Near-Infrared Optical Aborption Loss characteristics of Nonlinear Optical Polymers for Electro- ...


Announcing the Golden Gate Polymer Forum April Dinner Lecture

As always, be sure to page down for upcoming GGPF events & other local events of possible interest to the GGPF audience.

Wednesday, April 27 - GGPF Monthly Dinner Lecture

"Near-Infrared Optical Aborption Loss Characteristics of Nonlinear Optical Polymers for Electro-Optic Waveguide Applications"

Richard Barto
Lockheed Martin Advanced Technology Center, Palo Alto


Photonics technology has enabled enormous growth in the rate and efficiency of data transfer over long distances, and is continually advancing to keep pace with data traffic for land, airborne, and space-based communication networks. Active waveguide technologies for broadband applications related to fiber network, airborne, and space-based communications developed around nonlinear optical (NLO) dye/polymer-based electro-optic devices have distinct advantages over existing coax-based RF communications in terms of cost, weight, size, bandwidth, and immunity to electromagnetic interference. Great progress has been recently reported by Larry Dalton and Alex Jen in synthesizing organic NLO dyes of the merocyanine class with tricyano acceptors, demonstrating electro-optic coefficients greater than 100 pm/V at wavelengths of 1300 nm in thin films of polycarbonate, compared to a maximum reported value of 35 pm/V for lithium niobate. However, a lack of understanding of the underlying mechanisms of near-IR optical loss has inhibited demonstration of polymer-based optical devices possessing the requisite combination of high nonlinear activity, high thermal-temporal stability, and low propagation loss needed for wide implementation. The effects of the main dye electronic absorption peak and dye concentration on fundamental near-IR optical absorption has received little attention to this point. In this talk, the optical absorption behavior of organic nonlinear optical dyes combined with polymers for potential electro-optic waveguide applications is discussed in terms of structure-property relationships between absorption spectral features and polymer and dye molecular structure. An esoteric measurement technique, called photothermal deflection spectroscopy, in conjunction with conventional UV-Vis transmission spectroscopy, was built at Lockheed Martin and used for spectral characterization. Of central interest are the roles of polymer and dye structure and dielectric properties in the shape of the absorption spectrum in the near infrared region, at optical frequencies important to telecommunication applications (1.06, 1.3, and 1.55 microns). A highly active thiophene-bridged dye synthesized at Lockheed Martin, LMCO-46M, closely related to the well characterized dye FTC-2 from Larry Dalton and coworkers, was investigated as a homologous series of di-alkyl side-chain spacer group lengths as a guest-host system with polycarbonate, as well as a single di-alkyl spacer group length in a series of polycarbonates. The roles of spacer groups and polymer structure on dye-dye and dye-polymer interactions, and associated effects on inhomogeneous broadening and solvatochromism of the electronic absorption peak, are discussed for these materials. In contrast with the widely held view that near-IR loss in these materials is controlled by overtones of fundamental C-H stretches and bends, strong relationships between the features of the dye main electronic absorption peak and near-IR loss have been established. Predictive models of near-IR absorption loss based on dye geometry and dipole properties and polymer dielectric properties will be shown. The structure-property relationships have been used to aid in the design of organic nonlinear optical materials with minimized optical loss. In these studies, photothermal deflection spectroscopy has been demonstrated as an extraordinary technique for sensitively resolving the material structure-dependent near-IR spectra in NLO dye polymer systems.

Speaker Background

Dr. Richard Barto is a Materials Engineering Senior Staff member in the Materials and Structures group at Lockheed Martin Advanced Technology Center in Palo Alto, working as a principal investigator for R&D involving tailored functional materials for space applications. He and his colleagues have been developing materials and fabrication processes for electro-optic waveguide devices for advanced communications for the past nine years. He completed his Ph.D. in Materials Science and Engineering at Stanford University in September 2004, and performed his research on near infrared optical absorption behavior of nonlinear optical polymers at Lockheed Martin in as part of the electro-optic waveguide device R&D program. Here he developed a highly sensitive and fully automated photothermal deflection spectrometer (PDS) for Vis-NIR absorption measurements, combining instrument designs and expertise from previous systems developed at IBM Almaden, Sandia National Labs, Max Planck Institute for Polymer Research, and UC Davis. He has been at Lockheed Martin Space Systems Company since 1987, and has worked in a wide range of capacities with emphases on materials engineering, including structural composite materials and processes engineering; program technical liaison in the central material and process laboratories supporting failure analyses, manufacturing, and operations; Mission Success Organization responsible for flight readiness reviews; contamination control engineering with emphases on spacecraft plume effects of Hall Current Thrusters; and his present position in materials R&D. He began his career as a polymer research engineer at the Corporate Research Division of Allied Signal (now Honeywell) developing interpenetrating polymer networks and fluoropolymer blends. His present research interests involve the application of inorganic nanoscale structures to electroactive polymers for tailored multifunctional coatings



Date: Wednesday, April 27.

Location: Michael's at Shoreline
(see directions below)

Timing: 6 PM social hour
7 PM dinner
8 PM lecture

Cost: $30 with advance registration
Half price for students, retired, unemployed
Free for just the lecture at 8PM
(but please let us know for headcount)
$35 after registration deadline

PLEASE NOTE: we accept cash or checks, but are unable to
accept payment by credit card at this time.

Deadline for registration: 5 PM Monday, April 25.

Please register on the web site

Or, contact:
Bruce Prime

You should receive confirmation of your registration; if not,
please contact us again.


Dinner Choices (pick one when registering):
Broiled Salmon
Chicken Florentine
Grilled Vegetable Brochette with Wild Rice

Note that we must request that you be liable for your
registration fee if you register and do not attend;
cancellation is allowed up to the registration deadline.


Restaurant's web page directions

From 101 in Mountain View, take the Shoreline Boulevard
Exit, turning toward the bay. Drive past the Shoreline
Amphitheater on the left hand side and go straight ahead,
entering into Shoreline Park. After a mile or so inside
the park, a sign for Michael's will direct you to turn left
into the parking lot for Michael's Restaurant.
Address: 2960 N Shoreline Blvd.
Restaurant phone: 650-962-1014
(do not call restaurant for reservations)


Upcoming GGPF Dinner Lectures & Other Events:

Wed. May 18, Mountain View
Joint dinner meeting with the Society for Applied Spectrosocopy
"Chemical Imaging by Raman and Luminescence Spectroscopies for the Characterization of Polymer and Polymer Blend Structure"
David Tuschel, ChemImage Corp.

Sat. June 11, San Jose State University campus
A special one-day seminar on commercial modeling software and its
application to polymer materials science; jointly sponsored by GGPF and Accelrys, with two Accelrys speakers, two speakers who are industrial users of their software, and the opportunity for hands-on demos after the presentations Lunch and reception provided, very low cost to encourage maximum attendance.

Preliminary Agenda:

David Rigby - Fellow, Accelrys
"Computational Modeling of Polymer-Containing Systems: Past,
Present and Future"

Bharat Patel - Senior Scientist, Owens Corning
Title to be announced

Michael Makowski - Group Leader, Applied Scientific Computing, PPG
Industries R&D
"Recent Advances in Mesoscale Modeling Methods and their Successful
Application to Coatings and Colloid Related Problems"

Nick Reynolds - Director, Materials Science Applications, Accelrys
"Applications of Modeling in Solving Research Problems in the
Polymer Industry"

Materials Studio Software Demonstration

Following the presentations, and simultaneous with the wine and cheese reception, Accelrys will demonstrate the latest version (3.2) of their Materials Studio modeling software.

Further details and registration information will be provided in future announcements.


OTHER EVENTS of possible interest to the
GGPF audience:

APRIL 2005

April 12, Berkeley
NorCal AIChE Annual one-day Symposium
"Manufacturing 2010: Process Trends and Tools"

April 12, Palo Alto
Café Scientifique free seminar at the Roche campus
"Prions: Invaders from Inner Space", Prof. Stephen J. DeArmond, UCSF

April 12-14, Santa Clara
IEEE-sponsored NanoWorld conference

April 13, Santa Clara
Afternoon IEEE/CPMT seminar
"Packaging Technology for RF and RFID"

April 13, Mountain View
evening dinner lecture
joint meeting of Norcal SAMPE and ASMI Santa Clara
"Flat Panel Display Technology" by David E. Mentley, Editor of Display Technology Investor

April 21, Sunnyvale
Silicon Valley ESD Society's annual ESDiscovery event
(classes, tutorials, etc.)

April 21, Santa Clara
ACS dinner lecture
"An Overview of OLED Technology", by Homer Antoniadis, OSRAM Opto Semiconductors

April 22, San Jose
SPE Golden Gate Section 25th Annual Tech Fair

MAY 2005

May 9-10, Stanford
TA Instruments training courses on thermal analysis & rheology
May 9 - thermal analysis
May 10 - rheology
or contact
Michael Golinar,

May 11, Davis
ASM dinner lecture
"Carbon Nanotechnology Towards Applications Development for Space Exploration",
Alan M. Cassell, NASA Ames, speaking

May 12, South San Francisco
One-day free seminar on "Computational Solutions for Discovery Phase Research"
a Life Sciences computational event, sponsored by Accelyris
(registration required; see web page)

May 16-18, Santa Clara
three-day short course
"Advanced Silicon Processing 2005 - The Transition from Microelectronics to Nanotechnology"

May 18, Santa Clara
MicroElectronics Packaging & Test Engineering Council (MEPTEC)
3rd annual MEMS packaging sypmposium:
"Wafer-Level Packaging Enabling High-Volume Applications"

May 20, Foster City
lunchean speaker sponsored by Bay Area Analytical Chemists Network
"Drug Eluting Stents and Stent Analysis", Ed Berger, Guidant

May 23, Santa Clara
short course, "MEMS Design and Fabrication"

May 17, location tbd
local ACS/AIChE joint meeting
details not yet listed, check back

May 18, Santa Clara
IEEE one-day nanotech conference & job fair


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