Impact of surface roughness on the scatter losses and the scattering distribution of surfaces and thin film coatings

Schröder, Sven; Herffurth, Tobias; Duparré, Angela; Harvey, James E.

doi:10.1117/12.896989

Cited by 10 publications

(7 citation statements)

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“…Therefore, the reduced thermochromic performance of patterns 1−3 compared to the flat VO 2 thin film can also be related to the scattering caused by femtosecond laser-induced surface roughness. 60 When compared to patterns 1−3, patterns 4−6 processed at different laser pulse energies show a distinct variation in their thermochromic properties. Pattern 4 processed at the pulse energy of 7 nJ shows T lum (Avg) = 28.4%, ΔT NIR = 10.8%, and ΔT sol = 10.9% (Table S3).…”

Section: Resultsmentioning

confidence: 99%

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Femtosecond Laser-Induced Vanadium Oxide Metamaterial Nanostructures and the Study of Optical Response by Experiments and Numerical Simulations

Bhupathi

Wang

Abutoama

et al. 2020

ACS Appl. Mater. Interfaces

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Surface patterning is a popular approach to produce photonic metasurfaces that are tunable when electro-optic, thermooptic, or magneto-optic materials are used. Vanadium oxides (V y O x ) are well-known phase change materials with many applications, especially when used as tunable metamaterial photonic structures. Particularly, VO 2 is a well-known thermochromic material for its near-room-temperature phase transition from the insulating to the metallic state. One-dimensional (1D) VO 2 nanograting structures are studied by numerical simulation, and the simulation results reveal that the VO 2 nanograting structures could enhance the luminous transmittance (T lum ) compared with a pristine flat VO 2 surface. It is worth mentioning that T lum is also polarization-dependent, and both larger grating height and smaller grating periodicity give enhanced T lum , particularly at TE polarization in both insulating (20 °C) and metallic (90 °C) states of VO 2 . Femtosecond laser-patterned VO 2 films exhibiting nanograting structures with an average periodicity of ≈500−700 nm have been fabricated for the first time to enhance thermochromic properties. Using X-ray photoelectron spectroscopy, it is shown that at the optimum laser processing conditions, VO 2 dominates the film composition, while under extra processing, the existence of other vanadium oxide phases such as V 2 O 3 and V 2 O 5 increases. Such structures show enhanced transmittance in the near-infrared (NIR) region, with an improvement in NIR and solar modulation abilities (ΔT NIR = 10.8%, ΔT sol = 10.9%) compared with a flat VO 2 thin film (ΔT NIR = 8%, ΔT sol = 10.2%). The slight reduction in transmittance in the visible region is potentially due to the scattering caused by the imperfect nanograting structures. This new patterning approach helps understand the polarization-dependent optical response of VO 2 thin films and opens a new gateway for smart devices.

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Section: Resultsmentioning

confidence: 99%

“…In particular, pattern 3 acquired at the high pulse number 100 exhibited the highest roughness of 41.2 nm compared to all of the other patterns. Therefore, the reduced thermochromic performance of patterns 1–3 compared to the flat VO 2 thin film can also be related to the scattering caused by femtosecond laser-induced surface roughness …”

Section: Resultsmentioning

confidence: 99%

Femtosecond Laser-Induced Vanadium Oxide Metamaterial Nanostructures and the Study of Optical Response by Experiments and Numerical Simulations

Bhupathi

Wang

Abutoama

et al. 2020

ACS Appl. Mater. Interfaces

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“…Пучок света 3 круглого сечения диаметром 3 mm проходил через анализируемую кварцевую пластину, и через входное отверстие диаметром 6 mm поступал внутрь интегрирующей сферы. Таким образом, входная угловая апертура, определяемая как отношение радиуса входного отверстия При отражении света с длиной волны λ от поверхности и малой величине шероховатости по отношению к длине волны света (σ/λ < 0.02) ARS описывается формулой Рэлея−Райса (см., например, [15]):…”

Section: рассеяние света шероховатой поверхностью кварцаunclassified

Топография Поверхности И Пропускание Света Кварцевыми Окнами После Экспозиции В Высокочастотном Разряде В Дейтерии И Смеси Дейтерия С Азотом

Городецкий¹,

Маркин²,

Буховец³

et al. 2021

Журнал Технической Физики

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The effect of a cleaning discharge plasma on the KU-1 optical quartz surface topography and transmission in visible and near IR ranges (400-1000 nm) was studied. For the study, we used crossed DC and RF discharges in D2 and D2/N2 mixture, where the N2 fraction was ~25 mol %. The addition of nitrogen increased sputtering rate from 250 to 1200 nm / h while maintaining stoichiometry of the surface layers. The rms surface roughness decreased after the plasma exposure from 1.3 to 0.6 nm, while the quartz transmittance has not changed. The surface roughness analysis and calculation of diffusion scattered light at 400 nm transmitted through the quartz were performed using the power spectral density function of AFM.

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“…Previous works [4][5][6][7][8][9][10][11][12][13][14] have allowed to develop theoretical models to predict scattering losses of optical components. Scalar theories [15] give a first approximation of the total scattered light S for low roughnesses.…”

Section: Modeling Of Electromagnetic Optical Field Scattered By Intermentioning

confidence: 99%

Analysis and control of light scattered by optical components for space applications

Zerrad

Lequime

Amra

2019

International Conference on Space Optics — ICSO 2018

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Space applications require more and more demanding optical functions. This evolution led to the development of new generation of optical components with extreme performances in terms of scattering level, roughness, localized defects, spectral evolution of performances, coherent backscattering…. In this context, optical components produced for space applications present an increasing complexity with extreme specifications. As a consequence, new problematics specific to this generation of components appeared and among these, the management of light scattered by these components remains a significant challenge. For example, for complex optical coatings (typically with more than 100 interfaces), the scattering response of the component is not directly correlated to the substrate spectrum, as it is the case for simple coatings (less than 40 layers). For this reason, an accurate modelling of light scattered by complex optical coatings requires a global analysis taking into account different parameters from the design and manufacturing to the conditions of use of the component. We will present in this paper the last developments performed by the Scattering Group of Institut Fresnel for the modelling and the metrology of light scattered by complex optical components for space applications. A specific care will be given to recent studies performed on narrow band filters for earth observation and high performances mirrors. For each of these applications, the specific problematics and corresponding challenges will be presented and experimental and numerical results will be detailed. The agreement between metrology and modelling will be highlighted.

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Impact of surface roughness on the scatter losses and the scattering distribution of surfaces and thin film coatings

Cited by 10 publications

References 0 publications

Femtosecond Laser-Induced Vanadium Oxide Metamaterial Nanostructures and the Study of Optical Response by Experiments and Numerical Simulations

Femtosecond Laser-Induced Vanadium Oxide Metamaterial Nanostructures and the Study of Optical Response by Experiments and Numerical Simulations

Топография Поверхности И Пропускание Света Кварцевыми Окнами После Экспозиции В Высокочастотном Разряде В Дейтерии И Смеси Дейтерия С Азотом

Analysis and control of light scattered by optical components for space applications

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