Tailoring thermal emission via<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Q</mml:mi></mml:mrow></mml:math>matching of photonic crystal resonances

Ghebrebrhan, Michael; Bermel, Peter; Yeng, YiXiang; Čelanović, Ivan; Soljačić, Marin; Joannopoulos, John D.

doi:10.1103/physreva.83.033810

Cited by 96 publications

(76 citation statements)

References 35 publications

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“…[23][24][25] cut-off frequency, the design of the cavities is also based on Q-matching formalism where maximum absorption occurs when the radiative Q rad and the absorption Q abs are equal. [22,26] The measured absorption spectrum shown in MDPhC layer agrees well with experiment, but diverges for , where transmission through the metal layer can no longer be assumed to be . At these frequencies, the silicon substrate absorbs the transmitted light.…”

supporting

confidence: 67%

“…Along with the cut-off frequency, the design of the cavities is also based on Q-matching formalism where maximum absorption occurs when the radiative Q rad and the absorption Q abs are equal. [22,26] The measured absorption spectrum shown in Figure 2(a), demonstrates the broadband absorption of the MDPhC across the majority of the solar spectrum along with a steep cut-off frequency. A UV-Vis-near-IR Cary 500i spherical diffuse reflectance measurement accessory was used to obtain the total absolute absorption spectrum ( of the MDPhC, MAPhC, and flat ruthenium at an incidence of 3° with unpolarized light.…”

mentioning

confidence: 99%

“…Since the cut-off frequency is dependent on the geometry of the cavities, the absorption spectrum can be tuned by simply modifying the radius and depth of the cavities. [2,22] Photos and SEM images of the device are shown in Figure 1(c)-(f) where the multilayered structure was fabricated using the sidewall lithography technique across a 6" wafer (see supporting information). [23][24][25] An 80 nm thick layer of ruthenium is used as the metal, which was deposited via atomic layer deposition (ALD) for conformal deposition purposes.…”

mentioning

confidence: 99%

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Enabling Ideal Selective Solar Absorption with 2D Metallic Dielectric Photonic Crystals

Chou¹,

Yeng²,

Lee³

et al. 2014

Advanced Materials

128

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The selective absorption of sunlight plays a critical role in solar-thermophotovoltaic (STPV) energy conversion by tailoring both the absorption and emission spectrums for efficient solar-thermal-electrical energy conversion. [1][2][3][4][5][6][7] By selectively absorbing solar energy while suppressing long wavelength emission, optimal solar-thermal energy conversion can be achieved. In practical STPV systems, selective absorbers must simultaneously contain optical, manufacturing, and reliability properties. Previous efforts have typically focused only on a subset of these requirements. In this communication, we present our solution which contains all of the ideal properties of a selective absorber for large-scale and efficient solar energy conversion.The effective absorption of solar energy requires selective absorption across the solar spectrum, high temperature reliability, omnidirectional absorption, and wafer-scale fabrication 2 for mass scalability. Recent developments of metal based selective absorbers have demonstrated 1D, 2D, and 3D metallic photonic crystal structures capable of tailoring the absorption spectrum. [2,[8][9][10][11][12][13][14] One dimensional metal dielectric stacks have demonstrated promising solar absorbing properties but are unstable at temperatures greater than approximately 600°C. [13] In particular, two-dimensional metallic air photonic crystals (MAPhC) have been shown to selectively absorb light in the near-IR via cavity modes and withstand high temperatures greater than 1000°C; however, the acceptance angle is limited to ±30°, and the absorption in the visible spectrum is limited due to diffraction. [2,11,15] Metamaterial and plasmonic based absorbers have demonstrated wide angle absorption due to their subwavelength periodic structures; however high temperature stability and wafer-scalefabrication have yet to be shown. [1,3,[16][17][18][19] Here we present our 2D metallic dielectric photonic crystal (MDPhC) structure, which simultaneously demonstrates broadband (visible to near-IR) absorption, omnidirectional absorption, wafer-scale fabrication, and high temperature robustness.[20] The wafer-scale fabricated MDPhC has a measured absorption of 85% for photon energies and an absorption below 10% for . Angled measurements show existence of the cavity modes for angles up to 70° from normal. Furnace tests at 1000°C for 24 hours show a robust optical performance due to its fully encapsulated design which helps to retain the metal cavity shapes at high temperatures. [21] Finite-difference time-domain (FDTD) and rigorous coupled wave analysis (RCWA) based simulations indicate that the broadband absorption is due to a high density of hybrid cavity and surface plasmon modes overlaped with an anti-reflection coating (ARC).A schematic image of the MDPhC is shown in Figure 1(a) and (b). The MDPhC utilizes cut-off frequencies of cavity modes to tailor the absorption. Since the cut-off frequency is dependent on the geometry of the cavities, the absorption spectrum can be tuned by simply modif...

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confidence: 67%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Enabling Ideal Selective Solar Absorption with 2D Metallic Dielectric Photonic Crystals

Chou¹,

Yeng²,

Lee³

et al. 2014

Advanced Materials

128

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show abstract

“…An example of a Si/SiO 2 1D PhC is shown in Figure 8A and 8B. Resonant emission in metallic 2D PhCs can be engineered to enhance useful emission via Q-matching [56]. An array of a W 2D PhC and the tailored thermal emis- sion is shown in Figure 8C.…”

Section: Phcs and Metamaterials Thermal Emittersmentioning

confidence: 99%

“…The absorption cutoff can be tuned by adjusting the dimensions of the periodic structure, and thus shifting the photonic band gap. Furthermore, PhCs can also enhance absorption via quality factor matching (Qmatching) [29,50,55,56]. According to coupled mode theory [57], a cavity with a resonance frequency ω 0 and absorption quality factor Q abs , and coupled to a radiating mode with a quality factor Q rad has an absorption spectrum given by the following:…”

Section: Phc Selective Solar Absorbersmentioning

confidence: 99%

Solar thermophotovoltaics: reshaping the solar spectrum

et al. 2016

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Abstract:Recently, there has been increasing interest in utilizing solar thermophotovoltaics (STPV) to convert sunlight into electricity, given their potential to exceed the Shockley-Queisser limit. Encouragingly, there have also been several recent demonstrations of improved systemlevel efficiency as high as 6.2%. In this work, we review prior work in the field, with particular emphasis on the role of several key principles in their experimental operation, performance, and reliability. In particular, for the problem of designing selective solar absorbers, we consider the trade-off between solar absorption and thermal losses, particularly radiative and convective mechanisms. For the selective thermal emitters, we consider the tradeoff between emission at critical wavelengths and parasitic losses. Then for the thermophotovoltaic (TPV) diodes, we consider the trade-off between increasing the potential short-circuit current, and maintaining a reasonable opencircuit voltage. This treatment parallels the historic development of the field, but also connects early insights with recent developments in adjacent fields. With these various components connecting in multiple ways, a system-level end-to-end modeling approach is necessary for a comprehensive understanding and appropriate improvement of STPV systems. This approach will ultimately allow researchers to design STPV systems capable of exceeding recently demonstrated efficiency values.

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Micro‐ and Nanostructured Surfaces for Selective Solar Absorption

Khodasevych

Wang

Mitchell

et al. 2015

Advanced Optical Materials

169

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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Tailoring thermal emission viaQmatching of photonic crystal resonances

Cited by 96 publications

References 35 publications

Enabling Ideal Selective Solar Absorption with 2D Metallic Dielectric Photonic Crystals

Enabling Ideal Selective Solar Absorption with 2D Metallic Dielectric Photonic Crystals

Solar thermophotovoltaics: reshaping the solar spectrum

Micro‐ and Nanostructured Surfaces for Selective Solar Absorption

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