Mid-infrared narrow band plasmonic perfect absorber for vibrational spectroscopy

Korkmaz, Semih; Türkmen, Mustafa; Aksu, Serap

doi:10.1016/j.sna.2019.111757

Cited by 33 publications

(21 citation statements)

References 41 publications

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“…In conclusion 16 , we experimentally presented a narrow band (85 cm -1 ) multi-resonant perfect absorber operating in the mid-IR range for the first time and demonstrated its usage for surface enhanced infrared absorption spectroscopy. Firstly, we performed theoretical analysis to investigate the physical origin of the dual-resonant behavior with strong near-field intensity enhancement distributions.…”

Section: Discussionmentioning

confidence: 84%

“…We design the simulation platform identical to the configuration that we take the spectroscopic measurements 16 . Thus, the light illumination has been a plane wave, sent normally on the structures.…”

Section: Resultsmentioning

confidence: 99%

“…Experimental difference spectroscopy for the C=O band at the first resonance mode -CH3 asymmetric band at the second resonance mode are calculated. The absorption is 33% of the PA resonance intensity for the C=O band and 1.5 % for the -CH3 asymmetric band16 .…”

mentioning

confidence: 96%

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Surface enhanced vibrational spectroscopy using ultra narrow-band perfect absorber

Aksu

2020

Metamaterials, Metadevices, and Metasystems 2020

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In this work, we present a narrow-band (sub-100 cm -1 ) and multi-band metamaterial perfect absorber operating in the mid-IR frequency regime for analysis of biomolecules with vibrational spectroscopy. The presented perfect absorber is based on multi-layer metamaterial plasmonic nanoantennas. We used numerical and experimental work to fine tune the parameters of the PA and control its spectral response. The suggested PA system provides high absorbance values (100%) in the mid-IR region and near-field enhancement factor of 10 3 at the corresponding resonance values. The experimental results are well agreeing the numerical results. The working principle of the presented perfect absorption can be both explained by impedance matching and critical coupling phenomenon. The fabricated PA shows strong narrow band resonance and all the resonance energy could be transferred to thin films (10 nm) for higher sensitivity. In addition, PA shows multi-band resonances within the mid-IR region, thus it can be effectively used for simultaneously detecting the different biomolecular fingerprints. In this sense, we experimentally observed absorption of carbonyl (C=O) and asymmetric methyl (-CH3) stretching bands of thin polymethyl methacrylate (PMMA) film on the narrow band resonance of PA.

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Section: Discussionmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

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Surface enhanced vibrational spectroscopy using ultra narrow-band perfect absorber

Aksu

2020

Metamaterials, Metadevices, and Metasystems 2020

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“…The thickness of the dielectric spacer within the MIM configuration is an important parameter to achieve perfect absorption (

) and narrowband resonances (FWHM below 15 nm) [ 45 ]. The prior studies explained that the perfect absorption can be achieved periodically at various dielectric thicknesses over a frequency range [ 33 , 34 ].…”

Section: Structure Design and Numerical Analysismentioning

confidence: 99%

A Narrow-Band Multi-Resonant Metamaterial in Near-IR

Ali

Aksu

2020

Materials

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We theoretically investigate a multi-resonant plasmonic metamaterial perfect absorber operating between 600 and 950 nm wavelengths. The presented device generates 100% absorption at two resonance wavelengths and delivers an ultra-narrow band (sub-20 nm) and high quality factor (Q=44) resonance. The studied perfect absorber is a metal–insulator–metal configuration where a thin MgF2 spacer is sandwiched between an optically thick gold layer and uniformly patterned gold circular nanodisc antennas. The localized and propagating nature of the plasmonic resonances are characterized and confirmed theoretically. The origin of the perfect absorption is investigated using the impedance matching and critical coupling phenomenon. We calculate the effective impedance of the perfect absorber and confirm the matching with the free space impedance. We also investigate the scattering properties of the top antenna layer and confirm the minimized reflection at resonance wavelengths by calculating the absorption and scattering cross sections. The excitation of plasmonic resonances boost the near-field intensity by three orders of magnitude which enhances the interaction between the metamaterial surface and the incident energy. The refractive index sensitivity of the perfect absorber could go as high as S=500 nm/RIU. The presented optical characteristics make the proposed narrow-band multi-resonant perfect absorber a favorable platform for biosensing and contrast agent based bioimaging.

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“…Extensive studies have been reported on metamaterial absorbers operating in different frequency regimes 20 – 22 owing to the prevalent applications in bolometer, holograms, stealth technology, solar energy harvesting, wireless communications, and sensors 15 – 17 , 23 – 27 . From the perspective of absorption bandwidth, the narrowband metamaterial absorbers covering the visible and infrared (IR) regimes find applications, such as thermal emission manipulation, nano-antennas, sensors, and resonators 28 , 29 . On the other hand, wideband absorbers have potentials in solar energy converters, artificial colors, thermal emitters, and many other optoelectronic applications 30 , 31 .…”

Section: Introductionmentioning

confidence: 99%

Elliptical metallic rings-shaped fractal metamaterial absorber in the visible regime

Bilal

Saeed

Choudhury

et al. 2020

Sci Rep

120

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Achieving the broadband response of metamaterial absorbers has been quite challenging due to the inherent bandwidth limitations. Herein, the investigation was made of a unique kind of visible light metamaterial absorber comprising elliptical rings-shaped fractal metasurface using tungsten metal. It was found that the proposed absorber exhibits average absorption of over 90% in the visible wavelength span of 400-750 nm. The features of perfect absorption could be observed because of the localized surface plasmon resonance that causes impedance matching. Moreover, in the context of optoelectronic applications, the absorber yields absorbance up to ~ 70% even with the incidence obliquity in the range of 0°-60° for transverse electric polarization. The theory of multiple reflections was employed to further verify the performance of the absorber. the obtained theoretical results were found to be in close agreement with the simulation results. in order to optimize the results, the performance was analyzed in terms of the figure of merit and operating bandwidth. Significant amount of absorption in the entire visible span, wide-angle stability, and utilization of low-cost metal make the proposed absorber suitable in varieties of photonics applications, in particular photovoltaics, thermal emitters and sensors. In recent years, optical metamaterials have gained considerable attention in both the engineering and scientific lexicons owing to the exotic electromagnetic (EM) response, that led to varieties of technological applications 1-6. As has been in reports, these artificially engineered materials allow the versatile utility to manipulate the amplitude, phase, and polarization of the incidence radiation at a deep subwavelength scale 7. Metamaterials are generally comprised of nano-resonators, scatterers and meta-molecules of different size, shape, geometry, orientation, and arrangement. Within the context, the negative refractive index (RI)-based metasurfaces enable intriguing applications in super lensing 8 , planar filters 3 , optical cloaking 9,10 , wavefront manipulation 11,12 , optical chirality 13 , medical imaging 14 , and perfect absorption 15-17. These are also tremendously exploited in various other EM applications, namely asymmetric transmission, plasmon-induced transparency, holography, and bio-sensing 6,17-19. Extensive studies have been reported on metamaterial absorbers operating in different frequency regimes 20-22 owing to the prevalent applications in bolometer, holograms, stealth technology, solar energy harvesting, wireless communications, and sensors 15-17,23-27. From the perspective of absorption bandwidth, the narrowband metamaterial absorbers covering the visible and infrared (IR) regimes find applications, such as thermal emission manipulation, nano-antennas, sensors, and resonators 28,29. On the other hand, wideband absorbers have potentials in solar energy converters, artificial colors, thermal emitters, and many other optoelectronic applications 30,31. Within the context, photovoltaics have im...

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Mid-infrared narrow band plasmonic perfect absorber for vibrational spectroscopy

Cited by 33 publications

References 41 publications

Surface enhanced vibrational spectroscopy using ultra narrow-band perfect absorber

Surface enhanced vibrational spectroscopy using ultra narrow-band perfect absorber

A Narrow-Band Multi-Resonant Metamaterial in Near-IR

Elliptical metallic rings-shaped fractal metamaterial absorber in the visible regime

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