Cross-grating phase microscopy for nanophotonics

TL;DR

This paper introduces cross-grating phase microscopy (CGM), a high-resolution, high-sensitivity technique that extends quantitative phase microscopy to nanophotonics, enabling detailed optical property measurements and temperature imaging of nanoscale materials.

Contribution

It demonstrates how CGM can be used to determine optical properties of nanomaterials and perform temperature microscopy, expanding QPM applications into nanophotonics.

Findings

CGM provides high-resolution, high-sensitivity imaging of nanostructures.

It enables measurement of optical properties of nanoparticles, 2D materials, and metasurfaces.

CGM can be used for label-free temperature imaging at the microscale.

Abstract

Quantitative phase microscopies (QPMs) have been mainly used for applications in cell biology, for around 2 decades. In this article, we show how cross-grating phase microscopy (CGM), a high-resolution, high-sensitivity QPM, recently expanded the scope of QPMs to applications in nanophotonics. In particular, this article explains how the intensity and phase images acquired by CGM can be processed to determine all the optical properties of imaged nanoparticles, 2D-materials and metasurfaces. We also explain how CGM can be used as a temperature microscopy technique. This latter imaging modality led to a large variety of works in the 2010s based on the optical heating of plasmonic nanoparticles for photothermal studies in physics, chemistry and biology at the microscale, in which label-free, microscale temperature measurements were pivotal.