May 14, 2015 - George Barbastathis

Click to Signup Location: Rebecca's Cafe, 275 Grove St., Auburndale, MA 02466
Dinner Reservation Deadline: May 11, 2015 @ 6pm

Compressive phase retrieval

Compressive sensing is a class of image recovery techniques utilizing sparsity priors to recover undersampled signals with high fidelity. This talk is about compressive sensing for phase retrieval from coherent fields and correlation function retrieval from partially coherent fields. For coherent fields, I will discuss in particular the use of intensity priors in the “transport of intensity equation” method, where the phase is obtained by analogy to a lateral pressure potential in a compressible flow. Transport of intensity is especially interesting in the x-ray regime, where standard interferometry is difficult because common sources are spatially partially coherent and beam splitters-combiners are not available; as a convincing example, I will show how the sparsity prior of quasi-constant object density allows successful x-ray phase recovery despite the low coherence. For partially coherent fields, I will describe how by using phase-space (Wigner space) methods and sparsity priors on the number of coherent modes it is possible to retrieve the correlation function, which can still lead to complete characterization of physical objects. 


George Barbastathis, MIT

George Barbastathis received the Diploma in Electrical and Computer Engineering in 1993 from the National Technical University of Athens (Πολυτεχνείο) and the MSc and PhD degrees in Electrical Engineering in 1994 and 1997, respectively, from the California Institute of Technology (Caltech.) After post-doctoral work at the University of Illinois at Urbana-Champaign, he joined the faculty at MIT in 1999, where he is now Professor of Mechanical Engineering. He has worked or held visiting appointments at Harvard University, the Singapore-MIT Alliance for Research and Technology (SMART) Centre, the National University of Singapore, and the University of Michigan – Shanghai Jiao Tong University Joint Institute (密西根交大学院) in Shanghai, People’s Republic of China.

His research interests are three-dimensional and spectral imaging; phase estimation; holography; and gradient index optics theory and implementation with subwavelength-patterned dielectrics. He is member of the Institute of Electrical and Electronics Engineering (IEEE), the American Society of Mechanical Engineers (ASME) and in 2010 he was elected Fellow of the Optical Society of America.


Dinner & Meeting reservations must be made by 6 PM, May 11, 2015.  We can no longer accept dinner reservations after this cutoff.
Meeting-Only registrations are appreciated by May 13, 2015.  Walk-ins are acceptable for the meeting-only.

Please make online reservations via the link above.

Reservations may also be left on the answering machine at (617) 584-0266. We no longer have an email address for reservations due to SPAM.

When making reservation requests, please provide the following information:

  • DINNER AND MEETING or meeting only
  • Name(s) and membership status
  • Daytime phone number where you can be reached (in case of change or cancellation)


Rebeccas Cafe (Located in back of the office complex)
275 Grove Street
Auburndale, MA 02466

(617) 969-3282

(Map to Rebecca's).

Networking—5:45 PM, Dinner—6:45, Meeting—7:30 PM.


Varies meeting-to-meeting.

Vegetarian option available on request

Dinner Prices*:

 NES/OSA Members and their guests   $25.00 each 
 Non-members   $30.00
 Students   $5.00 
 Post-Docs   $15.00 






* CYC Technology Group has graciously offered to sponsor the dinner cost for monthly meetings for students, post-docs, and the unemployed.  To take advantage of this generous offer, please register for the monthly meetings as you normally do, without paying, and send an email to This email address is being protected from spambots. You need JavaScript enabled to view it. letting us know of your intent.  Many thanks to CYC Technology Group!

General Information on NES/OSA Meetings

Cancellations and No-shows:

If the meeting must be canceled for any reason, we will try to call you at the phone number you leave with your reservation. Official notice of cancellation will be on our answering machine.

We have to pay for the dinners reserved as of the Tuesday before the meeting, so no-shows eat into our cash reserve. If you will not be able to attend, please let us know as early as possible. Otherwise, no-shows will be billed.

Membership Rates:

Regular members $15.00
Student members free




NOTE: The extra $5.00 of the non-member dinner fee can be used toward membership dues if the nonmember joins and pays dues for the current year at the meeting.