3D Optics

Friday, November 11, 2005 - 10:30am - 11:30am
EE/CS 3-180
George Barbastathis (Massachusetts Institute of Technology)
3D optical elements modulate light through interaction with an entire
volume of variable refractive index (as opposed to a sequence of surfaces
used in traditional optics.) One commonly used form of 3D optics is
gradient-index (GRIN) where the modulation is base-band. Instead, we have
emphasized use of modulations on a spatial carrier (grating.) We have
demonstrated that the resulting controllable shift variance and dispersion
can be used for optical slicing, real-time optical tomography, and
hyper-spectral imaging in three spatial dimensions. The extended degrees of
freedom available in defining the optical response of 3D optics with a
carrier makes this kind of optical elements suitable for computational
imaging. We will discuss examples where over-constrained least-squares
(pseudo-inverse) and maximum likelihood (Viterbi) algorithms were used to
maximize the image information extracted from the raw images.