Spatially-resolved random-access pump-probe microscopy based on binary holography
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AbstractIn this letter, we present a spatially-resolved pump-probe microscope based on a digital micromirror device (DMD). The microscope system enables the measurements of ultrafast transient processes at arbitrarily selected regions in a 3-D specimen. To achieve random-access scanning, the wavefront of the probe beam is modulated by the DMD via binary holography. By switching the holograms stored in the DMD memory, laser focus can be rapidly moved in space in a discrete fashion. The microscope system has a field of view of 65 × 130 × 155 µm3 in the x, y, z axes respectively; and a scanning speed of 8 kHz which is limited by the response time of the lock-in amplifier. To demonstrate the pump-probe system, we measured the ultrafast transient reflectivity of 2-D gold patterns on a silicon substrate and on silicon nitride cantilever beams. The results show excellent signal-to-noise ratio and spatial-temporal resolution as well as the 3-D random scanning capability. The new pump-probe microscope is a versatile instrument to characterize ultrafast 3-D phenomena with high spatial and temporal resolution, e.g., propagation of localized surface plasmon resonance on curved surfaces.
Acceptance Date26/07/2019
All Author(s) ListChenyang Wen, Fu Feng, Mindan Ren, Michael G. Somekh, Ni Zhao, Shih-Chi Chen
Journal nameOptics Letters
Volume Number44
Issue Number16
Place of PublicationUSA
Pages4083 - 4086
LanguagesEnglish-United States
Keywordsrandom-access, pump-probe microscopy, DMD

Last updated on 2020-11-10 at 01:03