Three-Dimensional Ir Imaging With Uncooled Gan Photodiodes Using Nondegenerate Twophoton Absorption

Abstract

We utilize the recently demonstrated orders of magnitude enhancement of extremely nondegenerate two-photon absorption in directgap semiconductor photodiodes to perform scanned imaging of threedimensional (3D) structures using IR femtosecond illumination pulses (1.6 μm and 4.93 μm) gated on the GaN detector by sub-gap, femtosecond pulses. While transverse resolution is limited by the usual imaging criteria, the longitudinal or depth resolution can be less than a wavelength, dependent on the pulsewidths in this nonlinear interaction within the detector element. The imaging system can accommodate a wide range of wavelengths in the mid-IR and near-IR without the need to modify the detection and imaging systems.

Publication Date

1-25-2016

Publication Title

Optics Express

Volume

24

Issue

2

Number of Pages

1196-1205

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OE.24.001196

Socpus ID

84962092173 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84962092173

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