research directions.

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Thin-film, wide-angle, design-tunable, selective absorber from near UV to far infrared

Cited by 11 publications

References 0 publications

Far-infrared absorber based on standing-wave resonances in metal-dielectric-metal cavity

Far-infrared absorber based on standing-wave resonances in metal-dielectric-metal cavity

Infra-red spectral microscopy of standing-wave resonances in single metal-dielectric-metal thin-film cavity

Micro‐ and Nanostructured Surfaces for Selective Solar Absorption

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