Photothermal imaging of individual carbon nanofibers with optical microresonators

Kevin D. Heylman; Kassandra A. Knapper; Erik H. Horak; Randall H. Goldsmith

doi:10.1117/12.2080056

9 March 2015 Photothermal imaging of individual carbon nanofibers with optical microresonators

Kevin D. Heylman, Kassandra A. Knapper, Erik H. Horak, Randall H. Goldsmith

Proceedings Volume 9331, Single Molecule Spectroscopy and Superresolution Imaging VIII; 93310G (2015) https://doi.org/10.1117/12.2080056
Event: SPIE BiOS, 2015, San Francisco, California, United States

Abstract

A new method is described for measuring the absorption of light by single non-emissive nanoparticles. Individual carbon nanofibers are imaged using a photonic transducer to quantify the heat dissipated after the electronic energy is thermalized. Leveraging the high sensitivity of ultrahigh-quality-factor optical microresonators as photothermal transducers provides high sensitivity. Polarization-resolved measurements indicate that the orientation of the absorption dipole of a nanofiber matches the long axis of the fiber. The per-atom absorption cross-section is determined to be (2.9 x 10^-18 cm² /carbon atom), in close agreement with the value for bulk graphite.

Citation Download Citation

Kevin D. Heylman, Kassandra A. Knapper, Erik H. Horak, and Randall H. Goldsmith "Photothermal imaging of individual carbon nanofibers with optical microresonators", Proc. SPIE 9331, Single Molecule Spectroscopy and Superresolution Imaging VIII, 93310G (9 March 2015); https://doi.org/10.1117/12.2080056

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KEYWORDS

Nanofibers

Carbon

Absorption

Microresonators

Nanoparticles

Particles

Polarization

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