Metallic tip probe providing high intensity and small spot size with a small background light in near-field optics

2005 ◽  
Vol 87 (15) ◽  
pp. 151116 ◽  
Author(s):  
Kazuo Tanaka ◽  
Masahiro Tanaka ◽  
Tatsuhiko Sugiyama
Keyword(s):  
High Intensity ◽  
Near Field ◽  
Spot Size ◽  
Background Light ◽  
Near Field Optics ◽  
Small Spot

Ultra-spatially resolved synchrotron powered FT-IR microspectroscopy of individual cells of biological material

1995 ◽  
Vol 53 ◽  
pp. 884-885
Author(s):  
David L. Wetzel ◽  
John A. Reffner ◽  
Gwyn P. Williams
Keyword(s):  
Thermal Noise ◽  
Spot Size ◽  
Acquisition Time ◽  
Thermal Source ◽  
Signal To Noise ◽  
Spatially Resolved ◽  
Good Spatial Resolution ◽  
Small Spot ◽  
Ft Ir ◽  
Ir Microspectroscopy

Synchrotron radiation is 100 to 1000 times brighter than a thermal source such as a globar. It is not accompanied with thermal noise and it is highly directional and nondivergent. For these reasons, it is well suited for ultra-spatially resolved FT-IR microspectroscopy. In efforts to attain good spatial resolution in FT-IR microspectroscopy with a thermal source, a considerable fraction of the infrared beam focused onto the specimen is lost when projected remote apertures are used to achieve a small spot size. This is the case because of divergence in the beam from that source. Also the brightness is limited and it is necessary to compromise on the signal-to-noise or to expect a long acquisition time from coadding many scans. A synchrotron powered FT-IR Microspectrometer does not suffer from this effect. Since most of the unaperatured beam’s energy makes it through even a 12 × 12 μm aperture, that is a starting place for aperture dimension reduction.

Simultaneous observation of light localization and confinement in near-field optics

2001 ◽  
Vol 56 (4) ◽  
pp. 517-522 ◽  
Author(s):  
D Peyrade ◽  
R Quidant ◽  
J.-C Weeber ◽  
A Dereux ◽  
G Lévêque ◽  
...  
Keyword(s):  
Near Field ◽  
Simultaneous Observation ◽  
Near Field Optics ◽  
Light Localization

Image contrast in near‐field optics

1992 ◽  
Vol 71 (10) ◽  
pp. 4659-4663 ◽  
Author(s):  
J. K. Trautman ◽  
E. Betzig ◽  
J. S. Weiner ◽  
D. J. DiGiovanni ◽  
T. D. Harris ◽  
...  
Keyword(s):  
Near Field ◽  
Image Contrast ◽  
Near Field Optics
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