Contrast and imaging performance in photo induced force microscopy

Optics Express
Mohammad Almajhadi, H K Wickramasinghe

Abstract

We numerically analyze PiFM's lateral and vertical (subsurface) imaging performance in the visible and IR regimes. The lateral spatial resolution and subsurface imaging capabilities are limited by the field spatial confinement near the tip apex, which is directly proportional to the excitation wavelength. In addition, we show that near-field optical force exerted on the tip due to sample molecular resonance is indeed in the detectable range. Moreover, driving sample on (off) resonance reveals high (low) contrast. The strength of the optical forces is assessed for metal (gold), polymers (Polystyrene and Polymethylmethacrylate), and solid (SiC). By increasing tip-coating thickness from 5 nm to 35 nm, the gap-field enhancement decreases to about 40%. In IR, force spectrum over an absorption band is predominantly following the real part of the polarizability, as predicted by dipole-dipole approximation.

References

Mar 3, 1986·Physical Review Letters·G BinnigC Gerber
Sep 27, 2000·Physical Review Letters·R Hillenbrand, F Keilmann
Jan 5, 2002·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·J L BohnA Gallagher
Sep 30, 1994·Science·C D FrisbieC M Lieber
Sep 23, 2010·Applied Physics Letters·I RajapaksaH Kumar Wickramasinghe
Nov 17, 2011·Applied Physics Letters·I Rajapaksa, H Kumar Wickramasinghe
Jun 16, 2015·Scientific Reports·Fei HuangH Kumar Wickramasinghe
Dec 15, 2016·Nano Letters·Thejaswi U TumkurIsabell Thomann

❮ Previous
Next ❯

Citations

Dec 13, 2019·Proceedings of the National Academy of Sciences of the United States of America·Junghoon JahngEun Seong Lee
Mar 7, 2019·Light, Science & Applications·Antonio AmbrosioFederico Capasso
Apr 3, 2019·Sensors·Junghoon JahngEun Seong Lee
Feb 13, 2021·Analytical Chemistry·Haomin WangXiaoji G Xu
Mar 3, 2021·The Review of Scientific Instruments·Sarath PatabendigedaraSimon Martin Clark
Aug 7, 2018·Nano Letters·Brian T O'CallahanMarkus B Raschke
Sep 24, 2019·Analytical Chemistry·Le WangXiaoji G Xu

❮ Previous
Next ❯

Related Concepts

Related Feeds

Cell Imaging in CNS

Here is the latest research on cell imaging and imaging modalities, including light-sheet microscopy, in the central nervous system.