Photothermal Absorption Spectroscopy of Individual Semiconductor Nanocrystals

Abstract

Photothermal heterodyne detection is used to record the first room-temperature absorption spectra of single CdSe/ZnS semiconductor nanocrystals. These spectra are recorded in the high cw excitation regime, and the observed bands are assigned to transitions involving biexciton and trion states. Comparison with the single nanocrystals photoluminescence spectra leads to the measurement of spectral Stokes shifts free from ensemble averaging.

References in corpus (3)

• Observation of intrinsic size effects in the optical response of individual gold nanoparticles
• Photothermal heterodyne imaging of individual nonfluorescent nanoclusters and nanocrystals
• Multiexcitons confined within a sub-excitonic volume: Spectroscopic and dynamical signatures of neutral and charged biexcitons in ultrasmall semiconductor nanocrystals

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