scholarly journals Near-Field Optical Microscope Enables Submicron Direct-Write Laser Micromachining of Diamond

MRS Bulletin ◽  
2001 ◽  
Vol 26 (10) ◽  
pp. 752-752
Author(s):  
Claudiu Muntele
Keyword(s):  
Near Field ◽  
Laser Micromachining ◽  
Optical Microscope ◽  
Direct Write

Nanometer-Scale Laser Direct-Write Using Near-Field Optics

MRS Bulletin ◽  
2007 ◽  
Vol 32 (1) ◽  
pp. 16-22 ◽  
Author(s):  
Costas P. Grigoropoulos ◽  
David J. Hwang ◽  
Anant Chimmalgi
Keyword(s):  
Structural Changes ◽  
Near Field ◽  
Target Material ◽  
Optical Microscope ◽  
Nanometer Scale ◽  
Direct Write ◽  
Feature Size ◽  
Near Field Optics ◽  
Near Field Scanning ◽  
Laser Direct Write

AbstractThis article summarizes research on laser-based processing and structuring of materials at the nanoscale using optical near-field schemes. Both apertureless and tapered fiber near-field scanning optical microscope probes can deliver highly confined irradiation at sufficiently high intensities to cause morphological and structural changes in materials at the nanometer level. The energy emitted by the probes and the absorption within the target material are predicted by carrying out calculations of the near-field electromagnetic distribution. The effects of shrinking laser beam dimensions compete with the energy diffusion into the target material. Experimental results have shown well-controlled subtractive material modification with minimum feature size in the neighborhood of 10 nm. Precise patterning can be achieved via laser-assisted chemical etching. Control of the nucleation of nanostructures via rapid melting and crystallization is demonstrated. The article concludes with an outlook to applications.

Near-field scanning optical microscopy

1986 ◽  
Vol 44 ◽  
pp. 642-643
Author(s):  
E. Betzig ◽  
A. Harootunian ◽  
M. Isaacson ◽  
A. Lewis
Keyword(s):  
Near Field ◽  
Optical Microscope ◽  
Visible Radiation ◽  
Field Methods ◽  
Optical Elements ◽  
Optical Region ◽  
Order Of Magnitude ◽  
Nondestructive Imaging ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

In general, conventional methods of optical imaging are limited in spatial resolution by either the wavelength of the radiation used or by the aberrations of the optical elements. This is true whether one uses a scanning probe or a fixed beam method. The reason for the wavelength limit of resolution is due to the far field methods of producing or detecting the radiation. If one resorts to restricting our probes to the near field optical region, then the possibility exists of obtaining spatial resolutions more than an order of magnitude smaller than the optical wavelength of the radiation used. In this paper, we will describe the principles underlying such "near field" imaging and present some preliminary results from a near field scanning optical microscope (NS0M) that uses visible radiation and is capable of resolutions comparable to an SEM. The advantage of such a technique is the possibility of completely nondestructive imaging in air at spatial resolutions of about 50nm.

scholarly journals Recent advances in characterizing the “bee” structures and asphaltene particles in asphalt binders

2020 ◽  
Vol 13 (6) ◽  
pp. 697-706
Author(s):  
Yuhong Wang ◽  
Kecheng Zhao ◽  
Fangjin Li ◽  
Qi Gao ◽  
King Wai Chiu Lai
Keyword(s):  
Near Field ◽  
Asphalt Binder ◽  
Optical Microscope ◽  
Asphalt Binders ◽  
Zero Shear Viscosity ◽  
Surface Features ◽  
Asphaltene Content ◽  
Scanning Transmission ◽  
Before And After ◽  
Binder Aging

AbstractThe microscopic surface features of asphalt binders are extensively reported in existing literature, but relatively fewer studies are performed on the morphology of asphaltene microstructures and cross-examination between the surface features and asphaltenes. This paper reports the findings of investigating six types of asphalt binders at the nanoscale, assisted with atomic force microscopy (AFM) and scanning transmission electron microscopy (STEM). The surface features of the asphalt binders were examined by using AFM before and after being repetitively peeled by a tape. Variations in infrared (IR) absorbance at the wavenumber around 1700 cm−1, which corresponds to ketones, were examined by using an infrared s-SNOM instrument (scattering-type scanning near-field optical microscope). Thin films of asphalt binders were examined by using STEM, and separate asphaltene particles were cross-examined by using both STEM and AFM. In addition, connections between the microstructures and binder’s physicochemical properties were evaluated. The use of both microscopy techniques provide comprehensive and complementary information on the microscopic nature of asphalt binders. It was found that the dynamic viscosities of asphalt binders are predominantly determined by the zero shear viscosity of the corresponding maltenes and asphaltene content. Limited samples also suggest that the unique bee structures are likely related to the growth of asphaltene content during asphalt binder aging process, but more asphalt binders from different crude sources are needed to verify this finding.

Optical constants from scattering-type scanning near-field optical microscope

2021 ◽  
Vol 118 (4) ◽  
pp. 041103
Author(s):  
Xiao Guo ◽  
Karl Bertling ◽  
Aleksandar D. Rakić
Keyword(s):  
Optical Constants ◽  
Near Field ◽  
Optical Microscope

Observation of subcellular structures of neurons by an illumination mode near-field optical microscope under an optical feedback control

1996 ◽  
Vol 3 (6) ◽  
pp. A463-A467
Author(s):  
Rajagopalan Uma Maheswari ◽  
Shuji Mononobe ◽  
Hitoshi Tatsumi ◽  
Yoshifumi Katayama ◽  
Motoichi Ohtsu
Keyword(s):  
Feedback Control ◽  
Optical Feedback ◽  
Near Field ◽  
Optical Microscope ◽  
Illumination Mode
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