22 research outputs found
Inline holographic coherent anti-Stokes Raman microscopy
We demonstrate a simple approach for inline holographic coherent anti-Stokes Raman scattering (CARS) microscopy, in which a layer of uniform nonlinear medium is placed in front of a specimen to be imaged. The reference wave created by four-wave mixing in the nonlinear medium can interfere with the CARS signal generated in the specimen to result in an inline hologram. We experimentally and theoretically investigate the inline CARS holography and show that it has chemical selectivity and can allow for three-dimensional imaging. © 2010 Optical Society of America
Roadmap on digital holography [Invited]
This Roadmap article on digital holography provides an overview of a vast array of research activities in the field of digital holography. The paper consists of a series of 25 sections from the prominent experts in digital holography presenting various aspects of the field on sensing, 3D imaging and displays, virtual and augmented reality, microscopy, cell identification, tomography, label-free live cell imaging, and other applications. Each section represents the vision of its author to describe the significant progress, potential impact, important developments, and challenging issues in the field of digital holography
Scattering invariant modes of light in complex media
Random scattering of light in disordered media is an intriguing phenomenon of
fundamental relevance to various applications. While techniques such as
wavefront shaping and transmission matrix measurements have enabled remarkable
progress for advanced imaging concepts, the most successful strategy to obtain
clear images through a disordered medium remains the filtering of ballistic
light. Ballistic photons with a scattering-free propagation are, however,
exponentially rare and no method so far can increase their proportion. To
address these limitations, we introduce and experimentally implement here a new
set of optical states that we term Scattering Invariant Modes (SIMs), whose
transmitted field pattern is the same, irrespective of whether they scatter
through a disordered sample or propagate ballistically through a homogeneous
medium. We observe SIMs that are only weakly attenuated in dense scattering
media, and show in simulations that their correlations with the ballistic light
can be used to improve imaging inside scattering materials
Compressive holography.
Compressive sampling enables signal reconstruction using less than one measurement per reconstructed signal value. Compressive measurement is particularly useful in generating multidimensional images from lower dimensional data. We demonstrate single frame 3D tomography from 2D holographic data.Dissertatio