2-7 June 2019
Simon Fraser University
America/Vancouver timezone
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Effect of temperature on plasmonic resonances in semiconductors and metals

3 Jun 2019, 11:00
15m
SCP 8445.2 (Simon Fraser University)

SCP 8445.2

Simon Fraser University

Oral (Non-Student) / Orale (non-étudiant(e)) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) M1-10 Materials synthesis and characterization I (DCMMP) | Synthèse et caractérisation de matériaux I (DPMCM)

Speaker

Dr Vaibhav Thakore (Department of Applied Mathematics and Center for Advanced Materials and Biomaterials Research, Western University)

Description

Plasmonically enhanced absorption or scattering of radiation on the mesoscale forms the basis of promising applications in a wide variety of fields such as: biosensing, photothermal therapy, photocatalysis, solvothermal chemistry, energy harvesting, magnetic recording for data storage, control of radiative heat transfer and so on. In a majority of the applications based on plasmonics, the noble metals - gold (Au) and silver (Ag) - have been the materials of choice. However, it is also now widely acknowledged that these materials suffer from problems of poor thermal and chemical stability accompanied by significant dissipative losses under high-temperature conditions. These issues have thus prompted a quest for materials with better thermoplasmonic properties. In this regard, semiconductor particles have lately attracted a lot of attention because they exhibit low ohmic losses, are thermochemically more stable, and exhibit highly tunable plasmonic resonances through bandgap engineering, control over dopant concentration and dielectric environment. Here, we will present results from our recent work on the multiscale modeling of plasmonically enhanced control of heat radiation using semiconductor inclusions [1, 2]. Furthermore, a comparison of the size-dependent thermoplasmonic behavior of indirect and direct bandgap semiconductor particles of undoped silicon (Si) and gallium arsenide (GaAs), respectively, with the metallic (Au) particles that are characterized by a complete absence of the bandgap will also be presented [3].

References

  1. Vaibhav Thakore, Janika Tang, Kevin Conley, Tapio Ala-Nissila, Mikko
    Karttunen, Thermoplasmonic response of semiconductor nanoparticles –
    A comparison with metals, Adv. Theory Sim. 1800100, 2018.
  2. Janika Tang, Vaibhav Thakore, Tapio Ala-Nissila, Plasmonically
    enhanced reflectance of heat radiation from low-bandgap semiconductor microinclusions, Sci. Rep. 7, 5696, 2017.
  3. Kevin Conley, Vaibhav Thakore, Tapio Ala-Nissila, Plasmonically Enhanced
    Spectrally-sensitive Coatings for Gradient Heat Flux Sensors, PIERS
    2018, Toyama, Japan, August 1-4, 2018.

Primary authors

Dr Vaibhav Thakore (Department of Applied Mathematics and Center for Advanced Materials and Biomaterials Research, Western University) Ms Janika Tang (QTF Center of Excellence, Department of Applied Physics, Aalto University School of Science, Espoo, Finland) Dr Kevin Conley (QTF Center of Excellence, Department of Applied Physics, Aalto University School of Science, Finland) Dr Tapio Ala-Nissila (QTF Center of Excellence, Department of Applied Physics, Aalto University School of Science, Aalto, Espoo, Finland; Department of Physics, Brown University, Providence, Rhode Island, USA; Interdisciplinary Centre for Mathematical Modelling, Department of Mathematical Sciences, Loughborough University, Loughborough, UK) Dr Mikko Karttunen (Departments of Applied Mathematics and Chemistry; Center for Advanced Materials and Biomaterials Research, Western University, London, Ontario, Canada)

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