Res. Chem. Intermed.
, Vol. 34, No. 2–3, pp. 181–190 (2008)
Koninklijke Brill NV, Leiden, 2008.
Also available online - www.brill.nl/rci
Organic crystals for second harmonic generation switching
based on anil photochromes
, ARNAUD SPANGENBERG
, RÉMI MÉTIVIER
, KEITARO NAKATANI
and PEI YU
Ecole Normale Supérieure de Cachan, Laboratoire de Photophysique et de Photochimie
Supramoléculaires et Macromoléculaires (PPSM, CNRS UMR8531), Institut d’Alembert,
61 avenue du Président Wilson, 94235 Cachan Cedex, France
Université Paris-Sud, Laboratoire de Chimie Inorganique, Institut de Chimie Moléculaire et des
Matériaux d’Orsay (CNRS UMR8182), 91405 Orsay Cedex, France
Received 10 November 2006; accepted 20 January 2007
Abstract—In photochromic materials, we demonstrated that non-linear optical (NLO) properties
such as second harmonic generation (SHG) can be switched reversibly by alternate UV and visible
irradiations. We report here on the design of materials fulﬁlling the prerequisites for SHG activity
(push–pull and acentric space group) and photochromic properties. Photochromic and NLO properties
of a series of anils are presented, along with the ability of some of them to switch SHG.
Keywords: Non-linear optics; second harmonic generation; photochromism; switch.
Storing and transferring data are essential actions in information technology.
Nowadays, high storage capacity and high-speed transfer are required, and research
on new materials, which may be useful in this context, is performed in many
research groups throughout the world. Among them, materials in which optical
properties can be switched by means of light are of special interest, since “all
optical switching” devices can arise from them [1–3]. For optically inducing the
property changes, one can take advantage from photochromism, which is based on
a reversible photochemical reaction [4, 5]. Among properties that can be switched
by photochromism, we focused on second-order non-linear optical (NLO) organic
crystalline materials. Phenomena such as second harmonic generation (SHG) or
Present address: LASIR, USTL, 59655 Villeneuve d’Ascq Cedex, France.
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