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Method for near-field optical imaging

Description:

Phase-less optical near-field tomography with sub-wavelength resolution in three dimensions

 

 

Inventor

John Schotland

 

Technology Overview

This invention embodies a system and method for optically imaging a sample at nanometer resolution using a position-controlled light scattered in the near field of a sample.  The extinguished power from an incident field, which illuminates both the sample and the controlled scatterer, is measured and mathematically reconstructed to form a three-dimensional image of the sample.  More specifically, there are two modalities of the proposed method that are numerically simulated.  The first modality measures the extinguished power for a set of fixed tip positions distributed volumetrically above the sample.  The second modality is specifically designed to work with an atomic force microscope (AFM) operating in tapping mode, where the tip oscillates in the vertical dimension; the data are collected as the oscillating tip scans the volume above the sample.  Most current optical imaging methods can acquire only 2D projection images, whereas this technique can provide a tomographic 3D image of the object of interest.

Caption: Experiment illustration from Govyadinov et al, 2009.  The tip scatters the incident evanescent field and modifies the interference pattern in the sample, which has dielectric susceptibility ?(r).  The power P extinguished from the illuminating field is measured as the tip is scanned on a 3D grid in the near zone of the sample.

 

Advantages

•       3D tomography at sub-wavelength resolution of thin samples

•       Can be integrated with existing near-field microscopy equipment

 

Applications

•       High-resolution tomography

•       Atomic force microscopy

•       Study nanostructures and molecular structures

•       Inspection of semiconductor devices

•       Assessment of biological samples

 

 

 

Stage of Development

•       Feasibility testing; generation of tomographic image slices 

Intellectual Property

USSN 8,695,109 

Reference Media

Govyadinov AA et al.  Phys. Rev. Lett., 2009, 103, 213901.

 

Desired partnerships

• License

 

 

Download PDF

 

Docket #  W5458 


Patent Information:
For Information, Contact:
Pamela Beatrice
Director, SEAS/SAS Licensing Group
University of Pennsylvania
215-573-4513
beatricp@upenn.edu
Inventors:
John Schotland
Keywords: