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Proceedings Paper

Probing the near fields of plasmonic and 2D materials with photo-induced gradient force imaging (Conference Presentation)

Paper Abstract

Nanophotonic systems such as plasmonic and 2-D materials and metamaterials serve as excellent platforms to study and control several optical and chemical phenomena such as spontaneous emission, absorption, Raman scattering and photocatalysis. Techniques such as atomic force microscopy and scanning electron microscopy enable the imaging of nanoscale features, while other techniques such as scanning tunneling microscopy and scanning near-field optical microscopy, enable the near-field optical characterization of nanoscale materials. However, most of these techniques do not allow for simultaneous imaging of topographical features and spectroscopic characterization with high spectral selectivity and temporal resolution. Here, we make use a new imaging technique called photo-induced force microscopy [1,2], which enables imaging and optical characterization of nanoscale materials with very high spatial and temporal resolution. In this technique, a nanoscale tip is brought in the vicinity of the sample, which is optically excited. The photo-induced gradient forces between the tip and the sample can be detected with nanometer-scale spatial resolution, along with topographical information, akin to an atomic force microscope. The photo-induced gradient forces, which are very sensitive to polarization and the distance of the tip from the sample, can be read out and converted to electric fields [2]. As a proof-of-concept demonstration, we image the transverse and longitudinal resonances in gold nanorods and compare their field enhancements to gap plasmons of gold dimers. [1] J. Jahng et al. Gradient and scattering forces in photo-induced force microscopy. Phys. Rev. B 90, 155417 (2014). [2] F. Huang et. al., Imaging nanoscale electromagnetic near-field distributions using optical forces, Sci. Rep. 5, 10610 (2015).

Paper Details

Date Published: 26 July 2016
PDF: 1 pages
Proc. SPIE 9884, Nanophotonics VI, 988404 (26 July 2016); doi: 10.1117/12.2227967
Show Author Affiliations
Thejaswi U. Tumkur, Rice Univ. (United States)
Chloe Doiron, Rice Univ. (United States)
Benjamin Cerjan, Rice Univ. (United States)
Peter Nordlander, Rice Univ. (United States)
Naomi J. Halas, Rice Univ. (United States)
Isabell Thomann, Rice Univ. (United States)

Published in SPIE Proceedings Vol. 9884:
Nanophotonics VI
David L. Andrews; Jean-Michel Nunzi; Andreas Ostendorf, Editor(s)

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