Large‐Area Metasurface Perfect Absorbers from Visible to Near‐Infrared

Akselrod, Gleb M.; Huang, Jiani; Hoang, Thang B.; Bowen, Patrick T.; Su, Logan; Smith, David R.; Mikkelsen, Maiken H.

doi:10.1002/adma.201503281

Cited by 314 publications

(259 citation statements)

References 36 publications

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“…The TS1 activation energy barrier is roughly 27 kcal/mol (∼45 k B T at ambient conditions) irrespective of d Au . This activation energy is comparable to that of imine carbons on polycarbodiimides measured in 13 C CP/ MAS NMR spectroscopy. 66 The intermediate complex further dissociates to yield anhydride with a TS2 activation energy barrier estimated at 5−8 kcal/mol.…”

Section: Acs Nanosupporting

confidence: 76%

Driving Chemical Reactions in Plasmonic Nanogaps with Electrohydrodynamic Flow

Thrift

Nguyen

Darvishzadeh-Varcheie

et al. 2017

ACS Nano

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Nanoparticles from colloidal solutionwith controlled composition, size, and shapeserve as excellent building blocks for plasmonic devices and metasurfaces. However, understanding hierarchical driving forces affecting the geometry of oligomers and interparticle gap spacings is still needed to fabricate high-density architectures over large areas. Here, electrohydrodynamic (EHD) flow is used as a long-range driving force to enable carbodiimide cross-linking between nanospheres and produces oligomers exhibiting sub-nanometer gap spacing over mm 2 areas. Anhydride linkers between nanospheres are observed via surface-enhanced Raman scattering (SERS) spectroscopy. The anhydride linkers are cleavable via nucleophilic substitution and enable placement of nucleophilic molecules in electromagnetic hotspots. Atomistic simulations elucidate that the transient attractive force provided by EHD flow is needed to provide a sufficient residence time for anhydride cross-linking to overcome slow reaction kinetics. This synergistic analysis shows assembly involves an interplay between long-range driving forces increasing nanoparticle− nanoparticle interactions and probability that ligands are in proximity to overcome activation energy barriers associated with short-range chemical reactions. Absorption spectroscopy and electromagnetic full-wave simulations show that variations in nanogap spacing have a greater influence on optical response than variations in close-packed oligomer geometry. The EHD flow−anhydride cross-linking assembly method enables close-packed oligomers with uniform gap spacings that produce uniform SERS enhancement factors. These results demonstrate the efficacy of colloidal driving forces to selectively enable chemical reactions leading to future assembly platforms for large-area nanodevices.

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Section: Acs Nanosupporting

confidence: 76%

Driving Chemical Reactions in Plasmonic Nanogaps with Electrohydrodynamic Flow

Thrift

Nguyen

Darvishzadeh-Varcheie

et al. 2017

ACS Nano

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“…Such gratings have been shown to possess a photoresponsivity of 0.6 mA/W and an internal quantum efficiency of 0.2%, a roughly 20 times improvement over the nanoantenna devices. A hot electron photodetector with further enhanced efficiency was demonstrated [48] ( Figure 2C) by integrating the concept of metamaterial perfect absorbers [93,94] with the hot electron transfer process. The perfect absorption of light is realized by overlapping the LSPR with a Fabry-Perot resonance in the silicon cavity.…”

Section: Free-space Photodetectorsmentioning

confidence: 99%

Harvesting the loss: surface plasmon-based hot electron photodetection

2016

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Abstract:Although the nonradiative decay of surface plasmons was once thought to be only a parasitic process within the plasmonic and metamaterial communities, hot carriers generated from nonradiative plasmon decay offer new opportunities for harnessing absorption loss. Hot carriers can be harnessed for applications ranging from chemical catalysis, photothermal heating, photovoltaics, and photodetection. Here, we present a review on the recent developments concerning photodetection based on hot electrons. The basic principles and recent progress on hot electron photodetectors are summarized. The challenges and potential future directions are also discussed.

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“…[5][6][7][8][9] Additionally, embedding light emitting materials in such sculpted electromagnetic environments allows for tailored light-matter interactions, including lasing, 10,11 ultrafast spontaneous emission, 12 Purcell factors greater than 1000 (Ref. 13), and 30 000-fold photoluminescence enhancements.…”

mentioning

confidence: 99%

“…The resonance of these nanopatch antennas depends strongly on the size of the nanocubes and the thickness and properties of the dielectric spacer material. 9,28 For example, a change in the gap thickness of only 4 nm, from 1 to 5 nm, results in a large shift of the plasmon resonance from 1007 nm to 720 nm. 9 Here, for a fixed nanocube size, the resonance of the nanopatch antennas is actively tuned by the application of an external bias voltage.…”

mentioning

confidence: 99%

“…9,28 For example, a change in the gap thickness of only 4 nm, from 1 to 5 nm, results in a large shift of the plasmon resonance from 1007 nm to 720 nm. 9 Here, for a fixed nanocube size, the resonance of the nanopatch antennas is actively tuned by the application of an external bias voltage. To apply an electrical potential across the nanoscale gap region an indium tin oxide (ITO) coated glass slide in combination with ionic liquid is used as the top electrode and the gold film is used as the bottom electrode.…”

mentioning

confidence: 99%

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Broad electrical tuning of plasmonic nanoantennas at visible frequencies

Hoang

Mikkelsen

2016

Applied Physics Letters

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We report an experimental demonstration of electrical tuning of plasmon resonances of optical nanopatch antennas over a wide wavelength range. The antennas consist of silver nanocubes separated from a gold film by a thin 8 nm polyelectrolyte spacer layer. By using ionic liquid and indium tin oxide coated glass as a top electrode, we demonstrate dynamic and reversible tuning of the plasmon resonance over 100 nm in the visible wavelength range using low applied voltages between −3.0 V and 2.8 V. The electrical potential is applied across the nanoscale gap causing changes in the gap thickness and dielectric environment which, in turn, modifies the plasmon resonance. The observed tuning range is greater than the full-width-at-half-maximum of the plasmon resonance, resulting in a tuning figure of merit of 1.05 and a tuning contrast greater than 50%. Our results provide an avenue to create active and reconfigurable integrated nanophotonic components for applications in optoelectronics and sensing.

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Large‐Area Metasurface Perfect Absorbers from Visible to Near‐Infrared

Cited by 314 publications

References 36 publications

Driving Chemical Reactions in Plasmonic Nanogaps with Electrohydrodynamic Flow

Driving Chemical Reactions in Plasmonic Nanogaps with Electrohydrodynamic Flow

Harvesting the loss: surface plasmon-based hot electron photodetection

Broad electrical tuning of plasmonic nanoantennas at visible frequencies

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