






PDF Version of the program
Foundations of Nonlinear Optics
August
45, 2015, Room 91, Rauch Business Center
Lehigh
University, Bethlehem, PA
Day 1
8:00am

Coffee&Tea + breakfast snacks  in room 91

8:30am

Welcome: Ivan Biaggio, Lehigh University


Tutorial:  Scaling in Nonlinear Optics 
 Mark G. Kuzyk, Washington State University 

9:30am

Session I:  Quantum Optimization 
 Chair: Mark G. Kuzyk, Washington State University 
 Optimization of
Optical Nonlinearities Using Quantum Graph Models
Rick Lytel, First Degree
Innovation & Washington
State University
 Searching for
potentials which optimize the second hyperpolarizability with multiple
noninteracting electrons
Chris Burke, Tufts University
 Quantum Bounds on
Hyperpolarizability for Multiple Electrons and Constraints on FerroElectricity
Rolfe G. Petschek, Case Western
Reserve University
 Hyperpolarizabilities
of Exotic Potentials
Timothy J. Atherton, Tufts
University


Lunch Break – on site

1pm

Tutorial:  Application of Dalgarno Lewis Perturbation Theory to Nonlinear Optics 
 Sean
Mossman, Washington State University 

2pm

Session II:  Fundamental Limits and Scaling 
 Chair: Timothy Atherton, Tufts University 
 Molecular symmetry
as a constraint preventing the manystate catastrophe of fundamental limits
of the first hyperpolarizability
Sheng Ting Hung, University of Leuven
 Beyond simple
scaling: Finding the best molecular paradigms for nonlinear optics
Javier PerezMoreno, Skidmore College
 The Role of the
Continuum in Static Nonlinear Optics,
Sean Mossman, Washington State University

4:30pm

Tutorial:  Introduction to cavity polaritons 
 Kenneth D. Singer, Case Western Reserve University 


Discussion

6:30pm

Reception in Iacocca Hall

7:00pm

Dinner in Iacocca Hall

9:00pm

PostDinner Event at Molly's Pub
Sponsored by the local OSA student
chapter

Day 2
8:00am

Coffee&Tea + breakfast snacks  in room 91

8:30am

Tutorial:  The units and figure of merits of third order nonlinear optics:
Observations and open questions 
 Ivan Biaggio, Lehigh University 

9:15am

Session III:  Scaling in Device Geometries 
 Chair: Ivan Biaggio, Lehigh University 
 Processable organic materials with large figuresofmerit
for alloptical signal processing
Joseph Perry, Georgia Tech
 Nanophotonic scaling laws & lightmatter enhanced
optoelectronic devices
Volker Sorger, George Washington University
 Fundamental Limits of Device Figures of Merit,
Mark G. Kuzyk, Washington State University
 Cavity Effects in Organic Molecular Materials,
Kenneth D. Singer, Case Western Reserve University


Lunch Break – on site

1pm

Session IV:  Effects of Conjugation on the Nonlinear Response 
 Chair: Javier PerezMoreno, Skidmore College 
 Breaking Linear Conjugation in Second Order NLO
Chromophores Allowed or Disallowed?
Meghana Rawal, Nanoviricides, Inc.
 Classifying local piconjugation effects in organic
nonlinear optical materials
Jacquiline M. Cole, Cambridge
University
 Exceptional Nonlinear Optical Response in Twisted
Chromophores
Alexander Lou, Northwestern
University

2:30pm

Session V:  ThirdOrder Nonlinear Optics 
 Chair: Rick Lytel, First Degree Innovation & Washington State University 
 Nondegenerate Nonlinearities and 3level models
Eric Van Stryland, CREOL, The College of Optics and Photonics
 Spectroscopy of the ThirdOrder Polarizability via DFWM,
and the
Exceptional TwoPhoton Absorption of Some Small Molecules
Ivan Biaggio, Lehigh University


Discussion


Summary, conclusions, perspectives:
Tim Atherton, Ivan Biaggio, and Mark Kuzyk

6:00
9:00pm

PostFoNLO event at Illick's Mill Park
BBQ, drinks, etc ....
Organized by the OSA student chapters

Abstracts
 Timothy J. Atherton, Tufts University:
Hyperpolarizabilities of Exotic Potentials All known Hamiltonians appear to obey fundamental limits on the hyperpolarizabilities. Potentials that give a nonlinear response close to these limits have been found through numerical searches, and give some insight into molecular design. A long standing question is whether more exotic potentials can come closer, or even violate, these limits. This work considers nonHermitian but PTsymmetric potentials as candidates and examines their nonlinear response. While these Hamiltonians are pathological, they provide important insights into the nature of the limits.
 Ivan Biaggio, Lehigh University:
Spectroscopy of the ThirdOrder Polarizability via Degenerate FourWave Mixing, and the Exceptional TwoPhoton Absorption of Some Small Molecules
The first part of the talk presents a method for semiautomatic measurement of the complexvalued spectrum of the thirdorder polarizability using degenerate fourwave mixing. The second part of the talk discusses the nonlinear optical spectrum of some donoracceptor substituted small molecules and their large twophoton absorption to the lowest excited state when compared to the fundamental limit, the size of the molecules, and established twophoton absorbers like AF50.
 Chris Burke, Tufts University:
Searching for potentials which optimize the second hyperpolarizability with multiple noninteracting electrons
The existence of fundamental limits on the intrinsic molecular second hyperpolarizability has motivated a body of research studying the features of molecular potentials which are important for approaching this limit. In one previous study, a molecule was modeled using a onedimensional piecewiselinear potential, and the second hyperpolarizability was optimized with respect to the shape of the potential, revealing important features. Here I present an extension of this work to potentials containing multiple noninteracting elections.
 Jacquiline M. Cole, Cambridge University:
Classifying local piconjugation effects in organic nonlinear optical materials A new method is proposed by which local piconjugation effects can be indexed beyond immediate bond neighbors. Thus, the influence of intramolecular charge transfer is fully characterized, surpassing the pIcontribution confines of bond length alternation theory. Case studies of representative organic NLO materials will demonstrate the use of the methodology, and its ability to identify local hotspots of ICT structure. The talk concludes with prospecting the use of this classification toward high throughout materials discovery of new NLO chromophores.
 Sheng Ting Hung, University of Leuven:
Molecular symmetry as a constraint preventing the manystate catastrophe of fundamental limits of the first hyperpolarizability The calculation of the fundamental limits of hyperpolarizabilities posits that when a quantum system is at the fundamental limit, only three energy states contribute to hyperpolarizabilities. Allowing more states to contribute leads to divergence of the intrinsic hyperpolarizability at the limit of an infinite number of states. We discuss the effects of degeneracy and symmetry on the fundamental limits of the first hyperpolarizability.
 Mark G. Kuzyk, Washington State University:
Fundamental Limits of Device Figures of Merit An electrooptic modulator requires a large secondorder nonlinear susceptibility; but, large nonlinearity is often accompanied by larger optical loss, potentially rendering a material unsuitable. This work describes how device figuresofmerit, which account for this type of interdependence, can be optimized from first principles.
 Alexander Lou, Northwestern University:
Exceptional Nonlinear Optical Response in Twisted Chromophores Steric constraints in twisted intramolecular charge transfer (TICT) chromophores dictate a unique electronic structure, which gives rise to very large second order NLO response that approaches the fundamental limit. Both the synthesis and theoretical description of TICT chromophores has proven to be a challenging task. We have used experimental and computational results to describe the origin of large NLO response and to guide the design of several generations of TICT chromophores.
 Rick Lytel, Washington State University & First Degree Innovation:
Optimization of Optical Nonlinearities Using Quantum Graph Models Quantum graph models are applied to nonlinear optics to show how a single, short sidechain, placed judiciously on a linear structure, can generate a large phase disruption of critical eigenfunctions along the structure, producing large changes in the transition moments which leads to large intrinsic nonlinearities
 Sean Mossman, Washington State University:
The Role of the Continuum in Static Nonlinear Optics Nonlinear optical responses of molecules are typically done as a sum over a finite set of states. We show that the continuum plays a significant role in limiting the nonlinear response for singular potentials and discuss methods for including this effect.
 Javier PerezMoreno, Skidmore College:
Beyond simple scaling: Finding the best molecular paradigms for nonlinear optics Simple scaling must be taken into account in order to eliminate the size effects when we evaluate the efficiency of a molecule with nonlinear optical properties. This allows us to classify the performance of molecular classes in three categories: subscaling, nominal scaling, or superscaling; and to determine the best molecular paradigms that can be scaled up through the synthesis of larger homologues.
 Joseph Perry, Georgia Tech:
Processable organic materials with large figuresofmerit for alloptical signal processing Molecular design strategies to achieve nonlinear optical properties suitable for alloptical signal processing based on substitution of polymethines with rigid, bulky groups will be discussed. Polymethines exhibit a negative real part of the third order susceptibility that can be useful in the compensation of self phase modulation in optical fibers.
 Rolfe G. Petschek, Case Western Reserve University:
Quantum Bounds on Hyperpolarizability for Multiple Electrons and Constraints on FerroElectricity I will present two lines of research.Ê First, I will discuss numerical experiments to find upper limits on the second order hyperpolarizability of noninteracting electrons confined to move along a line.Ê Electrons with very strong attractive interactions can achieve a hyperpolarizability about 30% below the proven quantum limit.Ê Noninteracting electrons may provide more realistic limits on "real" electrons which repel each other.Ê Second, I will discuss how new ferromagnetic fluids with (only) orientational order suggest strong constraints the possibility of making fluids that have (only) orientational ferroelectric suggested order for practical nonlinear optical materials.
 Meghana Rawal, Nanoviricides, Inc.:
Breaking Linear Conjugation in Second Order NLO Chromophores, Allowed or Disallowed? Organic second order nonlinear optical chromophores typically consist of linearly conjugated donor/acceptor architecture. Theoretically, the donor and acceptor must be connected electronically to allow for large transition dipole moments and obtain molecules with large nonlinearities. This work discusses crossconjugated bridge structures that while breaking true conjugation, still allow for hyperpolarizabilities comparable to linearly conjugated systems.
 Kenneth D. Singer, Case Western Reserve University:
Cavity Effects in Organic Molecular Materials The coupling between cavity modes and excitons is an area of extensive research. Ultrastrong coupling has recently been observed in organic molecular materials with known large optical nonlinearities. We describe our recent results related to coupling between pairs coupled cavities in the ultrastrong limit, reflecting the breakdown of the rotating wave approximation. In addition, we show how strong materialcavity coupling can be applied to the design of efficient photovoltaic devices. Prospects for cavity QED in organic nonlinear optics will be described.
 Volker Sorger, George Washington University:
Nanophotonic scaling laws & lightmatter enhanced optoelectronic devices Over the last decade, onchip integrated optoelectronic circuits such as the silicon and IIIV platforms showed great potential for bigdata bandwidth applications. However, while the photonic device performance is steadily increasing, the inherently weak lightmatterinteractions sets fundamental limits to critical performance metrics such as footprint (i.e. integration density), speed (i.e. bandwidth), and drive power. The objective of this talk is to show ultimate device limitations while highlighting recent advances and solutions to overcome them for two key devices at the nanoscale; a case will be made on EO modulators.
 Eric Van Stryland, CREOL, The College of Optics and Photonics:
Nondegenerate Nonlinearities and 3level models Twophoton absorption, 2PA, in semiconductors is enhanced by orders of magnitude due to intermediatestate resonance enhancement, ISRE. Much smaller enhancement is seen in organic dyes, but quasi 3level models work well to describe the 2PA spectra and nonlinear refractive dispersion.



 