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Title: Development of time-domain differential Raman for transient thermal probing of materials

Journal Article · · Optics Express
DOI:https://doi.org/10.1364/OE.23.010040· OSTI ID:1200896
 [1];  [1];  [2];  [3];  [1]
  1. Iowa State Univ., Ames, IA (United States)
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  3. Wuhan Univ. of Technology, Wuhan (China)

A novel transient thermal characterization technology is developed based on the principles of transient optical heating and Raman probing: time-domain differential Raman. It employs a square-wave modulated laser of varying duty cycle to realize controlled heating and transient thermal probing. Very well defined extension of the heating time in each measurement changes the temperature evolution profile and the probed temperature field at μs resolution. Using this new technique, the transient thermal response of a tipless Si cantilever is investigated along the length direction. A physical model is developed to reconstruct the Raman spectrum considering the temperature evolution, while taking into account the temperature dependence of the Raman emission. By fitting the variation of the normalized Raman peak intensity, wavenumber, and peak area against the heating time, the thermal diffusivity is determined as 9.17 × 10⁻⁵, 8.14 × 10⁻⁵, and 9.51 × 10⁻⁵ m²/s. These results agree well with the reference value of 8.66 × 10⁻⁵ m²/s considering the 10% fitting uncertainty. The time-domain differential Raman provides a novel way to introduce transient thermal excitation of materials, probe the thermal response, and measure the thermal diffusivity, all with high accuracy.

Research Organization:
Idaho; Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC07-05ID14517; NE0000671
OSTI ID:
1200896
Journal Information:
Optics Express, Vol. 23, Issue 8; ISSN 1094-4087
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (2)

Non-contact T-type Raman method for measurement of thermophysical properties of micro-/nanowires journal April 2019
Comparison of thermal conductance of graphene/SiO 2 and graphene/Au interfaces based on Raman optothermal method journal September 2019

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