Aligned and polarized | Nature Physics
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_Nature Nanotech._ http://doi.org/z89 (2015) Many organic dipolar molecules display nonlinear optical behaviour: the square of an applied electric field — associated with light, for example
— contributes to the magnitude of the molecule's induced polarization. Second-order nonlinear response has many applications, including laser frequency doubling. In three or two
dimensions, however, a set of identical dipoles will arrange in a pairwise manner, with neighbouring dipole moments being antiparallel to each other. As a result, any nonlinear optical
response of the whole array cancels out. In contrast, the one-dimensional equilibrium arrangement has dipoles lined up head-to-tail, leading to an enhanced nonlinear optical response. But
how do you coax the molecules onto a line? Sofie Cambré and colleagues have found the trick: carbon nanotubes can provide just the right confinement. The authors were able to encapsulate
certain asymmetric dye molecules in nanotubes, and observed a nonlinear optical response enhancement of a factor of more than fifty. Tube diameter and synthesis temperature act as
experimental knobs for adjusting the degree of alignment. The filled nanotubes are chemically inert, making them ideal building blocks for novel nonlinear optical materials. Authors * Bart
Verberck View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Verberck,
B. Aligned and polarized. _Nature Phys_ 11, 210 (2015). https://doi.org/10.1038/nphys3283 Download citation * Published: 03 March 2015 * Issue Date: March 2015 * DOI:
https://doi.org/10.1038/nphys3283 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content: Get shareable link Sorry, a shareable link is not currently
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