Harvesting the loss: surface plasmon-based hot electron photodetection

Li, Wei; Valentine, Jason

doi:10.1515/nanoph-2015-0154

Cited by 215 publications

(155 citation statements)

References 166 publications

Supporting

Mentioning

146

Contrasting

Order By: Relevance

“…This suggests that these NWs could provide light path and polarization control. In particular, they could enable a completely new approach for chiral sensing in the form of hot electron Schottky photodetector [40] exploiting the circular polarization dependent plasmonic absorption at GaAs-Au interface.…”

Section: Maximum CD At Opposite Incidence Anglesmentioning

confidence: 99%

Evidence of Optical Circular Dichroism in GaAs‐Based Nanowires Partially Covered with Gold

Leahu

Petronijevic

Belardini

et al. 2017

Advanced Optical Materials

View full text Add to dashboard Cite

thus paves the way for the important applications spreading from negative refraction, [1][2][3] chiral sensing [4,5] to production of optical field carrying out optical angular momentum for quantum information applications. [6] It has been shown that plasmonic nanostructures forming 1D [7] elements, 2D metasurfaces, [8][9][10] and 3D metamaterials [11] can exhibit linear chiral response due to their own, intrinsic chirality. Also semiconductor nanostructures can exhibit chiral features. [12][13][14][15][16] From the optical point of view, chiral structures possess the ability to rotate the plane of the polarization of electromagnetic waves (optical activity), and give rise to circular dichroism-i.e., the difference in the absorption of right-and lefthanded circular polarized light.Apart from 3D chiral objects, the possibility to obtain optical chirality, i.e., optical activity, with nonchiral elements was studied in the past, [17] but only recently reconsidered. [18,19] This phenomenon is obtained when the experimental configuration composed by both the nonchiral object and the optical incident field is nonsuperimposable on its mirror image. [20] This is called "extrinsic" chirality; in our previous works we have investigated this type of chirality in tilted golden nanowires by means of both linear (reflection and absorption) and nonlinear (second harmonic generation) measurements. [20][21][22][23] III-V semiconductor nanowires (NWs) have been widely investigated since they exhibit good waveguiding properties thus offering a light manipulation at nanoscale. Coupling of the incident light to the discrete leaky waveguide modes above the bandgap in NWs leads to increased resonant absorption, thus paving the way for important applications such as energy harvesting, spectral selectivity, lasing, spin angular momentum generation, etc. [24][25][26][27] Metallic NWs have also been investigated for plasmonic laser applications [28][29][30] and possibility of surface plasmon polaritons excitation. [31] One step further is the partial covering of such NWs with gold: this can induce, along with the proper experiment setup, the symmetry breaking which leads to chiral response.In this paper, for the first time to our knowledge, we report on a circular dichroism behavior from semiconductor hexagonal Semiconductor nanostructures hybridized with metals have been known to offer new opportunities in nonlinear optics, plasmonics, lasing, biosensors; among them GaAs-based nanowires (NWs) hybridized with gold can offer new functionalities, as chiral sensing and light manipulation, as well as circular polarization sources. This study investigates GaAs-AlGaAs-GaAs NWs fabricated by self-catalyzed growth on Si substrates, and partially covered with gold, thus inducing the symmetry breaking and a potential chiral response. Three different samples are investigated, each of them with a different morphology, as the length and the overall diameter ranging from 4.6 to 5.19 µm and from 138 up to 165 nm, respectively. The samples are first char...

show abstract

Section: Maximum CD At Opposite Incidence Anglesmentioning

confidence: 99%

Evidence of Optical Circular Dichroism in GaAs‐Based Nanowires Partially Covered with Gold

Leahu

Petronijevic

Belardini

et al. 2017

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…It was claimed that these "hot" carriers couple to the reactants, and reduce further the activation energy of the favourable reaction pathways, as a function of their number density (hence, as a function of the incoming light intensity). Although this explanation is at odds with a conventional calculation based on the Fermi golden rule (see discussion in [4]), this description became popular and formed the basis to the emerging field of plasmonic-assisted photo-catalysis, see e.g., [5][6][7][8][9] for some recent reviews. However, the relative importance of thermal and non-thermal effects remained an issue under debate.…”

Section: Introductionmentioning

confidence: 99%

Thermal effects – an alternative mechanism for plasmon-assisted photocatalysis

2020

View full text Add to dashboard Cite

Recent experiments claimed that the enhancement of catalytic reaction rates occurs via the reduction of activation barriers driven by non-equilibrium ("hot") electrons in plasmonic metal nanoparticles. These experiments place plasmonic photo-catalysis as a promising path for enhancing the efficiency of various chemical reactions. Here, we argue that what appears to be photo-catalysis is in fact thermo-catalysis, driven by the well-known plasmon-enhanced ability of illuminated metallic nanoparticles to serve as heat sources. Specifically, we point to some of the most important papers in the field, and show that a simple theory of illumination-induced heating can explain the extracted experimental data to remarkable agreement, with minimal to no fit parameters. We further show that any small temperature difference between the photocatalysis experiment and a control experiment performed under uniform external heating is effectively amplified by the exponential sensitivity of the reaction, and very likely to be interpreted incorrectly as "hot" electron effects.

show abstract

“…Experimental demonstrations of faster chemistry in the presence of illuminated metal nanoparticles have sparked a great deal of interest among researchers in the fields of nanoplasmonics, nanophotonics, and chemistry [7][8][9][10][11]. Early works associated these effects with 2 non-thermal carriers (having energies high above the Fermi energy, see Fig.…”

Section: Introductionmentioning

confidence: 99%

Eppur Si Riscalda - and yet, It (Just) Heats Up: Further Comments on “Quantifying Hot Carrier and Thermal Contributions in Plasmonic Photocatalysis”

Sivan¹,

Baraban²

2019

Preprint

View full text Add to dashboard Cite

Our Comment [1] (as well as Ref. [2], and the supporting theoretical studies [3, 4]) on recent attempts to distinguish thermal and non-thermal ("hot carrier") contributions to plasmon-assisted photocatalysis [5] initiated a re-evaluation process of previous literature on the topic within the nano-plasmonics and chemistry communities. The Response of Zhou et al. [6] attempts to defend the claims of the original paper [5].In this manuscript, we show that the Response [6] presents additional data that further validates our central criticism: inaccurately measured temperatures (that are lower than the actual temperature of the catalyst) led Zhou et al. to incorrectly claim conclusive evidence of non-thermal effects. We identify flaws in the experimental setup (e.g. the use of the default settings for the thermal camera and incorrect positioning of the thermometer) that may have led Zhou et al. to make such claims. We further show that the Response contains several factual errors and does not address the technical problems we identified with the data acquisition in [5]. We demonstrate that both the Response [6] and the original paper [5] contain additional faults, for example, in the power determination and in the normalization of the rate to the catalyst volume, and exhibit misconceptions regarding the thermo-optic response of metal nanostructures. The burden of proof required by the proposal of a novel physical mechanism has simply not been met, especially when the existing data can be modeled exquisitely by conventional theory.

show abstract

Harvesting the loss: surface plasmon-based hot electron photodetection

Cited by 215 publications

References 166 publications

Evidence of Optical Circular Dichroism in GaAs‐Based Nanowires Partially Covered with Gold

Evidence of Optical Circular Dichroism in GaAs‐Based Nanowires Partially Covered with Gold

Thermal effects – an alternative mechanism for plasmon-assisted photocatalysis

Eppur Si Riscalda - and yet, It (Just) Heats Up: Further Comments on “Quantifying Hot Carrier and Thermal Contributions in Plasmonic Photocatalysis”

Contact Info

Product

Resources

About