Design of switchable, narrowband thermal absorption peaks in metal-vanadium-dioxide gratings

Krishnan, Aravind; O’Gorman, Amedee B; Povinelli, Michelle L.

doi:10.1088/2040-8986/aba812

Cited by 13 publications

(4 citation statements)

References 36 publications

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“…Additionally, according to Coupled-mode theory, the critical coupling condition can be achieved once the radiative (Γ rad ) and absorptive (Γ abs ) decay rates are equal i.e. Γ rad =Γ abs [28][29][30] and given by the following expressions [30]:…”

Section: Resultsmentioning

confidence: 99%

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Phase change material-based nano-cavity as an efficient optical modulator

2020

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Structural phase transition induced by temperature or voltage in phase change materials has been used for many tunable photonic applications. Exploiting reversible and sub-ns fast switching in antimony trisulfide (Sb2S3) from amorphous (Amp) to crystalline (Cry), we introduced a reflection modulator based on metal–dielectric–metal structure. The proposed design exhibits tunable, perfect, and multi-band absorption from visible to the near-infrared region. The reflection response of the system shows >99% absorption of light at normal incidence. The maximum achievable modulation efficiency with a narrow line width is ∼98%. Interestingly, the designed cavity supports critical resonance in an ultrathin (∼λ/15) Sb2S3 film with perfect, broadband, and tunable absorption. Finally, we proposed a novel hybrid cavity design formed of Cry and Amp Sb2S3 thin films side-by-side to realize an optical modulator via relative motion between the incident light beam and cavity. The proposed lithographic free structure can be also used for filtering, optical switching, ultrathin photo-detection, solar energy harvesting, and other energy applications.

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Section: Resultsmentioning

confidence: 99%

“…where r p is background reflection, w 0 is resonant wavelength and j is the associated phase with resonant modes. Equation (1) can further reduce to equation (2) in the limit of r 1 p and j  0 [30]:…”

Section: Resultsmentioning

confidence: 99%

Phase change material-based nano-cavity as an efficient optical modulator

2020

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“…For a given structure, we can extract the loss rates from the spectra and tune them to improve the field enhancement. Using CMT, the absorption spectra of these plasmonic gratings can be expressed as [22][23][24] A…”

Section: Theorymentioning

confidence: 99%

Hot Electron Plasmon-Resonant Grating Structures for Enhanced Photochemistry: A Theoretical Study

et al. 2021

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Metallic grating structures have been shown to provide an effective platform for generating hot electrons and driving electrochemical reactions. Here, we present a systematic theoretical study of the surface plasmon resonance in different corrugated metallic grating structures using computational electromagnetic tools (i.e., the finite difference time domain (FDTD) method). We identify the corrugation parameters that produce maximum resonant field enhancement at commonly used wavelengths for photocatalytic applications (633 nm and 785 nm) in different material systems, including Ag, Au, Cu, Al, and Pt. The absorption spectra of each grating structure have been fitted with the analytical equation obtained from Coupled Mode Theory. We then extracted the absorptive and radiative loss rates. The field enhancement can be maximized by matching the absorption and radiation losses via tuning the geometric parameters. We could improve the average field enhancement of 633 nm and 785 nm modes by a factor of 1.8× and 3.8× for Ag, 1.4× and 3.6× for Au, and 1.2× and 2.6× for Cu. The optimum structures are found to be shallower for Ag, Au, and Cu; deeper for Pt; and to almost remain the same for Al. The gratings become flat for all the metals for increasing the average field enhancement. Overall, Ag and Au were found to be the best in terms of overall field enhancement while Pt had the worst performance.

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“…If the two modes have exactly the same spectral shapes, there will be flat and unitary transmission across the spectrum when the Kerker condition is satisfied. Q is proportional to f 0 /γ [43] where f 0 is the resonant frequency and γ is the damping coefficient. From Fig.…”

Section: Theoretical Analysis and Verificationmentioning

confidence: 99%

Nano shell impact on Huygens’ metasurface dipolar resonances and optical response

et al. 2021

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Due to several advantages over conventional devices for the control of electromagnetic (EM) radiation, the demand for metasurface utilization based on artificially engineered micro and nanostructures is boosted, especially in new generation devices. Among the metasurfaces family, there has been a growing interest in Huygens' metasurfaces that are easy to fabricate due to their lower aspect ratio compared to their counterparts and also provide alternative electromagnetic radiation control by tuning the dipolar electric and magnetic resonances. In this study, an all-dielectric Huygens' metasurface consisting of the high-refractive-index nano shells embedded in the low-refractive-index environment is designed and extensively investigated numerically and analytically in the nearinfrared spectrum. By simply tuning the nano shell inner radius, the effects on the dipolar resonances are unveiled specific to the proposed design. To assess the EM wave interactions in the designed Huygens' metasurface, an analytical model based on the coupled discrete dipole approach is applied for selected distinct cases of the designed metasurface. It is shown that the spectral position of the dipolar resonances can be detuned or tuned simultaneously depending on the structural parameter of the meta-atoms arranged in a periodic array. This study sheds light on the physics and abilities of the nano shell structure as a Huygens' metasurface for the potential applications of metasurface-based light-matter interaction including imaging and sensing.

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Design of switchable, narrowband thermal absorption peaks in metal-vanadium-dioxide gratings

Cited by 13 publications

References 36 publications

Phase change material-based nano-cavity as an efficient optical modulator

Phase change material-based nano-cavity as an efficient optical modulator

Hot Electron Plasmon-Resonant Grating Structures for Enhanced Photochemistry: A Theoretical Study

Nano shell impact on Huygens’ metasurface dipolar resonances and optical response

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