Asymmetric Optical Second-Harmonic Generation from ChiralG-Shaped Gold Nanostructures

Abstract

We present a new electromagnetic phenomenon-the asymmetric second-harmonic generation from planar chiral structures. The effect consists in distinguishing the handedness of a chiral material by rotating the sample in an experiment involving solely linearly polarized light. This phenomenon originates in the surface plasmon resonance of chiral gold nanostructures, where homodyne interference of anisotropic and chiral electric and/or magnetic multipoles appears to play an important role.

Communication: SHG-detected circular dichroism imaging using orthogonal phase-locked laser pulses

“…Ultraviolet CD reports on relative amounts of protein secondary structure; 1 vibrational CD is used to determine molecular structure; 2 nonlinear CD has played a pivotal role in the recent emergence of chiro-optical photonic nanomaterials. [3][4][5][6][7][8][9][10] The NLO responses of these materials depend critically upon the precise arrangement of nanoparticles within a network, 3 requiring single-nanostructure measurements. Therefore, CD imaging with high spatial resolution has the much-needed capacity to fill a void in nanophotonics research.…”

Linear and nonlinear Fano resonance on two-dimensional magnetic metamaterials

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] By using enhanced optical nonlinearity in metallic nanostructures, plasmonic/metamaterial devices have been used for ultrafast optical switching applications. [17][18][19] In the field of nonlinear optics, while second-order processes have been extensively studied on various plasmonic/metamaterial nanostructures, [2][3][4][5][6][7][8][9][10] third-order nonlinear optical phenomena on metallic nanostructures are attracting more attention.…”

“…[17][18][19] In the field of nonlinear optics, while second-order processes have been extensively studied on various plasmonic/metamaterial nanostructures, [2][3][4][5][6][7][8][9][10] third-order nonlinear optical phenomena on metallic nanostructures are attracting more attention. For example, surface enhanced four-wave mixing on gold plasmonic nanostructures 11,12,14 and a plasmon-enhanced third harmonic generation 15,16 were demonstrated by virtue of a light confinement effect of plasmonic excitations. Although the strong field localization discussed usually refers to the electric field, the magnetic field also significantly contributes to the enhancement of the electric field under resonant conditions.…”

Controlling third harmonic generation with gammadion-shaped chiral metamaterials

“…15 Recently, there is also a growing interest in nonlinear optical signals generated from chiral plasmonic nanostructures, which provide a promising platform to study chiral-selective nonlinear optical interactions. [16][17][18][19][20][21][22] For example, asymmetric SHG from chiral G-shaped gold nanostructures upon a reverse of the handedness of the structures was presented. 16 The interplay of nonlinearity and circular dichroism (CD) was highlighted from the observation of strong cross-phase modulation and four-wave mixing in a type of varactor-loaded nonlinear chiral metamaterial.…”

“…[16][17][18][19][20][21][22] For example, asymmetric SHG from chiral G-shaped gold nanostructures upon a reverse of the handedness of the structures was presented. 16 The interplay of nonlinearity and circular dichroism (CD) was highlighted from the observation of strong cross-phase modulation and four-wave mixing in a type of varactor-loaded nonlinear chiral metamaterial. 17 Chirality signatures of individual twisted-cross gold nanodimers via SHG microscopy, 18 nonlinear imaging and spectroscopy of artificial enantiomers of a twisted-arc metamaterial, 19 and harmonic generation of optical activity 22 Furthermore, we also demonstrate that rotating the gammadion around its rotational axis can continuously control the phase of the THG, and thus can be utilized in the FZP design to rotate the polarization of the output THG signals.…”