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Proceedings Paper

Optimization of the electronic third-order nonlinearity of cyanine-like molecules for all optical switching
Author(s): Honghua Hu; Trenton R. Ensley; Matthew Reichert; Manuel R. Ferdinandus; Davorin Peceli; Olga V. Przhonska; Seth R. Marder; Alex K.- Y. Jen; Joel M. Hales; Joseph W. Perry; David J. Hagan; Eric W. Van Stryland
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Paper Abstract

All optical switching (AOS) applications require materials with a large nonlinear refractive index (n2) but relatively small linear and nonlinear absorption loss. The figure-of-merit (FOM), defined as the ratio between the real and imaginary parts of the second hyperpolarizability (γ), is widely used to evaluate the operating efficiency of AOS materials. By using an essential-state model, we describe the general dispersion behavior of γ of symmetric organic molecules and predict that the optimized wavelength range for a large FOM is near its linear absorption edge for cyanine-like dyes. Experimental studies are normally performed on organic solutes in solution which becomes problematic when the solvent nonlinearity dominates the total signal. This has been overcome using a Dual-arm Z-scan methodology to measure the solution and solvent simultaneously on two identical Z-scan arms and discriminating their small nonlinear signal difference. This technique significantly reduces the measurement uncertainty by correlating the excitation noise in both arms, leading to nearly an order-of-magnitude increase in sensitivity. Here we investigate the n2 and two-photon absorption (2PA) spectra of several classes of cyanine-like organic molecules and find that the results for most molecules agree qualitatively and quantitatively with the essential-state model. Many cyanine-like molecules show a relatively small FOM due to the presence of large 2PA bands near the linear absorption edge; however, an exception is found for a thiopyrylium polymethine molecule of which the maximum FOM can be < 400, making it an excellent candidate for AOS.

Paper Details

Date Published: 7 March 2014
PDF: 6 pages
Proc. SPIE 8983, Organic Photonic Materials and Devices XVI, 898303 (7 March 2014); doi: 10.1117/12.2037003
Show Author Affiliations
Honghua Hu, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Trenton R. Ensley, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Matthew Reichert, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Manuel R. Ferdinandus, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Air Force Institute of Technology (United States)
Davorin Peceli, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Olga V. Przhonska, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
National Academy of Sciences (Ukraine)
Seth R. Marder, Georgia Institute of Technology (United States)
Alex K.- Y. Jen, Univ. of Washington (United States)
Joel M. Hales, Georgia Institute of Technology (United States)
Joseph W. Perry, Georgia Institute of Technology (United States)
David J. Hagan, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Univ. of Central Florida (United States)
Eric W. Van Stryland, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 8983:
Organic Photonic Materials and Devices XVI
Christopher E. Tabor; François Kajzar; Toshikuni Kaino; Yasuhiro Koike, Editor(s)

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