Results 11 to 20 of about 27,248 (265)
Broadband absorption with gradient metasurfaces [PDF]
EPJ Applied Metamaterials, 2018 A metasurface with appropriately designed transverse spatial inhomogeneities can provide the desired phase redistribution in response to an incident wave with arbitrary incident angle.
Kwon Hoyeong +2 more
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Broadband absorption spectroscopy of heterogeneous biological tissue. [PDF]
Appl Opt, 2021 Absorption spectra ( ∼ 600 to 1064 nm) of six tissues in three healthy volunteers were measured by combining dual-slope continuous-wave broadband spectroscopy with self-calibrated frequency-domain measurements of scattering at two wavelengths (690 and 830 nm).
Blaney G +4 more
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Switchable terahertz metamaterial absorber with broadband absorption and multiband absorption
Optics Express, 2021 Based on the phase-transition property of vanadium dioxide (VO2), a terahertz bifunctional absorber is proposed with switchable functionalities of broadband absorption and multiband absorption. When VO2 is metal, the system is regarded as a broadband absorber, which is composed of VO2 patch, topas spacer, and VO2 film with metallic disks inserted.
Man Zhang, Zhengyong Song
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Broadband Microwave Absorption by Logarithmic Spiral Metasurface [PDF]
Scientific Reports, 2019 AbstractMetamaterials have enabled the design of electromagnetic wave absorbers with unprecedented performance. Conventional metamaterial absorbers usually employ multiple structure components in one unit cell to achieve broadband absorption. Here, a simple metasurface microwave absorber is proposed that has one metal-backed logarithmic spiral ...
Shubo Wang, Bo Hou, Che Ting Chan
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Broadband saturated absorption properties of bismuthene nanosheets
RSC Advances, 2021 Bismuthene nanosheets were exfoliated by the LPE method. And the SA properties have been studies by open aperture Z-scan method. The results showed bismuthene nanosheets display broadband saturated properties in near-infrared wavelengths.
Yan Sun +6 more
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Broadband Absorption Engineering of Hyperbolic Metafilm Patterns [PDF]
CLEO: 2014, 2014 Perfect absorbers are important optical/thermal components required by a variety of applications, including photon/thermal-harvesting, thermal energy recycling, and vacuum heat liberation. While there is great interest in achieving highly absorptive materials exhibiting large broadband absorption using optically thick, micro-structured materials, it is
Ji, Dengxin +6 more
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Terahertz switching between broadband absorption and narrowband absorption
Optics Express, 2020 A multilayer metamaterial with switchable functionalities is presented based on the phase-transition property of vanadium dioxide. When vanadium dioxide is in the metallic state, a broadband absorber is formed. Calculated results show that the combination of two absorption peaks enables absorptance more than 90% in the wide spectral range from 0.393 ...
Zhengyong Song, Apeng Chen, Jiahe Zhang
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Dynamical Control of Broadband Coherent Absorption in ENZ Films [PDF]
Micromachines, 2020 Interferometric effects between two counter-propagating beams incident on an optical system can lead to a coherent modulation of the absorption of the total electromagnetic radiation with 100% efficiency even in deeply subwavelength structures. Coherent perfect absorption (CPA) rises from a resonant solution of the scattering matrix and often requires ...
Bruno, Vincenzo +7 more
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A broadband passive–active sound absorption system [PDF]
The Journal of the Acoustical Society of America, 1999 In recent years, hybrid absorption systems have been implemented which achieve high sound absorption over a broad frequency range. This work is an experimental study of a broadband hybrid absorption system which is comprised of a layer of sound-absorbing material (the passive component) positioned at a distance from a movable wall (the active component)
Smith, Jerome P. +2 more
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Broadband single-shot transient absorption spectroscopy
Optics Express, 2020 The duration of transient absorption spectroscopy measurements typically limits the types of systems for which the excited state dynamics can be measured. We present a single-shot transient absorption (SSTA) instrument with a spatially encoded 60 ps time delay range and a 100 nm spectral range that is capable of acquiring a transient spectrum in 20 s ...
Kelly S. Wilson +2 more
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