Single-Pixel, Picometer Scale Spectral Characterization of Light Through Scattering Media

Kürekci Ş., Yüce E.

16th Nanoscience & Nanotechnology Conference, Ankara, Turkey, 5 - 08 September 2022

  • Publication Type: Conference Paper / Unpublished
  • City: Ankara
  • Country: Turkey
  • Middle East Technical University Affiliated: Yes


Nanoscale (sub-wavelength) imaging has various applications in nanostructures such as cells and biomolecules. Controlling the wavefront of light traveling through a scattering medium having sub-wavelength spatial modes may result in sub-wavelength focusing, which may be used in nanoscale imaging. Single-pixel imaging is another preferred technique in nanophotonics applications seeking low-cost production and compactness. In this study, we propose a single-pixel multimode fiber spectrometer with picometer scale resolution by controlling the light via wavefront modulation. We use a spatial light modulator (SLM) to focus individual wavelengths at the distal end of the fiber. The calibration of the spectrometer is done by exploiting the sensitive response of multimode fiber to variations in the wavelength. The calibrated data is later used to successfully reconstruct unknown arbitrary input spectra. The technique developed in this study can be used in nanoscale spectral characterization, investigation of scattering nanostructures, and sub-wavelength imaging.