Large area compatible broadband superabsorber surfaces in the VIS-NIR spectrum utilizing metal-insulator-metal stack and plasmonic nanoparticles

Dereshgi, Sina Abedini; Okyay, Ali Kemal

doi:10.1364/oe.24.017644

Cited by 23 publications

(26 citation statements)

References 13 publications

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“…It should be pointed out that since we measure normal reflection and incorporate it into absorption, bottom metal is chosen thick enough to eradicate possibility of transmission. Thus, A = 1 -R [5]. While there is negligible absorption in silver and gold bottom metal cases in NIR, we observe an absorption peak of 40% at 850 nm and 82% at 980 nm for aluminum and chromium top metals, respectively.…”

Section: Mim Absorbermentioning

confidence: 64%

MIMIM photodetectors using plasmonically enhanced MIM absorbers

Dereshgi

Okyay

2017

SPIE Proceedings

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We demonstrate super absorbing metal-insulator-metal (MIM) stacks and MIMIM photosensitive devices operating at visible and near-infrared (VIS-NIR) spectrum, where absorbing (top) MIM and photocollecting (bottom) MIM can be optimized separately. We investigate different bottom metals in absorbing MIM with nanoparticles realized by dewetting of silver thin film on top. While gold and silver have conventionally been considered the most appropriate plasmonic absorbers, we demonstrate different absorbing metals like aluminum and specifically chromium, with its plasma frequency happening at 850 nm, as more efficient layers for absorption. Absorption in chromium hits 82 percent around 1000 nm. We provide convincing evidences by doing reflection experiment and computational simulations for absorbing MIM part. We also suggest for the first time investigating electric loss tangent of metal or coherently, surface plasmon quality factor of absorbing metals which are reliable tools for engineering different metal layers. They reveal that despite the fact that gold and silver are good plasmonic scatterers in VIS-NIR and reliable absorbers in VIS region, they are not proper choices as absorbers for NIR applications. Once the most optimum absorbing design is pointed out, we integrate it on top of another metal-insulator to form an MIMIM photodetector with tunneling photocurrent path. The final optimized sample consisting of silver-hafnium oxide-chromium-aluminum oxide-silver nanoparticles (from bottom to top) has a dark current of 7nA and a photoresponsivity peak of 0.962 mA/W at 1000 nm and a full width at half maximum of 300 nm, while applied bias is 50 mV and device areas are 300 μm x 600 μm. This photoresponse shows 70 times enhancement compared to former reported spin coated rare nanoparticle MIMIMs.

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Section: Mim Absorbermentioning

confidence: 64%

MIMIM photodetectors using plasmonically enhanced MIM absorbers

Dereshgi

Okyay

2017

SPIE Proceedings

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“…In case of a MIMI system, it is instead possible to excite both low and high (guided) energy modes, respectively with p‐ and s‐polarized light. [ 39–41 ] In presence of the hybridization of the SPPs, excited at the two metal interfaces and decayed in the thick dielectric layer, it has been numerically and experimentally demonstrated the formation of gap surface plasmons (GSPs) related to high energy modes. [ 37,42–46 ] Still, the interpretation of the light‐matter interaction taking place in these systems attracts much interest in the scientific community.…”

Section: Introductionmentioning

confidence: 99%

Color Gamut Behavior in Epsilon Near‐Zero Nanocavities during Propagation of Gap Surface Plasmons

Lio

Ferraro

Giocondo

et al. 2020

Advanced Optical Materials

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This work reports on numerical and experimental results obtained in plasmonic metal–insulator nanocavities. The systems are composed of silver as metal, and different materials as insulator, namely polyvinylpyrrolidone (PVP), indium tin oxide (ITO), and zinc oxide (ZnO). The proposed nanocavities exhibit extraordinary optical effects as tunable color hue, highlighted in gamut maps, depending on incident/viewing angles, extraordinary transmission and zero reflection at resonant wavelengths, for different incident polarizations. These phenomena are related to the formation of surface plasmon polaritons (SPPs) and gap surface plasmons (GSPs) whose presence is evidenced by a remarkable sigmoidal behavior of the pseudo dielectric function, with epsilon‐near‐zero singularities in its real and imaginary parts. This function is directly calculated from the measured ellipsometric parameters Ψ and Δ and allows probing, in a fast and effective way, the existence of the plasmonic modes. Moreover, in presence of these singularities, the ellispometric analysis of the systems also shows a pronounced dephasing between p‐ and s‐reflected beams that can lead to a Goos–Hänchen shift effect to be exploited for sensing applications. Thanks to their unusual optical properties, the proposed nanocavities open a wide scenario of applications in fields like tunable color filters, optics, photonics, physical security, and sensing.

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“…There are also some lithography-free (non-arrayed) broadband absorbers that are fabricated in our group by the use of dewetting mechanism [28][29][30]. Dewetting is a method in which ultrathin layers are annealed at high temperatures to deform into nanoholes or nanoparticles, depending on the annealing recipe [31]. The nanoholes or nanoparticles with random sizes then lead to having the superposition of LSP modes each corresponding to a specific nanoparticle size.…”

Section: Introductionmentioning

confidence: 99%

A Route to Unusually Broadband Plasmonic Absorption Spanning from Visible to Mid-infrared

et al. 2019

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In this paper, a route to ultra-broadband absorption is suggested and demonstrated by a feasible design. The high absorption regime (absorption above 90%) for the suggested structure ranges from visible to mid-infrared (MIR), i.e. for the wavelength from 478 to 3,278 nm that yields an ultra-wide bandwidth of 2,800 nm. The structure consists of a top-layer-patterned metal-insulator-metal (MIM) configuration, into the insulator layer of which, an ultra-thin 5 nm layer of Manganese (Mn) is embedded. The MIM configuration represents a Ti-Al 2 O 3 -Ti tri-layer. It is shown that, without the ultra-thin layer of Mn, the absorption bandwidth is reduced to 274 nm. Therefore, adding only a 5 nm layer of Mn leads to a more than tenfold increase in the width of the absorption band. It is explained in detail that the physical mechanism contributing to this ultra-broadband result is a combination of plasmonic and non-plasmonic resonance modes, along with the appropriate optical properties of Mn. This structure has the relative bandwidth (RBW) of 149%, while only one step of lithography is required for its fabrication, so it is relatively simple to fabricate. This makes it rather promising for practical applications.

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Large area compatible broadband superabsorber surfaces in the VIS-NIR spectrum utilizing metal-insulator-metal stack and plasmonic nanoparticles

Cited by 23 publications

References 13 publications

MIMIM photodetectors using plasmonically enhanced MIM absorbers

MIMIM photodetectors using plasmonically enhanced MIM absorbers

Color Gamut Behavior in Epsilon Near‐Zero Nanocavities during Propagation of Gap Surface Plasmons

A Route to Unusually Broadband Plasmonic Absorption Spanning from Visible to Mid-infrared

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