4 research outputs found
Media 4: PSF shaping using adaptive optics for three-dimensional single-molecule super-resolution imaging and tracking
Originally published in Optics Express on 27 February 2012 (oe-20-5-4957
Media 2: PSF shaping using adaptive optics for three-dimensional single-molecule super-resolution imaging and tracking
Originally published in Optics Express on 27 February 2012 (oe-20-5-4957
Media 1: PSF shaping using adaptive optics for three-dimensional single-molecule super-resolution imaging and tracking
Originally published in Optics Express on 27 February 2012 (oe-20-5-4957
One-Shot Measurement of the Three-Dimensional Electromagnetic Field Scattered by a Subwavelength Aperture Tip Coupled to the Environment
Near-field
scanning optical microscopy (NSOM) achieves subwavelength
resolution by bringing a nanosized probe close to the surface of the
sample. This extends the spectrum of spatial frequencies that can
be detected with respect to a diffraction limited microscope. The
interaction of the probe with the sample is expected to affect its
radiation to the far field in a way that is often hard to predict.
Here we address this question by proposing a general method based
on full-field off-axis digital holography microscopy which enables
to study in detail the far-field radiation from a NSOM probe as a
function of its environment. A first application is demonstrated by
performing a three-dimensional (3D) tomographic reconstruction of
light scattered from the subwavelength aperture tip of a NSOM, in
free space or coupled to transparent and plasmonic media. A single
holographic image recorded in one shot in the far field contains information
on both the amplitude and the phase of the scattered light. This is
sufficient to reverse numerically the propagation of the electromagnetic
field all the way to the aperture tip. Finite Difference Time Domain
(FDTD) simulations are performed to compare the experimental results
with a superposition of magnetic and electric dipole radiation