General Strategy for Broadband Coherent Perfect Absorption and Multi-wavelength All-optical Switching Based on Epsilon-Near-Zero Multilayer Films

Kim, Tae Young; Badsha, Md. Alamgir; Yoon, Junho; Lee, Seon Young; Jun, Young Chul; Hwangbo, Chang Kwon

doi:10.1038/srep22941

Cited by 60 publications

(31 citation statements)

References 30 publications

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“…The enhanced SE A value had a close relationship with the epsilonnear-zero property of Ag32 composites, because of good impedance matching and absorption loss. Similar enhanced absorption phenomenon was also observed in indium tin oxide at infrared band [39]. Therefore, the epsilon-nearzero property is like an "on-off switch" of electromagnetic shielding, providing the possibility of intelligent frequency selection.…”

Section: Electromagnetic Simulation and Shielding Effectivenesssupporting

confidence: 67%

Targeted Double Negative Properties in Silver/Silica Random Metamaterials by Precise Control of Microstructures

et al. 2019

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Creative Commons Attribution License (CC BY 4.0).The mechanism of negative permittivity/permeability is still unclear in the random metamaterials, where the precise control of microstructure and electromagnetic properties is also a challenge due to its random characteristic. Here silver was introduced into porous SiO 2 microsphere matrix by a self-assemble and template method to construct the random metamaterials. The distribution of silver was restricted among the interstices of SiO 2 microspheres, which lead to the precise regulation of electrical percolation (from hoping to Drude-type conductivity) with increasing silver content. Negative permittivity came from the plasma-like behavior of silver network, and its value and frequency dispersion were further adjusted by Lorentz-type dielectric response. During this process, the frequency of epsilon-near-zero (ENZ) could be adjusted accordingly. Negative permeability was well explained by the magnetic response of eddy current in silver micronetwork. The calculation results indicated that negative permeability has a linear relation with 0.5 , showing a relaxation-type spectrum, different from the "magnetic plasma" of periodic metamaterials. Electromagnetic simulations demonstrated that negative permittivity materials and ENZ materials, with the advantage of enhanced absorption (40dB) and intelligent frequency selection even in a thin thickness (0.1 mm), could have potentials for electromagnetic attenuation and shielding. This work provides a clear physical image for the theoretical explanation of negative permittivity and negative permeability in random metamaterials, as well as a novel strategy to precisely control the microstructure of random metamaterials.

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Section: Electromagnetic Simulation and Shielding Effectivenesssupporting

confidence: 67%

Targeted Double Negative Properties in Silver/Silica Random Metamaterials by Precise Control of Microstructures

et al. 2019

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“…In the 2016, Chai et al successfully designed an ultrafast all-optical switch using plasma-photon-hybrid nanostructures-coated multicomponent nanocomposite [8]. Neira et al propose a general, easy-to-implement scheme for all-optical switch using epsilon-near-zero (ENZ) materials [9,10]. Microring resonators are also generally considered as an ideal platform for demonstrating all-optical switching [11,12].…”

Section: Introductionmentioning

confidence: 99%

All-Optical Switching Based on the Plasma Channel Induced by Laser Pulses

Tan

Zhan

et al. 2018

Advances in Condensed Matter Physics

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We display a theoretical and experimental study of all-optical switching for signal lasers based on the plasma channel induced by the control laser. Using the plasma channel generated in the carbon disulfide (CS 2 ) solution, the signal light can be modulated as some spatial distributions including unchanging, ring-shaped beam, and other intensity profiles. The modulation on the signal light can be conveniently adjusted by changing the control light's incident intensity distribution. We can infer the dark spot shape in the modulated signal laser through the intensity profile of control laser beam. These results provide the great potential of plasma channel induced by lasers as an all-optical switching for various optoelectronic applications.

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“…The optical properties of plasmonic and optical devices in semiconductors and transparent metal oxides can be tuned by altering their carrier concentration through voltages or heat [20,[32][33][34][35][36][37][38][39][40][41]. Very recently, indium tin oxide (ITO) and Ga-doped ZnO have been used to realize tunable TLA [33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

“…Very recently, indium tin oxide (ITO) and Ga-doped ZnO have been used to realize tunable TLA [33][34][35][36][37][38][39][40][41]. From the material side, ITO and Ga or Al-doped ZnO (AZO)-based transparent metal oxide exhibits tunable optical properties that can be thermally, electrically, or optically switched [33][34][35][36][37][38][39][40][41], and is compatible with standard complementary metal-oxide-semiconductor (CMOS) fabrication and integration procedures [40,42]. Furthermore, TLA can also be achieved near the epsilon-near-zero regime in ITO [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Coupling of Surface Plasmon Polariton in Al-Doped ZnO with Fabry-Pérot Resonance for Total Light Absorption

et al. 2017

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Al-doped ZnO (AZO) can be used as an electrically tunable plasmonic material in the near infrared range. This paper presents finite-difference time-domain (FDTD) simulations on total light absorption (TLA) resulting from the coupling of a surface plasmon polariton (SPP) with Fabry-Pérot (F-P) resonance in a three-layer structure consisting of an AZO square lattice hole array, a spacer, and a layer of silver. Firstly, we identified that the surface plasmon polariton (SPP) that will couple to the F-P resonance because of an SPP standing wave in the (1,0) direction of the square lattice. Two types of coupling between SPP and F-P resonance are observed in the simulations. In order to achieve TLA, an increase in the refractive index of the spacer material leads to a decrease in the thickness of the spacer. Additionally, it is shown that the replacement of silver by other, more cost-effective metals has no significance influence on the TLA condition. It is observed in the simulations that post-fabrication tunability of the TLA wavelength is possible via the electrical tunability of the AZO. Finally, electric field intensity distributions at specific wavelengths are computed to further prove the coupling of SPP with F-P resonance. This work will contribute to the design principle for future device fabrication for TLA applications.

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General Strategy for Broadband Coherent Perfect Absorption and Multi-wavelength All-optical Switching Based on Epsilon-Near-Zero Multilayer Films

Cited by 60 publications

References 30 publications

Targeted Double Negative Properties in Silver/Silica Random Metamaterials by Precise Control of Microstructures

Targeted Double Negative Properties in Silver/Silica Random Metamaterials by Precise Control of Microstructures

All-Optical Switching Based on the Plasma Channel Induced by Laser Pulses

Coupling of Surface Plasmon Polariton in Al-Doped ZnO with Fabry-Pérot Resonance for Total Light Absorption

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