Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Directional second-harmonic generation controlled by sub-wavelength facets of an organic mesowire

Abstract

Directional harmonic generation is an important property characterizing the ability of nonlinear optical antennas to diffuse the signal in a well-defined region of space. Herein, we show how sub-wavelength facets of an organic molecular mesowire crystal can be utilized to systematically vary the directionality of second-harmonic generation (SHG) in the forward-scattering geometry. We demonstrate this capability on crystalline diamonoanthraquinone (DAAQ) mesowires with sub-wavelength facets. We observed that the radial angles of the SHG emission can be tuned over a range of 130 deg. This angular variation arises due to spatially distributed nonlinear dipoles in the focal volume of the excitation as well as the geometrical cross section and facet orientation of the mesowire. Numerical simulations of the near-field excitation profile corroborate the role of the mesowire geometry in localizing the electric field. In addition to directional SHG from the mesowire, we experimentally observe optical waveguiding of the nonlinear two-photon excited fluorescence (TPEF). Interestingly, we observed that for a given pump excitation, the TPEF signal is isotropic and delocalized, whereas the SHG emission is directional and localized at the location of excitation. All the observed effects have direct implications not only in active nonlinear optical antennas but also in nonlinear signal processing.

© 2018 Optical Society of America

Full Article  |  PDF Article
More Like This
Tuning the second-harmonic generation in AlGaAs nanodimers via non-radiative state optimization [Invited]

Davide Rocco, Valerio F. Gili, Lavinia Ghirardini, Luca Carletti, Ivan Favero, Andrea Locatelli, Giuseppe Marino, Dragomir N. Neshev, Michele Celebrano, Marco Finazzi, Giuseppe Leo, and Costantino De Angelis
Photon. Res. 6(5) B6-B12 (2018)

Membrane imaging by simultaneous second-harmonic generation and two-photon microscopy

L. Moreaux, O. Sandre, M. Blanchard-Desce, and J. Mertz
Opt. Lett. 25(5) 320-322 (2000)

Controllable color display induced by excitation-intensity-dependent competition between second and third harmonic generation in ZnO nanorods

Jun Dai, Mao-Hui Yuan, Jian-Hua Zeng, Qiao-Feng Dai, Sheng Lan, Chai Xiao, and Shao-Long Tie
Appl. Opt. 53(2) 189-194 (2014)

Supplementary Material (1)

NameDescription
Visualization 1       SHG signal from an organic meso wire under laser illumination showing the generation of SHG from different facets of the wire by moving the illumination spot transversly accross the mesowire axis.

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (7)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (3)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved