Near-field scanning optical microscopy of single molecules by femtosecond two-photon excitation

1998 ◽  
Vol 23 (14) ◽  
pp. 1111 ◽  
Author(s):  
Michael K. Lewis ◽  
Peter Wolanin ◽  
Ari Gafni ◽  
Duncan G. Steel
Keyword(s):  
Optical Microscopy ◽  
Near Field ◽  
Single Molecules ◽  
Two Photon ◽  
Photon Excitation ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning ◽  
Two Photon Excitation

Near-Field Scanning Optical Microscopy: Single Channel Imaging of Selected Gold Nanoparticles through Two Photon Induced Photoluminescence

2014 ◽  
Vol 938 ◽  
pp. 118-122 ◽  
Author(s):  
Mohammad Kamal Hossain ◽  
Masahiro Kitajima ◽  
Kohei Imura ◽  
Hiromi Okamoto
Keyword(s):  
Gold Nanoparticles ◽  
Optical Microscopy ◽  
Near Field ◽  
Fdtd Simulation ◽  
Local Geometry ◽  
Optical Confinement ◽  
Two Photon ◽  
Em Field ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

Near-field scanning optical microscopy (NSOM) is known to be a technique of choice to investigate nanometric materials and their properties beyond far-field diffraction limit resulting high spatial, spectral and temporal resolution. Here in this report, a state of art facility, aperture-NSOM was used to probe single nanoparticle, dimer, trimer and small nanoaggregate of gold nanoparticles. Shear force topography and two photon induced photoluminescence (TPI-PL) images captured simultaneously by the system facilitated to clarify the correlation between the local geometry and the emitted photon of TPI-PL. Small gold aggregates including trimer showed strong optical confinement of TPI-PL with reference to that of single gold nanoparticles. It was also evident that the interparticle gap does have a great influence in localized electromagnetic (EM) field mediated optical confinement of TPI-PL. Such observations were also supported by finite different time domain (FDTD) analysis keeping the simulation parameter nearly identical to that of experiment. FDTD simulation demonstrated that incident excitation parallel to the interparticle axis induces strong near-field distribution at the interstitials whereas out of plane excitation modifies such confinement depending on the nanometric geometry of the nanoaggregates. Such an observation is indispensable to understand the localized EM field-mediated optical confinement in surface-enhanced spectroscopy.

Enhanced Emission from Single Isolated Gold Quantum Dots Investigated Using Two-Photon-Excited Fluorescence Near-Field Scanning Optical Microscopy

2016 ◽  
Vol 138 (50) ◽  
pp. 16299-16307 ◽  
Author(s):  
Neranga Abeyasinghe ◽  
Santosh Kumar ◽  
Kai Sun ◽  
John F. Mansfield ◽  
Rongchao Jin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Microscopy ◽  
Near Field ◽  
Two Photon ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

Apertureless Near-Field Scanning Optical Microscopy of Single Molecules

Nano Letters ◽  
2004 ◽  
Vol 4 (7) ◽  
pp. 1329-1332 ◽  
Author(s):  
Vladimir V. Protasenko ◽  
Alan C. Gallagher
Keyword(s):  
Optical Microscopy ◽  
Near Field ◽  
Single Molecules ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

Raman imaging with near‐field scanning optical microscopy

1995 ◽  
Vol 67 (17) ◽  
pp. 2483-2485 ◽  
Author(s):  
C. L. Jahncke ◽  
M. A. Paesler ◽  
H. D. Hallen
Keyword(s):  
Optical Microscopy ◽  
Near Field ◽  
Raman Imaging ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

Investigations of liquid crystals and liquid ambients using near-field scanning optical microscopy

1995 ◽  
Vol 61 (1-4) ◽  
pp. 291-294 ◽  
Author(s):  
Patrick J. Moyer ◽  
Stefan Kämmer ◽  
Karsten Walzer ◽  
Michael Hietschold
Keyword(s):  
Liquid Crystals ◽  
Optical Microscopy ◽  
Near Field ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning
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