Unidirectional thermal radiation from a SiC metasurface

Inampudi, Sandeep; Cheng, Jierong; Salary, Mohammad Mahdi; Mosallaei, Hossein

doi:10.1364/josab.35.000039

Cited by 36 publications

(26 citation statements)

References 60 publications

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“…Moving beyond these initial demonstrations, greater control over emission directionality may be possible using phased array metasurface concepts [18][19][20] . For instance, phased-array lensed thermal emission has recently been theoretically demonstrated 17,21 . Such directed thermal emitters typically exploit a peaked LDOS and losses associated with surface waves.…”

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confidence: 99%

Unidirectional luminescence from InGaN/GaN quantum-well metasurfaces

et al. 2020

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III-Nitride light emitting diodes (LEDs) are the backbone of ubiquitous lighting and display applications. Imparting directional emission is an essential requirement for many LED implementations. Although optical packaging 1 , nano-patterning 2,3 and surface roughening 4 techniques can enhance LED extraction, directing the emitted light requires bulky optical components. Optical metasurfaces provide precise control over transmitted and reflected waveforms, suggesting a new route for directing light emission. However, it is difficult to adapt metasurface concepts for incoherent light emission, due to the lack of a phase-locking incident wave. In this Letter, we demonstrate metasurface-based design of InGaN/GaN quantum-well structures that generate narrow, unidirectional transmission and emission lobes at arbitrary engineered angles. We show that the directions and polarization of emission differ significantly from transmission, in agreement with an analytical Local Density of Optical States (LDOS) model. The results presented in this Letter open a new paradigm for exploiting metasurface functionality in light emitting devices. Light emitting diodes (LED) are rapidly enabling solid-state solutions to commercial lighting applications. Imparting unidirectionality to LEDs is a challenging, problem with a host of applications 5-7 awaiting a scalable solution. Directional emission is naturally observed in lasing systems, 13,14 where all of the resonators are emitting coherently. By modifying the local density

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confidence: 99%

Unidirectional luminescence from InGaN/GaN quantum-well metasurfaces

et al. 2020

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“…The angular response of the visible-transparent IR-emitting/absorbing metasurface is obtained by an in-house built Rigorous Coupled-Wave Analysis (RCWA) solver 69 . RCWA solver is a tailor-made solver for periodic arrays.…”

Section: Methodsmentioning

confidence: 99%

Adaptive Genetic Algorithm for Optical Metasurfaces Design

Jafar‐Zanjani

Inampudi

Mosallaei

2018

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204

116

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As optical metasurfaces become progressively ubiquitous, the expectations from them are becoming increasingly complex. The limited number of structural parameters in the conventional metasurface building blocks, and existing phase engineering rules do not completely support the growth rate of metasurface applications. In this paper, we present digitized-binary elements, as alternative high-dimensional building blocks, to accommodate the needs of complex-tailorable-multifunctional applications. To design these complicated platforms, we demonstrate adaptive genetic algorithm (AGA), as a powerful evolutionary optimizer, capable of handling such demanding design expectations. We solve four complex problems of high current interest to the optics community, namely, a binary-pattern plasmonic reflectarray with high tolerance to fabrication imperfections and high reflection efficiency for beam-steering purposes, a dual-beam aperiodic leaky-wave antenna, which diffracts TE and TM excitation waveguides modes to arbitrarily chosen directions, a compact birefringent all-dielectric metasurface with finer pixel resolution compared to canonical nano-antennas, and a visible-transparent infrared emitting/absorbing metasurface that shows high promise for solar-cell cooling applications, to showcase the advantages of the combination of binary-pattern metasurfaces and the AGA technique. Each of these novel applications encounters computational and fabrication challenges under conventional design methods, and is chosen carefully to highlight one of the unique advantages of the AGA technique. Finally, we show that large surplus datasets produced as by-products of the evolutionary optimizers can be employed as ingredients of the new-age computational algorithms, such as, machine learning and deep leaning. In doing so, we open a new gateway of predicting the solution to a problem in the fastest possible way based on statistical analysis of the datasets rather than researching the whole solution space.

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“…Likewise, window glass made of silicon dioxide (SiO 2 ) and most other conventional low-cost glasses have strong absorption bands in the mid-infrared spectral range, caused by the excitation of phononpolariton modes in these polar materials. [28][29][30] The transmittance spectrum of a window glass pane is plotted as thin gray line in Fig. 3 together with the corresponding spectrum for a polyethylene sheet (thick red line) to illustrate the differences in their infrared spectra within the atmospheric transparency window.…”

Section: Unique Optical Properties Of Polyethylene Fuel Applications mentioning

confidence: 99%