Unscrambling Structured Chirality with Structured
Light at the Nanoscale Using Photoinduced Force
Version 2 2018-10-19, 18:48
Version 1 2018-10-19, 16:49
Posted on 2018-10-19 - 18:48
We
show that the gradient force generated by the near field of
a chiral nanoparticle carries information about its chirality. On
the basis of this physical phenomenon we propose a new microscopy
technique that enables the prediction of spatial features of chirality
of nanoscale samples by exploiting the photoinduced optical force
exerted on an achiral tip in the vicinity of the test specimen. The
tip–sample interactive system is illuminated by structured
light to probe both the transverse and longitudinal (with respect
to the beam propagation direction) components of the sample’s
magnetoelectric polarizability as the manifestation of its sense of
handedness, i.e., chirality. We specifically prove that although circularly
polarized waves are adequate to detect the transverse polarizability
components of the sample, they are unable to probe the longitudinal
component. To overcome this inadequacy and probe the longitudinal
chirality, we propose a judiciously engineered combination of radially
and azimuthally polarized beams as optical vortices possessing pure
longitudinal electric and magnetic field components along their vortex
axis, respectively. The proposed technique may benefit branches of
science such as stereochemistry, biomedicine, physical and material
science, and pharmaceutics.
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Kamandi, Mohammad; Albooyeh, Mohammad; Veysi, Mehdi; Rajaei, Mohsen; Zeng, Jinwei; Wickramasinghe, H. Kumar; et al. (2018). Unscrambling Structured Chirality with Structured
Light at the Nanoscale Using Photoinduced Force. ACS Publications. Collection. https://doi.org/10.1021/acsphotonics.8b00765
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AUTHORS (7)
MK
Mohammad Kamandi
MA
Mohammad Albooyeh
MV
Mehdi Veysi
MR
Mohsen Rajaei
JZ
Jinwei Zeng
HW
H. Kumar Wickramasinghe
FC
Filippo Capolino