Novel semiconductor-laser-integrated active AFM optical probe with ultrashort pulses and nanoscale aperture

Fei-Hung Chu; Gennady A. Smolyakov; Kevin J. Malloy; Alexander A. Ukhanov

doi:10.1117/12.2606058

2 March 2022 Novel semiconductor-laser-integrated active AFM optical probe with ultrashort pulses and nanoscale aperture

Fei-Hung Chu, Gennady A. Smolyakov, Kevin J. Malloy, Alexander A. Ukhanov

Author Affiliations +

Proceedings Volume 11967, Single Molecule Spectroscopy and Superresolution Imaging XV; 1196707 (2022) https://doi.org/10.1117/12.2606058
Event: SPIE BiOS, 2022, San Francisco, California, United States

Abstract

Optical characterization at the nanoscale currently requires instruments such as NSOM/TERS, or hybrid AFM with specialized far-field optical microscopes that are quite complicated and do not provide any time-resolved data. We have demonstrated a novel class of probes for Scanning Probe Microscopy (SPM) - an Ultrafast Pulsed Atomic Force Microscopy Optical Probe (UFP AAOP) that will enhance characterization capabilities at the nanoscale and provide an exciting opportunity for obtaining both space- and time-resolved chemical information simultaneously. In the UFP AAOP design, a two-section quantum-dot mode-locked laser is monolithically integrated with an SPM probe fabricated from GaAs, with a nanoscale opening at the apex of the tip as the output aperture. With UFP AAOP, the light is supplied through the tip; hence, there is no scattered far-field light and thus significantly reduced background. Furthermore, the difficulties associated with laser alignment onto the tip and with imaging the signal onto a detector are avoided with the UFP AAOP. The UFP AAOP provides pulses with less than 4 ps duration and spatial resolution better than 300 nm at 1240 nm wavelength. It is potentially possible to reduce the pulse width to ~ 0.3 ps and to improve lateral resolution to ~ 1 nm. These unique optical probes will perform the functions of conventional AFM probes and simultaneously provide information about chemical properties of the sample at the nanoscale together with time-resolved spectroscopy. UFP AAOP will facilitate the creation of a new microscopy/spectroscopy instrument with combined single-molecule spatial resolution and ultrafast time-resolved capability.

Conference Presentation

Citation Download Citation

Fei-Hung Chu, Gennady A. Smolyakov, Kevin J. Malloy, and Alexander A. Ukhanov "Novel semiconductor-laser-integrated active AFM optical probe with ultrashort pulses and nanoscale aperture", Proc. SPIE 11967, Single Molecule Spectroscopy and Superresolution Imaging XV, 1196707 (2 March 2022); https://doi.org/10.1117/12.2606058

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