Optimized aperiodic multilayer structures for use as narrow-angular absorbers

Granier, Christopher H.; Afzal, Francis O.; Lorenzo, Simón; Reyes, Mario Pedraza; Dowling, Jonathan P.; Veronis, Georgios

doi:10.1063/1.4904905

Cited by 28 publications

(11 citation statements)

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“…2) in an effort to maximize the power emitted by the structure in the visible while maximizing its efficiency. We use a hybrid optimization method consisting of a micro-genetic global optimization algorithm [11][12][13][14][15][16][17], coupled to a local optimization algorithm [18,19], to determine the best dimensions for four-layer structures. The genetic algorithm is an iterative optimization procedure which starts with a randomly selected population of potential solutions and evolves toward improved solutions; once the population converges, the local optimization algorithm finds the local optimum.…”

Section: Resultsmentioning

confidence: 99%

Optimized aperiodic broadband visible absorbers

Granier

Lorenzo

You

et al. 2017

J. Opt.

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Abstract:We present optimized aperiodic structures for use as broadband thermal incandescent emitters which are capable of increasing the emittance by nearly a factor of two over the visible wavelength range when compared to bulk tungsten. These aperiodic multilayer structures are designed with alternating layers of tungsten and air or tungsten and silicon carbide on top of a tungsten substrate. We investigate the properties of these structures for use as lightbulb filaments. We find that these structures greatly enhance the emittance over the visible wavelength range, while also increasing the overall efficiency of the bulb and could lead to a decrease in incandescent lightbulb power consumption by nearly 50%.

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Section: Resultsmentioning

confidence: 99%

Optimized aperiodic broadband visible absorbers

Granier

Lorenzo

You

et al. 2017

J. Opt.

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“…While several approaches have been proposed to optimize the geometrical dimensions of multilayer photonic nanostructures, with a given material composition, very few works have considered simultaneously optimizing the material composition and dimensions of such nanostructures [5], [12]. Here, we use a hybrid optimization algorithm as a method to design optimal multilayer photonic structures.…”

Section: Theorymentioning

confidence: 99%

Optimized Multilayer Structures With Ultrabroadband Near-Perfect Absorption

et al. 2020

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We present aperiodic multilayer structures with ultrabroadband near-perfect absorption in the visible and near-infrared wavelength range. We use a hybrid optimization algorithm coupled with the transfer-matrix method, to optimize both the material composition and the layer thicknesses of the aperiodic multilayer structures that are composed of infinite slabs of material above a semi-infinite substrate. In order to achieve ultrabroadband nearperfect absorption, we consider a broad range of materials including dielectrics, metals, and semiconductors. The optimization algorithms previously used to design ultrabroadband near-perfect absorbers only optimized the layer thicknesses of structures with fixed material composition. In contrast, we find that our approach of simultaneously optimizing the material composition as well as the layer thicknesses leads to structures with broader near-perfect absorption. For an optimized eleven-layer structure the lower and upper absorption band edges are 400 nm and ∼3800 nm, respectively. In addition, we find that, even though the structures are optimized for normally incident light, the absorption is high in a broad angular range within the wavelength range of interest. We also explain the physical origin of ultrabroadband absorption in these structures. Our results will contribute to the development of a new generation of devices for solar photovoltaics, imaging, and photodetection.

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“…More specifically, this thesis made use of a microgenetic algorithm to avoid the problem of premature convergence, resulting in faster convergence to the near-optimal region [36,123,124]. Starting with a small population of random members, the microgenetic algorithm evolves and converges after a few generations.…”

Section: Genetic Algorithmmentioning

confidence: 99%

Aperiodic multilayer graphene based tunable and switchable thermal emitter at mid-infrared frequencies

Sharifi

Banadaki

Nezhad

et al. 2018

Journal of Applied Physics

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for the continuous support of my thesis. I would like to thank Dr. Georgios Veronis for his comments, patience, motivation, and immense knowledge. His guidance and attention to detail helped me in all the time of research and this thesis could not have been written without his supervision. I am truly indebted to Jon for his meticulous comments and encouragements, as well as his innovative approach to develop and widen my research from various perspectives. Not only a great mentor, he has been a true father whose kindness will forever be of immense value to me. I could not have imagined having better advisors and mentors for my M.Sc. study than Dr. Georgios Veronis and Dr. Jonathan P. Dowling. My sincere thanks also go to Dr. Theda Daniels-Race for her insightful comments and suggestions to improve the quality of my research. Last but not the least, I would like to thank my lovely husband for supporting me spiritually throughout my study and my life in general. Without a doubt, this accomplishment would have never been possible without his continuous support, unconditional love, and prayers. iv

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Optimized aperiodic multilayer structures for use as narrow-angular absorbers

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Cited by 28 publications

References 40 publications

Optimized aperiodic broadband visible absorbers

Optimized aperiodic broadband visible absorbers

Optimized Multilayer Structures With Ultrabroadband Near-Perfect Absorption

Aperiodic multilayer graphene based tunable and switchable thermal emitter at mid-infrared frequencies

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