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Related Experiment Video

Updated: Mar 2, 2026

Fabrication and Testing of Photonic Thermometers
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Resonant thermoelectric nanophotonics.

Kelly W Mauser1, Seyoon Kim1, Slobodan Mitrovic2

  • 1Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA.

Nature Nanotechnology
|May 23, 2017
PubMed
Summary

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Researchers developed novel thermoelectric nanostructures for highly sensitive, wavelength-specific photodetectors. These nanostructures enable bandgap-independent photodetection, enhancing performance for hyperspectral and broadband applications.

Area of Science:

  • Optoelectronics and Nanophotonics
  • Thermoelectric Materials
  • Photodetection Technologies

Background:

  • Conventional photodetectors rely on photocurrent generation or bolometry, often enhanced by plasmonic/nanophotonic structures.
  • Existing methods have limitations, particularly concerning bandgap dependency and spectral selectivity.

Purpose of the Study:

  • To introduce subwavelength thermoelectric nanostructures for resonant, spectrally selective absorption.
  • To demonstrate a bandgap-independent photodetection mechanism using localized temperature gradients.
  • To explore applications in hyperspectral and broadband photodetectors.

Main Methods:

  • Design and fabrication of subwavelength thermoelectric nanostructures.
  • Integration of resonant absorption and thermoelectric junctions within a suspended membrane.

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  • Characterization of wavelength-specific detection and responsivity using materials like bismuth telluride/antimony telluride and chromel/alumel.

    • Main Results:

    • Achieved wavelength-specific detection with tunable resonant absorption.
    • Demonstrated high input power responsivity up to 38 V/W and a bandwidth of nearly 3 kHz.
    • Showcased a bandgap-independent photodetection mechanism.

    Conclusions:

    • Subwavelength thermoelectric nanostructures offer a promising route for advanced photodetector designs.
    • These resonant nanophotonic thermoelectric materials are suitable for non-bandgap-limited hyperspectral and broadband optoelectronic applications.
    • The developed approach enhances photodetection performance independent of material bandgap.