Pump-probe scanning near field optical microscopy: Sub-wavelength resolution chemical imaging and ultrafast local dynamics

2012 ◽  
Vol 100 (15) ◽  
pp. 153103 ◽  
Author(s):  
Khadga Karki ◽  
Mahesh Namboodiri ◽  
Tahir Zeb Khan ◽  
Arnulf Materny
Keyword(s):  
Optical Microscopy ◽  
Near Field ◽  
Chemical Imaging ◽  
Pump Probe ◽  
Local Dynamics ◽  
Wavelength Resolution ◽  
Sub Wavelength

Development of a Combined Scanning Ion-Conductance and Nearfield Optical Microscope to Image Living Cells

1999 ◽  
Vol 5 (S2) ◽  
pp. 976-977
Author(s):  
M. Raval ◽  
D. Klenerman ◽  
T. Rayment ◽  
Y. Korchev ◽  
M. Lab
Keyword(s):  
Optical Microscopy ◽  
Biological Samples ◽  
Near Field ◽  
Sample Surface ◽  
Optical Microscope ◽  
Ion Conductance ◽  
Simultaneous Generation ◽  
Simple Arrangement ◽  
Wavelength Resolution ◽  
Sub Wavelength

It is important to be able to image biological samples in a manner that is non-invasive and allows the sample to retain its functionality during imaging.A member of the SPM (scanning probe microscopy) family, SNOM (scanning near-field optical microscopy), has emerged as a technique that allows optical and topographic imaging of biological samples whilst satisfying the above stated criteria. The basic operating principle of SNOM is as follows. Light is coupled down a fibre-optic probe with an output aperture of sub-wavelength dimensions. The probe is then scanned over the sample surface from a distance that is approximately equal to the size of its aperture. By this apparently simple arrangement, the diffraction limit posed by conventional optical microscopy is overcome and simultaneous generation of optical and topographic images of sub-wavelength resolution is made possible. Spatial resolution values of lOOnm in air and 60nm in liquid[1,2] are achievable with SNOM.

Photoreflectance Near-Field Scanning Optical Microscopy

1999 ◽  
Vol 588 ◽  
Author(s):  
Charles Paulson ◽  
Brian Hawkins ◽  
Jingxi Sun ◽  
Arthur B. Ellis ◽  
Leon Mccaughan ◽  
...  
Keyword(s):  
Optical Microscopy ◽  
Electric Fields ◽  
Spatial Resolution ◽  
High Intensity ◽  
Near Field ◽  
And Topology ◽  
Wavelength Resolution ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning ◽  
Sub Wavelength

AbstractA novel Near-field Scanning Optical Microscopy (NSOM) technique is used to obtain simultaneous topology, photoluminescence and photoreflectance (PR) spectra. PR spectra from GaAs surfaces were obtained and the local electric fields were calculated. Sub-wavelength resolution is expected for this technique and achieved for PL and topology measurements. Photovoltages, resulting from the high intensity of light at the NSOM tip, can limit the spatial resolution of the electric field determination.

Study of Hot Spots Probing Based on Meta-Pillars Array

2019 ◽  
Vol 16 (9) ◽  
pp. 3692-3697
Author(s):  
Yisha You ◽  
Fujuan Huang ◽  
Yongqi Fu ◽  
Shaoli Zhu
Keyword(s):  
Hot Spots ◽  
Near Field ◽  
Optical Microscope ◽  
Microscopic Imaging ◽  
Secondary Sources ◽  
Imaging Application ◽  
Calculation Results ◽  
Wavelength Resolution ◽  
Near Field Scanning ◽  
Sub Wavelength

Inspired by imaging principle of near-field scanning optical microscope (NSOM), meta-pillars array is designed and analyzed on the basis of microscopic imaging application with high resolution. Finely focused spots acting as tiny secondary sources for illumination at near-field can be derived under supporting of the meta-pillars for the purpose of increasing imaging resolution. Numerical calculation is carried out on the basis of finite difference and time domain (FDTD) algorithm. Our calculation results demonstrate that the meta-pillars are capable of supporting the microscopic imaging at sub-wavelength resolution.

Enhancement of Optical Transmission Through Planar Nano-Apertures in a Metal Film

2003 ◽  
Author(s):  
Eric X. Jin ◽  
Xianfan Xu
Keyword(s):  
Metal Film ◽  
Incident Light ◽  
Near Field ◽  
Transmission Efficiency ◽  
Localized Surface Plasmon ◽  
Fabry Perot ◽  
Wavelength Resolution ◽  
Signal Contrast ◽  
Negative Role ◽  
Sub Wavelength

In this work, we investigate transmission enhancement through ridged-apertures of nanometer size in a metal film in the optical frequency range. It is demonstrated that the fundamental propagation TE10 mode concentrated in the gap between the two ridges of the aperture provides transmission efficiency higher than unity, and the size of the gap between the two ridges determines the sub-wavelength resolution. Fabry-Perot-like resonance with respect to the thickness of the aperture and the red-shift phenomena with respect to the wavelength of the incident light are observed. As a comparison, transmission through regular apertures is also computed, and is found much lower. Localized surface plasmon (LSP) is excited on the edges of the aperture in a silver film but plays a negative role with respect to the field concentration and signal contrast. With optimized geometries, the ridged apertures are capable of achieving sub-wavelength resolution in the near field with transmission efficiency above unity and high contrast.

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