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Estimation of the proximal temperature rise of an excited upconversion particle by detecting the wavefront of emission

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2024

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Nalupurackal, Gokul
Singh, Jaspal
Roy, Srestha
Chakraborty, Snigdhadev
Goswami, Jayesh
Bhattacharya, Arijit
Sinha Mahapatra, Pallab
Ganesan, A. R.
Roy, Basudev

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Optics Express (OpEx). Optica Publishing. 2024, 32(4), S. 6011-6024. eISSN 1094-4087. Verfügbar unter: doi: 10.1364/oe.514938

Zusammenfassung

Monitoring the temperature distribution within a local environment at the micro and nanoscale is vital as many processes are solely thermal. Various thermometric techniques have been explored in the community, and out of these, fluorescent nano/micro particle-based mechanisms are accepted widely (fluorescence intensity ratio (FIR) techniques, where the ratio of populations in two consecutive energy levels is compared with Boltzmann distribution). We describe a new technique to account for the temperature rise near an illuminated upconverting particle (UCP) using wavefront imaging, which is more sensitive than the conventional thermometric techniques on the microscale. We rely on a thermo-optical phase microscopic technique by reconstructing the wavefront of emission from an upconverting particle using a Shack-Hartmann wavefront sensor. The wavefront maps the local phase distribution, which is an indicator of the surroundings’ optical parameters, particularly the suspended medium’s temperature-induced refractive index in the presence of convection currents. We describe how these extracted phase values can provide information about the optical heating due to the particle and hence its local environment along the direction of the emission. Our findings demonstrate the detection of a minimum temperature rise of 0.23 K, while the FIR methods indicate a minimum of 0.3 K rise. This technique is used to study the temperature increase in the backscattered direction for an upconverting particle illuminated on pump resonance. We also estimate the Soret coefficient for an upconverting particle optically trapped on pump resonance and experiencing anisotropic heating across the body.

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530 Physik

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ISO 690NALUPURACKAL, Gokul, Jaspal SINGH, Srestha ROY, Lokesh CHINNAKANNA MURUGA, Snigdhadev CHAKRABORTY, Jayesh GOSWAMI, Arijit BHATTACHARYA, Pallab SINHA MAHAPATRA, A. R. GANESAN, Basudev ROY, 2024. Estimation of the proximal temperature rise of an excited upconversion particle by detecting the wavefront of emission. In: Optics Express (OpEx). Optica Publishing. 2024, 32(4), S. 6011-6024. eISSN 1094-4087. Verfügbar unter: doi: 10.1364/oe.514938
BibTex
@article{Nalupurackal2024-02-12Estim-71833,
  title={Estimation of the proximal temperature rise of an excited upconversion particle by detecting the wavefront of emission},
  year={2024},
  doi={10.1364/oe.514938},
  number={4},
  volume={32},
  journal={Optics Express (OpEx)},
  pages={6011--6024},
  author={Nalupurackal, Gokul and Singh, Jaspal and Roy, Srestha and Chinnakanna Muruga, Lokesh and Chakraborty, Snigdhadev and Goswami, Jayesh and Bhattacharya, Arijit and Sinha Mahapatra, Pallab and Ganesan, A. R. and Roy, Basudev}
}
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