Multi-band absorption induced by near-field coupling and defects in metamaterial

Luu, Dang Hong; Tung, Bui Son; Khuyen, Bui Xuan; Tuyen, Le Dac; Lãm, Vũ Đình

doi:10.1016/j.ijleo.2017.12.025

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…For convenience, we refer to the samples containing both KMnO 4 and PSNP as PSNP/KMnO 4 solutions. Since those samples are used for probing the interplay between the sample absorptions and scattering, it is important to exclude the possibility of significant physiochemical interactions between KMnO 4 and PSNP to ensure the reliability of the spectral interpretation. − …”

Section: Resultsmentioning

confidence: 99%

Effects of Cascading Optical Processes: Part II: Impacts on Experimental Quantification of Sample Absorption and Scattering Properties

et al. 2023

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In Part I of the three companion articles, we reported the effects of light scattering on experimental quantification of scattering extinction, intensity, and depolarization in solutions that contain only scatterers with no significant absorption and photoluminescence activities. The present work (Part II) studies the effects of light scattering and absorption on a series of optical spectroscopic measurements done on samples that contain both absorbers and scatterers, but not emitters. The experimental UV−vis spectrum is the sum of the sample absorption and scattering extinction spectra. However, the upper limit of the experimental Beer's-law-abiding extinction can be limited prematurely by the interference of forward scattered light. Light absorption reduces not only the sample scattering intensity but also the scattering depolarization. The impact of scattering on sample light absorption is complicated, depending on whether the absorption of scattered light is taken into consideration. Scattering reduces light absorption along the optical path length from the excitation source to the UV−vis detector. However, the absorption of the scattered light can be adequate to compensate the reduced light absorption along such optical path, making the impacts of light scattering on the sample total light absorption negligibly small (<10%). The latter finding constitutes a critical validation of the integrating-sphere-assisted resonance synchronous spectroscopic method for experimental quantification of absorption and scattering contribution to the sample UV−vis extinction spectra. The techniques and general guidelines provided in this work should help improve the reliability of optical spectroscopic characterization of nanoscale or larger materials, many of which are simultaneous absorbers and scatterers. The insights from this work are foundational for Part III of this series of work, which is on the cascading optical processes on spectroscopic measurements of fluorescent samples.

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Section: Resultsmentioning

confidence: 99%

Effects of Cascading Optical Processes: Part II: Impacts on Experimental Quantification of Sample Absorption and Scattering Properties

et al. 2023

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“…This interesting effect is caused by the same order of the periodicity and the operational wavelength at 17.1 GHz. Therefore, the periodic metallic patterns of proposed MA can be regarded as a two-dimensional metallic grating, which creates the guided-mode resonances (GMRs) [47], [48], [49], [50], [51]. It was reported that the magnetic resonance excited in MA structure that obtained the wide-angle insensitivity for both TE and TM polarizations [52], [53].…”

Section: Resultsmentioning

confidence: 99%

Simple Design of a Wideband and Wide-Angle Insensitive Metamaterial Absorber Using Lumped Resistors for X- and Ku-Bands

et al. 2021

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We report a wideband and polarization-/wide-angle insensitive metamaterial absorber based on a symmetry structure associated with surface mount resistors. The proposed structure consists of a periodic array of a top metal symmetry resonator loading with four lumped resistors and a continuous metal ground plane separated by a dielectric substrate of FR-4. A prototype of the proposed absorber is fabricated and measured, confirming a good agreement between the measurement and simulation results. The proposed absorber shows polarization-insensitive behavior and the absorption response in a frequency range from 8-18 GHz covering the entire X-and Ku-bands with an absorptivity above 80% for a wide incident angle up to 40 o for both transverse electric and transverse magnetic polarizations. Compared with the reported broadband absorbers using lumped resistors, our proposed absorber exhibits excellent characteristics in terms of compact and simple structure, high relative absorption bandwidth, and polarization and wide-incident insensitivity. Therefore, this design shows promising potential for both X-and Ku-band applications.

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Dual-band isotropic metamaterial absorber based on near-field interaction in the Ku band

Dinh

Bùi

et al. 2020

Current Applied Physics

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Multi-band absorption induced by near-field coupling and defects in metamaterial

Cited by 5 publications

References 23 publications

Effects of Cascading Optical Processes: Part II: Impacts on Experimental Quantification of Sample Absorption and Scattering Properties

Effects of Cascading Optical Processes: Part II: Impacts on Experimental Quantification of Sample Absorption and Scattering Properties

Simple Design of a Wideband and Wide-Angle Insensitive Metamaterial Absorber Using Lumped Resistors for X- and Ku-Bands

Dual-band isotropic metamaterial absorber based on near-field interaction in the Ku band

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