Events

ELSC Seminar: Dr. Ori Katz Thu. 10/11 at 17:00

November 10, 2016

ELSC cordially invites you to the lecture given by:

Dr. Ori Katz

Department of Applied Physics, The Selim and Rachel Benin School of Computer Science & Engineering
The Hebrew University of Jerusalem, 9190401 Jerusalem, ISRAEL
Author e-mail address: orik@mail.huji.ac.il

On the topic of:

Imaging with Scattered Light: looking through the 'fog'

The lecture will be held on Thursday, November 10th, at 17:00 at ELSC: Silberman Bldg., 3rd Wing, 6th Floor, Edmond J. Safra Campus

Light refreshments at 16:45

 

Abstract:

Scattering of light in complex samples such as biological tissue renders most samples opaque to conventional optical imaging techniques, limiting the penetration depth of even the state of the art microscopy techniques to a fraction of a millimeter in tissue. However, although random, scattering is a deterministic process, and it can be undone, controlled, and even exploited by carefully shaping the input wavefront, forming the basis for the emerging field of optical wavefront-shaping [1,2], and opening the path to imaging through visually opaque samples [3] and to the control of scattered ultrashort pulses [4]. Unfortunately, many of these pioneering demonstrations [1-4] required an invasive implantation of an optical probe at the target for determining the wavefront distortions.

I will present some of our recent efforts in addressing this challenge [5-10]. These include the use of the photoacoustic effect to focus and control light non-invasively inside a scattering medium [5,6], and the use of optical nonlinearities to focus light noninvasively through scattering samples [7]. I will also show how one can surprisingly image through opaque samples and ‘around corners’ using nothing but a smartphone camera [8], by exploiting the inherent correlations of scattered light, challenging the common view on diffuse scattered light as an information-less halo. If time permits I will present our efforts in exploiting these principles for novel endoscopic techniques [9-11].

 

References

[1]   Z. Merali, “Optics: Super vision”, Nature 518, 158 (2015).

[2]   A.P. Mosk et al., "Controlling waves in space and time for imaging and focusing in complex media", Nature Photonics 6, 283 (2012).

[3]   O. Katz et al., "Looking around corners and through thin turbid layers in real time with scattered incoherent light", Nature Photonics 6, 549 (2012).

[4]   O. Katz et al., "Focusing and compression of ultrashort pulses through scattering media", Nature Photonics 5, 372 (2011).

[5]   T. Chaigne et al. "Controlling light in scattering media noninvasively using the photo-acoustic transmission-matrix.", Nature Photonics 8, 58 (2014).

[6]  T.Chaigne et al. "Super-resolution photoacoustic fluctuation imaging with multiple speckle illumination", OpticaVol. 3, 1, 54-57 (2016)

[6]   O.Katz et al., "Noninvasive nonlinear focusing and imaging through strongly scattering turbid layers", Optica, 1, 3, 170-174 (2014).

[7]   O. Katz et al., "Non-invasive single-shot imaging through scattering layers and around corners via speckle correlations", Nature Photonics, 8,

784–790 (2014)

[8]   M. Kolenderska et al., "Scanning-free imaging through a single fiber by random spatio-spectral encoding", Optics Letters, 40, 4, 534-537 (2015)

[9]   A.Porat et al., "Widefield lensless imaging through a fiber bundle via speckle-correlations",  Optics Express (2016) 

[10] S.Rosen et al., "Focusing and Scannign through Flexible Multimode Fibers without Access to the Distal End”, arXiv : 1506.08586 (2015)