Spectrally Controlled Thermal Radiation Based on Surface Microstructures for High-efficiency Solar Thermophotovoltaic System

Kohiyama, Asaka; Shimizu, Makoto; Kobayashi, Hiroaki; Iguchi, Fumitada; Yugami, Hiroo

doi:10.1016/j.egypro.2014.10.205

Cited by 15 publications

(5 citation statements)

References 8 publications

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“…An array of a W 2D PhC and the tailored thermal emis- sion is shown in Figure 8C. Also, Kohiyama et al proposed a closed-end surface microcavity array to improve the emission quality factor and hence suppress thermalization losses [75]. Three-dimensional PhCs are also proposed as efficient thermal emitters, either being an allmetallic structure, as first proposed in [61,76], or with a metal-coated silicon or carbon scaffold for improved thermal stability [70,77].…”

Section: Phcs and Metamaterials Thermal Emittersmentioning

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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Section: Phcs and Metamaterials Thermal Emittersmentioning

confidence: 99%

Solar thermophotovoltaics: reshaping the solar spectrum

et al. 2016

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“…These usually consist of an array of metallic or dielectric elements that are configured to possess a predefined set of optical properties. Recent advances in the field of metamaterials and metasurfaces have benefited several applications ranging from sensing [1][2][3] to energy harvesting [4][5][6][7] and thermal management. [8][9][10][11] In recent years, there has been growing interest in using metamaterials for storing information.…”

Section: Introductionmentioning

confidence: 99%

Experimental Implementation of Metasurfaces for Secure Multi‐Channel Image Encryption in the Infrared

Audhkhasi

Lien

Povinelli

2023

Advanced Optical Materials

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The ability to tailor light–matter interactions using artificially engineered materials has opened up new avenues for secure data storage and communication. This work presents an experimental investigation of metasurfaces for secure, multi‐channel image encryption in the infrared (IR). The proposed metasurfaces consist of an array of pixels, each designed to produce a wavelength‐ and polarization‐dependent IR absorptivity. A basis set of pixels is designed for encrypting images of arbitrary resolution on a given number of wavelength and polarization channels. These pixels are fabricated, and their spectral response is experimentally measured using Fourier transform infrared spectroscopy. The measured data is used to emulate the encryption and decryption of binary and 8‐bit grayscale images. Finally, the security of the encryption scheme proposed in this work is evaluated by performing statistical analyses on the image data stored on different channels. The results presented in this study suggest intriguing possibilities for the development of encrypted tagging technologies in the infrared and thus have implications for secure object identification and anti‐counterfeiting.

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“…These are artificially engineered materials that consist of an array of metallic or dielectric elements that can be configured to realize a wide range of optical functionalities within a small form factor. [1] Owing to their ability to manipulate optical waves in the spatial and spectral domain, such devices have benefited a wide variety of applications ranging from sensing [2][3][4] to energy harvesting [5][6][7][8] and thermal management. [9][10][11][12] Recently, there has been growing interest in using metasurfaces for data storage.…”

Section: Introductionmentioning

confidence: 99%

Full Spectral Image Encryption in the Infrared using an Electrically Reconfigurable Metasurface and a Matched Detector

Audhkhasi,

Povinelli

2023

Advanced Photonics Research

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The ability of metasurfaces to manipulate optical waves in the spatial and spectral domain provides new avenues for secure data storage. In this work, an encryption system consisting of an electrically tunable metasurface and a matched detector is presented for secure encryption of grayscale images in the 8–12 μm wavelength range. In the proposed scheme, the encrypted image corresponds to the spatially varying thermal intensity of the metasurface as captured by its matched detector. In contrast to previous metasurface‐based encryption schemes, the current approach leverages the full spectral response of the associated photonic devices to achieve secure encryption while circumventing the need for an increased device size. Using examples of single‐ and multi‐image encryption, it is shown that the optical properties of either the metasurface or matched detector alone do not reveal any meaningful information about the encrypted image, thereby validating the security of the proposed scheme. The electrical tunability of the metasurface provides additional security as the image can only be retrieved by operating it at a predefined voltage level. The results presented in this study provide intriguing possibilities for the development of compact and secure object tagging and anti‐counterfeiting applications in the infrared.

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Spectrally Controlled Thermal Radiation Based on Surface Microstructures for High-efficiency Solar Thermophotovoltaic System

Cited by 15 publications

References 8 publications

Solar thermophotovoltaics: reshaping the solar spectrum

Solar thermophotovoltaics: reshaping the solar spectrum

Experimental Implementation of Metasurfaces for Secure Multi‐Channel Image Encryption in the Infrared

Full Spectral Image Encryption in the Infrared using an Electrically Reconfigurable Metasurface and a Matched Detector

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