Refining method for the design of multilayer stacks

Demichelis, Francesca; Ferrari, Giorgio; Minetti-Mezzetti, E.; Perotto, W.

doi:10.1364/ao.21.001854

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…of a thin film. 2,3,4,5 Reflectance and transmittance of an optical filter can be calculated by using the 2x2 matrix of the multilayer structure surrounded by two substrates. 3 For this study, a Matlab code computer program, 6 which calculates reflectance and transmittance, was prepared using the matrix representation method of a multilayer structure.…”

Section: Sensitivity Analysismentioning

confidence: 99%

“…Sensitivity is often related to errors that are induced during the manufacturing process, as a result of human or instrumental error, as one loses control of precision. 4,7 Hence, it is useful to study the sensitivity factor, as it has a significant effect on the final spectral performance of the manufactured thin film. The optical thin film parameters that are prone to error are the physical thickness and the refractive index.…”

Section: Sensitivity Analysismentioning

confidence: 99%

“…Using Beumeister's sensitivity analysis method, it is possible to analyse the sensitivity effect of only one layer at a time. 4,8 One-layer-at-a-time variation involves a partial derivative of reflectance. The partial derivative of the matrix with respect to quarter wave thickness can be evaluated as in Thelen 8 .…”

Section: Sensitivity Analysismentioning

confidence: 99%

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Sensitivity versus polarisation in multilayer optical thin film design

Ejigu

Lacquet

2012

S Afr J Sci

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Section: Sensitivity Analysismentioning

confidence: 99%

Section: Sensitivity Analysismentioning

confidence: 99%

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Sensitivity versus polarisation in multilayer optical thin film design

Ejigu

Lacquet

2012

S Afr J Sci

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“…Specifically, the genetic algorithm was successfully used in the design of multilayered cylindrical structures with super-scattering or cloaking performance [14,15]. When an initial design is available, refinement methods may be an easier alternative [16]. Thanks to Bohr's model, we obtained the initial designs and later we refined them straightforwardly.…”

Section: Introductionmentioning

confidence: 99%

Graphene-coated resonators with frequency-selective super-scattering and super-cloaking

Raad¹,

Zapata–Rodríguez²,

Atlasbaf³

2019

J. Phys. D: Appl. Phys.

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Comb-like behavior of the multilayered graphene wrapped nanotubes in multiple scattering channels is investigated and utilized to design a structure for simultaneous super-scattering and super-cloaking. The underlying physics of the proposed structure is studied quantitatively by geometric interpretation through the associated planar structure based on the Bohr model and Foster's theorem. We observed that due to the presence of multiple dispersion bands in the planar counterpart, each cylindrical scattering Mie coefficient fulfills the resonance and invisibility conditions multiple times, depending on the selected number of layers. By refining the material and geometric parameters for the specified number of layers, resonances and zeros of the first two scattering terms are coincided simultaneously to observe super-scattering and super-cloaking, respectively. The proposed structure has lots of degrees of freedom to control the response in the operating frequency.

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Thermophotovoltaics bibliography

Broman¹

1995

Progress in Photovoltaics

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A bibliogrqdiy conruining 200 entries on thermophotovoltuic conversion of' energy hetwccn 1960 und 1995 hus been compiled. The entries ure categorized with respect to type und contents. IN TROD UC TIONhermophotovoltaic-or TPV-conversion is the conversion of thermal radiation to electricity by means of photovoltaic cells. The thermophotovoltaic process was first suggested by Aigrain in T 1960 as a two-step process for conversion of heat into electricity. The first TPV converter was built by Werth in 1963 using germanium PV cells and a propane-fueled emitter at a temperature around 1700 K.Since then, over a hundred papers and reports have been published, most of them theoretical. The theoretical possibility of very high conversion efficiency has been calculated and pointed out in many papers. The optimism stemmed from the fact that crystalline silicone is transparent for photons with energies below the bandgap energy. Thus, if the back of the silicon TPV cell was coated with a highly IR-reflecting metal (like silver), long-wavelength photons could be reflected back to the emitter. In 1980, Swanson reported a measured TPV conversion efficiency of 29% using silicon PV cells and a 2300 K graybody source.Most of the work in the early 1980s envisioned TPV as a converter of radiation from an emitter, heated by concentrated sunlight, following the 1978 concept by Bracewell and Swanson. Many papers dealt with selective emitters or selectively reflecting filters as the means to increase TPV conversion efficiency. Also, other heat sources have been discussed over the years, such as radioactive sources for space or submarine applications. The need for very high temperatures in order to achieve good efficiency with a silicon cell-based TPV converter, however, caused interest in the process to decline in the following years.At present, there is a strong renewed interest in TPV. This is due to two recent developments: the development of low-bandgap thin-film PV cells, originally developed for regular solar PV applications in tandem with high-bandgap cells (see Coutts and Lundstrom, 1993); and the recent development of efficient selectively emitting fibrous emissive burners

show abstract

Refining method for the design of multilayer stacks

Cited by 7 publications

References 8 publications

Sensitivity versus polarisation in multilayer optical thin film design

Sensitivity versus polarisation in multilayer optical thin film design

Graphene-coated resonators with frequency-selective super-scattering and super-cloaking

Thermophotovoltaics bibliography

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