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July 22, 2009

Mtg: Sub-wavelength Dielectric Gratings: A New Handle On Light

by @ 6:18 pm. Filed under ALL, Communications, NanoEngineering, Optics/Displays

WEDNESDAY August 19, 2009
SCV Nanotechnology Chapter
Speaker: Dr. David Fattal, Staff Researcher, HP Labs
Time: Registration & light lunch 11:30 AM; Presentation at 12:00 Noon
Cost: IEEE Members and Students $5; Non-Members $10
Place: National Semiconductor Bldg E-1 CMA Room. 2900 Semiconductor Drive, Santa Clara
RSVP: via the website

Dielectric gratings exhibiting resonance phenomena have been studied since the early 90’s, offering a new paradigm for optical filtering and sensing.? More recently, they have been proposed as an interesting alternative to DBR stacks to realize high quality reflectors, for use e.g. in VCSELs.? Our team at HP Labs is pushing the resonance grating concept even further.? We discovered that a non-periodic resonance grating can offer an unprecedented level of control over an optical beam — acting like a high reflectivity mirror or a high transmission lens with the ability to alter the phase front of the beam in an arbitrary way.
In this talk, I will review the main physics behind sub-wavelength resonance gratings, and will explain this novel phase front control concept, illustrated by some recent experimental results of a “planar” cylindrical and spherical mirror.

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