Achieving sub-diffraction spatial resolution using combined Fourier transform spectroscopy and nonlinear optical microscopy
Abstract
Fourier transform nonlinear optical microscopy is used to perform nonlinear spectroscopy of single gold nanorods in an imaging platform, which enables sub-diffraction spatial resolution. The nonlinear optical signal is detected as a function of the time delay between two phase-locked pulses, forming an interferogram that can be used to retrieve the resonant response of the nanoparticles. Detection of the nonlinear signal through a microscopy platform enables wide-field hyperspectral imaging of the longitudinal plasmon resonances in individual gold nanorods. Super-resolution capabilities are demonstrated by distinguishing multiple nanorods that are co-located within the optical diffraction limit and are spatially separated by only tens of nanometers. The positions and resonance energies obtained through Fourier transform nonlinear optical microscopy agree with the relative positions and aspect ratios deduced from electron microscopy.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 10, 2022
- Source ID
- 10.1063/5.0069944
Entities
People
- Kenneth L. Knappenberger
- Megan A Steves
Organizations
- Air Force Office of Scientific Research
- National Science Foundation
- Pennsylvania State University