We describe the optimum design of the near-field scanning optical microscope (NSOM) based on a short probe tapping mode tuning-fork (TMTF) configuration and its applications in optoelectronic characterization and optical measurements. The short probe TMTF-NSOM is constructed to operate both in collection and excitation modes, in which a cleaved short fiber probe attached to one tine of the tuning fork is used as the light collector/emitter as well as the force sensing element. Interference fringes due to standing evanescent waves generated by total internal reflection are imaged by collection mode. On the other hand, excitation mode of short probe TMTF-NSOM is applied to perform near-field surface photovoltage measurements on AlGaInP light emitting diode structures.
KEYWORDS: 3D scanning, Laser applications, 3D acquisition, Laser scanners, Cameras, Clouds, 3D metrology, Optical design, Optical testing, Data processing
This study applies 3D Laser scanning technology to develop a high-precision measuring system for digital survey of historical building. It outperformed other methods in obtaining abundant high-precision measuring points and computing data instantly. In this study, the Pei-tien Temple, a Chinese Taoism temple in southern Taiwan famous for its highly intricate architecture and more than 300-year history, was adopted as the target to proof the high accuracy and efficiency of this system. By using French made MENSI GS-100 Laser Scanner, numerous measuring points were precisely plotted to present the plane map, vertical map and 3D map of the property. Accuracies of 0.1-1 mm in the digital data have consistently been achieved for the historical heritage measurement.
KEYWORDS: Near field scanning optical microscopy, Optical fibers, Channel waveguides, Near field, Silica, Telecommunications, Near field optics, Aluminum, Physics, Optical testing
Construction of a tapping-mode tuning fork with a short fiber probe as the force sensing element for near-field scanning optical microscopy is reported. This type of near-field scanning optical microscopy provides stable and high Q factor at the tapping frequency of the tuning fork, and thus gives high quality NSOM and AFM images of samples.We present results obtained by using the short tip tapping-mode tuning fork near-field scanning optical microscopy measurements performed on a single mode telecommunication optical fiber and a silica based buried channel waveguide.
Surface plasmon excitations with different nanostructure modulations on the interface between metal and dielectric were interesting to investigate. The study was performed by measuring optical transmission through perforated metallic thin film. Experimental observations on dependences of periods, depths, and widths of nanostructures on the transmission of gold film were reported. Furthermore, simulations by finite difference time domain (FDTD) method were used to predict the variations of transmission and reflection with periods.
KEYWORDS: Near field, Near field scanning optical microscopy, Super resolution, Near field optics, Thin films, Glasses, Surface plasmons, Image transmission, Optical microscopes, Interfaces
The near-field recording mechanism of the super resolution near-field structure, glass/ZnS-SiO2/AgOx/ZnS-SiO2, has been studied experimentally. Near-field optical effects of the glass/ZnS-SiO2/AgOx/ZnS-SiO2 have been observed by a tapping mode tuning-fork near-field scanning optical microscope (TMTF-NSOM) on the transmitting light spot. Laser-excited surface plasmon at the interfaces of AgOx/ZnS-SiO2 thin film was detected by this technique. Results showed that the transmitting focused light through the AgOx type super resolution near-field structure consists of a propagating term and an evanescent one resulted from the localized surface plasmon of the AgOx thin film. A strong enhancement of the near-field intensity and the dynamic localized enhancement of the transmitting focused light were observed as well.
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