Interscale Mixing Microscopy: far field imaging beyond the diffraction limit

TL;DR

Interscale mixing microscopy is a diffraction-based technique that enables far-field imaging of subwavelength objects beyond the diffraction limit by analyzing interference patterns with broadband light.

Contribution

The paper introduces an analytical framework and experimental validation for interscale mixing microscopy, allowing nanoscale object spectroscopy in the far-field.

Findings

Achieved detection of objects smaller than wavelength/10

Single measurement can determine object parameters

Enables far-field spectroscopy of nanoscale objects

Abstract

We present an analytical description and an experimental realization of interscale mixing microscopy, a diffraction-based imaging technique that is capable of detecting wavelength/10 objects in far-field measurements with both coherent and incoherent broadband light. This method aims at recovering the spatial spectrum of light diffracted by a subwavelength object based on far-field measurements of the interference created by the object and a finite diffraction grating. A single measurement, analyzing the multiple diffraction orders, is often sufficient to determine the parameters of the object. The presented formalism opens the door for spectroscopy of nanoscale objects in the far-field.