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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Published on: May 15, 2017

Concealing with structured light.

Jingbo Sun¹, Jinwei Zeng¹, Xi Wang¹

¹Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA.

Scientific Reports

|February 14, 2014

Summary

This summary is machine-generated.

Researchers demonstrate a novel cloaking method by transforming light into an optical vortex. This technique uses the vortex

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Area of Science:

Optics and Photonics
Metamaterials and Nanophotonics

Background:

Invisibility and stealth technologies have long been a subject of fascination.
Current cloaking methods face challenges like design complexity, polarization dependence, bandwidth limitations, losses, and physical constraints, especially at optical frequencies.

Purpose of the Study:

To present an alternative method for concealing macroscopic objects by manipulating light.
To utilize the dark core of an optical vortex beam for hiding objects.

Main Methods:

Structuring incident light into an optical vortex beam with a central dark core.
Positioning macroscopic objects within the dark core of the vortex beam to render them concealed.
Restoring the beam to its original Gaussian shape after passing the object, with minimal amplitude and phase distortions.

Main Results:

Demonstration of a cloaking approach using structured light (optical vortex).
The method is polarization-independent, easy to fabricate, and lossless.
Effective operation observed at wavelengths ranging from 560 to 700 nm.

Conclusions:

The proposed method offers a practical way to cloak macroscopic objects that fit within the vortex core.
This technique overcomes several limitations of existing stealth and cloaking technologies.