Article Chiral Plasmonic Surface Temperature Switching by Several Tens of Kelvins in Titanium Nitride Nanostructures

Kenji Setoura ORCID ; Tomoya Oshikiri ORCID ; Mamoru Tamura ORCID ; Ken Morita ; Hideki Fujiwara ; Satoshi Ishii SAMURAI ORCID ; Yusuke Fujii ; Yasutaka Matsuo ORCID ; Takuya Iida ORCID ; Kohei Imura ORCID

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Kenji Setoura, Tomoya Oshikiri, Mamoru Tamura, Ken Morita, Hideki Fujiwara, Satoshi Ishii, Yusuke Fujii, Yasutaka Matsuo, Takuya Iida, Kohei Imura. Chiral Plasmonic Surface Temperature Switching by Several Tens of Kelvins in Titanium Nitride Nanostructures. Nano Letters. 2026, 26 (1), 351-357. https://doi.org/10.1021/acs.nanolett.5c05212

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(abstract)

The strong asymmetric optical response of plasmonic metal nanostructures to right- and left-handed circularly polarized light has attracted great interest in nanotechnology. However, when considering heat generation in these structures, the surface temperature distribution becomes nearly isothermal regardless of which handedness of circularly polarized light is used. This is because of the high thermal conductivity of noble metals and the diffusive nature of heat transfer. In this study, we experimentally show that the surface temperature patterns of chiral plasmonic nanostructures made from titanium nitride, which has a thermal conductivity less than 10% that of gold, become clearly different under right- and left-circularly polarized light, with the temperature contrast reaching several tens of kelvins. This temperature switching allows nanoscale spatial control of photothermal chemical reactions. Our findings suggest a significant potential for shaping nanoscale temperature distributions in the field of thermoplasmonics.

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Keyword: Plasmonic heating, Chiral plasmonics, Circular dichroism, Thermoplasmonics, Refractory plasmonics

Date published: 2026-01-14

Publisher: American Chemical Society (ACS)

Journal:

  • Nano Letters (ISSN: 15306984) vol. 26 issue. 1 p. 351-357

Funding:

  • Ministry of Education, Culture, Sports, Science and Technology JPMXP1225HK0024
  • Japan Society for the Promotion of Science JP22H05131
  • Japan Society for the Promotion of Science JP22H05136
  • Japan Society for the Promotion of Science JP23H01825
  • Japan Society for the Promotion of Science JP23H01916
  • Japan Society for the Promotion of Science JP23H01927
  • Japan Society for the Promotion of Science JP23K04561
  • Japan Society for the Promotion of Science JP24K08282
  • Japan Society for the Promotion of Science JP24K21723
  • Japan Society for the Promotion of Science JP25H00421
  • Japan Society for the Promotion of Science JP25H00828
  • Japan Society for the Promotion of Science JP25H01627
  • Japan Society for the Promotion of Science JP25H01633
  • Japan Society for the Promotion of Science JP25H01637
  • Japan Society for the Promotion of Science JP25K22238
  • Japan Science and Technology Corporation JPMJFR2139
  • Japan Science and Technology Corporation JPMJMI21G1

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1021/acs.nanolett.5c05212

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Updated at: 2026-02-10 16:30:22 +0900

Published on MDR: 2026-02-10 12:38:56 +0900

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