Microscopy with undetected photons in the mid-infrared

Area of Science:

• Quantum optics and imaging
• Mid-infrared (IR) microscopy
• Biomedical imaging techniques

Background:

• Mid-infrared (IR) microscopy provides unique biochemical specificity for biomedical and industrial applications.
• Current mid-IR detection methods are limited by inferior technical capabilities and high costs.
• A need exists for advanced detection technologies to unlock the full potential of mid-IR microscopy.

Purpose of the Study:

• To demonstrate nonlinear interferometry with entangled light as a powerful tool for mid-IR microscopy.
• To enable mid-IR imaging using only near-IR detection, thereby reducing cost and complexity.
• To assess the suitability of this quantum imaging technique for biological tissue analysis.

Main Methods:

• Experimental implementation of nonlinear interferometry utilizing entangled light.
• Utilized near-IR detection with a standard silicon-based camera.
• Performed widefield imaging across a broad mid-IR wavelength range (3.4–4.3 μm).

Main Results:

• Achieved a spatial resolution of 35 μm for images with 650 resolved elements.
• Demonstrated successful widefield imaging in the mid-IR spectral range.
• Acquired microscopic images of biological tissue samples using the developed technique.

Conclusions:

• Nonlinear interferometry with entangled light offers a cost-effective and technically superior alternative for mid-IR microscopy.
• The technique successfully images biological tissues in the mid-IR using accessible near-IR detectors.
• Quantum imaging presents a promising new avenue for advancements in life sciences and biomedical research.