k-Space Hyperspectral Imaging by a Birefringent Common-Path Interferometer.

Area of Science:

• Photonics and optical materials science.
• Advanced spectroscopic imaging techniques.

Background:

• Fourier-plane microscopy analyzes angular optical responses of materials and devices.
• Optical microcavities exhibit energy-momentum dispersions vital for research and applications.
• Standard methods for k-space analysis are time-consuming and require precise alignment.

Purpose of the Study:

• To introduce a novel k-space hyperspectral microscope for efficient optical characterization.
• To overcome limitations of standard spectroscopic techniques in measuring k-space.
• To enable detailed analysis of angle- and wavelength-dependent optical properties.

Main Methods:

• Development of a k-space hyperspectral microscope utilizing a common-path birefringent interferometer.
• Imaging of photoluminescent organic microcavities to obtain angle- and wavelength-resolved data.
• Reconstruction of 3D energy-momentum space maps from single measurements.

Main Results:

• Achieved exceptional angular and spectral resolution in a single measurement.
• Successfully mapped the 3D cavity dispersion, revealing polarization-dependent resonant modes.
• Characterized the angular and spectral behavior of an anapole mode in a dielectric nanodisk metasurface.

Conclusions:

• The developed technique provides a comprehensive optical characterization method.
• This approach is crucial for advancing fields like topological photonics and optical metamaterials.
• Enables detailed study of materials and devices with complex angle-/wavelength-dependent properties.