Femtosecond optical imaging of nanostructures using ultrafast ultramicroscopy (Conference Presentation)

Mohamed El Kabbash; Chunlei Guo; Ranran Fang; Subhash Singh

doi:10.1117/12.2528336

9 September 2019 Femtosecond optical imaging of nanostructures using ultrafast ultramicroscopy (Conference Presentation)

Mohamed El Kabbash, Chunlei Guo, Ranran Fang, Subhash Singh

Author Affiliations +

Proceedings Volume 11088, Optical Sensing, Imaging, and Photon Counting: From X-Rays to THz 2019; 110880F (2019) https://doi.org/10.1117/12.2528336
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States

Abstract

Imaging transient dynamics of materials and light-matter interaction at the nanoscale is of great interest to the study of condensed phase dynamics and to the field of nano-photonics. However, optical interrogation of the ultrafast dynamics of nanostructures has not been demonstrated as they are diffraction limited. Furthermore, optical methods are limited due to the low scattering of nanostructures and the strong background reflection. Accordingly, The ultrafast imaging of laser induced nanostructure melting was demonstrated via femtosecond x-ray diffraction imaging which provided relatively high temporal (~10 ps) and high spatial (~10 nm) resolution. However, this technique suffers from the inherent difficulty of using a femtosecond X-ray laser source and the damaging nature of the femtosecond X-ray laser probe required for single-shot imaging. Consequently, X-ray pump-probe imaging was never used to image the re-solidification dynamics of surface structures. On the other hand, cryo-electron microscopy achieved sub-nanometer resolution for single particles, however, it requires experiments to be performed in vacuum with highly specialized and costly instrumentation. Here, we we employ a time-resolved variant of ultramicroscopy that we recently developed to study the ultrafast dynamics of laser ablated surfaces. The technique is non-destructive and allows us to compare the transient image with the initial/final image. Accordingly, we determine the characteristic times for melting and re-solidification of nanostructures using optical wavelengths. We also study the formation and melting of Si nanostructures and image, for the first time, the process of non-thermal melting which occurs on the sub-picosecond time scale.

Conference Presentation

Citation Download Citation

Mohamed El Kabbash, Chunlei Guo, Ranran Fang, and Subhash Singh "Femtosecond optical imaging of nanostructures using ultrafast ultramicroscopy (Conference Presentation)", Proc. SPIE 11088, Optical Sensing, Imaging, and Photon Counting: From X-Rays to THz 2019, 110880F (9 September 2019); https://doi.org/10.1117/12.2528336

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Nanostructures

Femtosecond phenomena

Ultrafast imaging

Optical imaging

Image processing

X-ray lasers

Diffraction

Show All Keywords

Keywords/Phrases

Search In:

Publication Years