An infrared narrow-band plasmonic perfect absorber as a sensor

Madadi, Zahra; Abedi, Kambiz; Darvish, Ghafar; Khatir, Mehdi

doi:10.1016/j.ijleo.2019.02.078

Cited by 29 publications

(14 citation statements)

References 16 publications

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“…Perfect absorbers, which absorb a specific spectral band and do not permit reflection or transmission, have recently gained considerable interest by virtue of their wide range of applications spanning photovoltaic cells 16 , photodetectors 17,18 , thermal imaging 19 , and sensors [20][21][22][23][24][25][26][27][28] . Perfect absorbers engaging various nanostructures (e.g., plasmonic and metasurface schemes) [18][19][20][21][22][23][24][25][26][27]29 and multilayered structures [1][2][3][4]28,[30][31][32][33][34][35][36][37] are being extensively studied. Although narrowband absorbers are known to be suitable for sensing and absorption filtering 2,[25][26][27] , conventional approaches have mostly focused on multiband 21,25 or broadband absorption [31][32][33]…”

Section: Narrowband and Flexible Perfect Absorber Based On A Thin-filmentioning

confidence: 99%

“…Narrowband absorbers, exhibiting a high quality factor (Q-factor) ranging from a few tens to hundreds, could be theoretically achieved by using nanostructured metamaterials even in the visible wavelength region 27 , 38 , 39 . Despite their narrow spectral bandwidth, plasmonic nanostructures have mostly been implemented to operate in the infrared region 20 – 23 . The major drawback of such nano-patterned structures is the complicated fabrication process.…”

Section: Introductionmentioning

confidence: 99%

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Narrowband and flexible perfect absorber based on a thin-film nano-resonator incorporating a dielectric overlay

Park

Lee

2020

Sci Rep

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We developed a flexible perfect absorber based on a thin-film nano-resonator, which consists of metal–dielectric–metal integrated with a dielectric overlay. The proposed perfect absorber exhibits a high quality (Q-)factor of ~ 33 with a narrow bandwidth of ~ 20 nm in the visible band. The resonance condition hinging on the adoption of a dielectric overlay was comprehensively explored by referring to the absorption spectra as a function of the wavelength and thicknesses of the overlay and metal. The results verified that utilizing a thicker metal layer improved the Q-factor and surface smoothness, while the presence of the overlay allowed for a relaxed tolerance during practical fabrication, in favor of high fidelity with the design. The origin of the perfect absorption pertaining to zero reflection was elucidated by referring to the optical admittance. We also explored a suite of perfect absorbers with varying thicknesses. An angle insensitive performance, which is integral to such a flexible optical device, was experimentally identified. Consequently, the proposed thin-film absorber featured an enhanced Q-factor in conjunction with a wide angle of acceptance. It is anticipated that our absorber can facilitate seminal applications encompassing advanced sensors and absorption filtering devices geared for smart camouflage and stealth.

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Section: Narrowband and Flexible Perfect Absorber Based On A Thin-filmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Narrowband and flexible perfect absorber based on a thin-film nano-resonator incorporating a dielectric overlay

Park

Lee

2020

Sci Rep

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“…Recently, there is increasing interesting in studying the perfect absorption of electromagnetic waves for refractive-index sensing by employing metasurfaces , metallic nanostructures , and graphene nanostructures [62][63][64][65][66][67][68][69][70][71], in violet [62], visible [1][2][3][4][5][33][34][35][36][37][38][39][40][41][42][43]63,64], infrared [6][7][8][9][10][11][12][13][14][15][16][17][44][45][46][47][48][49][50][51][52]…”

Section: Introductionmentioning

confidence: 99%

“…Recently, there is increasing interesting in studying the perfect absorption of electromagnetic waves for refractive-index sensing by employing metasurfaces [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ], metallic nanostructures [ 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , …”

Section: Introductionmentioning

confidence: 99%

“…When the impedance of artificial metasurfaces is matched with that of vacuum, the incident electromagnetic waves will be nearly completely absorbed at a certain frequency range [ 72 ]. At present, most reported metasurfaces for perfect absorption and sensing are usually composed of a periodic array of metal nanoparticles with various shapes on the top surface of a dielectric film that is deposited on a metal substrate [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. For example, Cong et al demonstrated experimentally the metasurface electromagnetic wave perfect absorber, which consists of a square array of cross-shaped aluminum nanoparticles on a polyimide spacer supported on a very thick aluminum layer [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

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Perfect Absorption and Refractive-Index Sensing by Metasurfaces Composed of Cross-Shaped Hole Arrays in Metal Substrate

Yan

Tang

et al. 2020

Nanomaterials

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Achieving perfect electromagnetic wave absorption with a sub-nanometer bandwidth is challenging, which, however, is desired for high-performance refractive-index sensing. In this work, we theoretically study metasurfaces for sensing applications based on an ultra-narrow band perfect absorption in the infrared region, whose full width at half maximum (FWHM) is only 1.74 nm. The studied metasurfaces are composed of a periodic array of cross-shaped holes in a silver substrate. The ultra-narrow band perfect absorption is related to a hybrid mode, whose physical mechanism is revealed by using a coupling model of two oscillators. The hybrid mode results from the strong coupling between the magnetic resonances in individual cross-shaped holes and the surface plasmon polaritons on the top surface of the silver substrate. Two conventional parameters, sensitivity (S) and figure of merit (FOM), are used to estimate the sensing performance, which are 1317 nm/RIU and 756, respectively. Such high-performance parameters suggest great potential for the application of label-free biosensing.

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Highly Sensitive Thin‐Film Sensing with a Toroidal Dipole Resonance in the Midinfrared Supported by an E‐Shaped Germanium Metasurface

Sun

Wang

Shi³

et al. 2022

Advanced Photonics Research

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Optical sensing applications based on resonant structures always demand on novel optical resonances with large quality factors to achieve high sensitivities. Herein, it is experimentally demonstrated that a toroidal dipole (TD) response working in the midinfrared, supported by a metasurface structure composed of E‐shaped germanium elements on a CaF2 substrate, can be harnessed to achieve high‐performance optical sensors. By elaborately designing the geometrical parameters of the E‐shaped element, a TD resonance can be supported, which is verified by multipole decomposition of the scattering spectrum. Thin films of polymethyl methacrylate (PMMA) with different thicknesses coated on top of the metasurface structures are used as an example to demonstrate the sensing characteristics of the TD resonance. Both numerical and experimental results show that the TD spectral position is highly dependent on the PMMA thickness and a minimum measurable thickness below 10 nm can be steadily achieved. The results demonstrate that the use of TD resonances provides an effective and viable approach for thin‐film sensing, which may find broad applications in biological and medical diagnosis.

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An infrared narrow-band plasmonic perfect absorber as a sensor

Cited by 29 publications

References 16 publications

Narrowband and flexible perfect absorber based on a thin-film nano-resonator incorporating a dielectric overlay

Narrowband and flexible perfect absorber based on a thin-film nano-resonator incorporating a dielectric overlay

Perfect Absorption and Refractive-Index Sensing by Metasurfaces Composed of Cross-Shaped Hole Arrays in Metal Substrate

Highly Sensitive Thin‐Film Sensing with a Toroidal Dipole Resonance in the Midinfrared Supported by an E‐Shaped Germanium Metasurface

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