Directional Second Harmonic Generation Controlled by
Sub-wavelength Facets of an Organic Mesowire
Posted on 2018-07-10 - 14:27
Directional harmonic generation is an important property characterizing the ability of nonlinear optical
antennas to diffuse the signal in 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 subwavelength facets. We observed that
the radial angles of the SHG emission can be tuned over a range of 130 degrees. 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.
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Sharma, Deepak; Chaubey, Shailendra; Vasista, Adarsh; Karumancheril, Jesil; Tripathi, Ravi; Bouhelier, Alexandre; et al. (2018). Directional Second Harmonic Generation Controlled by
Sub-wavelength Facets of an Organic Mesowire. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.4083047.v1
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AUTHORS (7)
DS
Deepak Sharma
SC
Shailendra Chaubey
AV
Adarsh Vasista
JK
Jesil Karumancheril
RT
Ravi Tripathi
AB
Alexandre Bouhelier
GK
G.V. Pavan Kumar