Developing Next Generation Multidimensional Optical Imaging Devices

Liang Gao

Liang Gao

(Rioch Innovations)

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Date: September 30, 2015


When performing optical measurement with a limited photon budget, it is important to assure that each detected photon is as rich in information as possible. Conventional optical imaging systems generally tag light with just two characteristics (x, y), measuring its intensity in a 2D (x, y) lattice.  However, this throws away much of the information content actually carried by a photon. This  information can be written as (x, y, z, θ, φ, λ, t, ψ, χ): the spatial coordinates (x, y, z) are in 3D, the propagation polar angles (θ, φ) are in 2D, and the wavelength (λ), emission time (t), and polarization orientation and ellipticity angles (ψ, χ) are in 2D.  Neglecting coherence effects, a photon thus carries with it nine tags. In order to explore this wealth of information, an imaging system should be able to characterize measured photons in 9D, rather than in 2D.

This presentation will provide an overview of the next generation of multidimensional optical imaging devices which leverage advances in computational optics, micro-fabrication, and detector technology.  The resultant systems can simultaneously capture multiple photon tags in parallel, thereby maximizing the information content we can acquire from a single camera exposure.  In particular, I will discuss our recent development of two game-changing technologies—a snapshot hyperspectral imager, image mapping spectrometer (IMS), and an ultrafast imager, compressed ultrafast photography (CUP)—and how these techniques can potentially revolutionize our sensation of surrounding world.

Further Information:

Dr. Liang Gao is currently an advisory research scientist in computational optical imaging group at Ricoh Innovations. His primary research interests are microscopy, including super-resolution microscopy and photoacoustic microscopy, cost-effective high-performance optics for diagnostics, computational optical imaging, ultrafast imaging, and multidimensional optical imaging. Dr. Liang Gao is the author of more than 30 peer-reviewed publications in top-tier journals, such as Nature, Physics Report, and Annual Review of Biomedical Engineering. He received his BS degree in Physics from Tsinghua University in 2005 and PhD degree in Applied Physics and Bioengineering from Rice University in 2011.

Created: Wednesday, September 30th, 2015