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Unveiling the propagation dynamics of self-accelerating vector beams

View Article: PubMed Central - PubMed

ABSTRACT

We study theoretically and experimentally the varying polarization states and intensity patterns of self-accelerating vector beams. It is shown that as these beams propagate, the main intensity lobe and the polarization singularity gradually drift apart. Furthermore, the propagation dynamics can be manipulated by controlling the beams’ acceleration coefficients. We also demonstrate the self-healing dynamics of these accelerating vector beams for which sections of the vector beam are being blocked by an opaque or polarizing obstacle. Our results indicate that the self-healing process is almost insensitive for the obstacles’ polarization direction. Moreover, the spatial polarization structure also shows self- healing properties, and it is reconstructed as the beam propagates further beyond the perturbation plane. These results open various possibilities for generating, shaping and manipulating the intensity patterns and space variant polarization states of accelerating vector beams.

No MeSH data available.


(Top row) Stokes parameters of radially polarized light.The distinct polarization structure is manifested by the four-lobe form of parameters S1 and S2. S3 which should be zero is indeed noticeably weaker yet it is not identically zero due to inaccuracies in polarizers and QWPs used. (Middle row) CCD image and S1 and S2 parameters for RAVB’s at the focal plane. Note the clear sign of radial polarization. (Bottom row) S0–S2 parameters for the RAVB after propagating 10 cm beyond the focal plane. As can be observed, the radial polarization singularity is drifted towards the beam’s tail.
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f2: (Top row) Stokes parameters of radially polarized light.The distinct polarization structure is manifested by the four-lobe form of parameters S1 and S2. S3 which should be zero is indeed noticeably weaker yet it is not identically zero due to inaccuracies in polarizers and QWPs used. (Middle row) CCD image and S1 and S2 parameters for RAVB’s at the focal plane. Note the clear sign of radial polarization. (Bottom row) S0–S2 parameters for the RAVB after propagating 10 cm beyond the focal plane. As can be observed, the radial polarization singularity is drifted towards the beam’s tail.

Mentions: Where J1(x) is the first order radial Bessel function, r and are the radial coordinate and the radial unit vector respectively, and k is the propagation wavenumber in the propagation (z) direction. The radially polarized beam has a distinct signature in its Stokes parameters, namely the four-lobed structure of S1 and S2 parameters as depicted in Fig. 2 (top row). This unique signature will be used further in this report to establish the polarization properties of radially polarized Airy beams.


Unveiling the propagation dynamics of self-accelerating vector beams
(Top row) Stokes parameters of radially polarized light.The distinct polarization structure is manifested by the four-lobe form of parameters S1 and S2. S3 which should be zero is indeed noticeably weaker yet it is not identically zero due to inaccuracies in polarizers and QWPs used. (Middle row) CCD image and S1 and S2 parameters for RAVB’s at the focal plane. Note the clear sign of radial polarization. (Bottom row) S0–S2 parameters for the RAVB after propagating 10 cm beyond the focal plane. As can be observed, the radial polarization singularity is drifted towards the beam’s tail.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5037461&req=5

f2: (Top row) Stokes parameters of radially polarized light.The distinct polarization structure is manifested by the four-lobe form of parameters S1 and S2. S3 which should be zero is indeed noticeably weaker yet it is not identically zero due to inaccuracies in polarizers and QWPs used. (Middle row) CCD image and S1 and S2 parameters for RAVB’s at the focal plane. Note the clear sign of radial polarization. (Bottom row) S0–S2 parameters for the RAVB after propagating 10 cm beyond the focal plane. As can be observed, the radial polarization singularity is drifted towards the beam’s tail.
Mentions: Where J1(x) is the first order radial Bessel function, r and are the radial coordinate and the radial unit vector respectively, and k is the propagation wavenumber in the propagation (z) direction. The radially polarized beam has a distinct signature in its Stokes parameters, namely the four-lobed structure of S1 and S2 parameters as depicted in Fig. 2 (top row). This unique signature will be used further in this report to establish the polarization properties of radially polarized Airy beams.

View Article: PubMed Central - PubMed

ABSTRACT

We study theoretically and experimentally the varying polarization states and intensity patterns of self-accelerating vector beams. It is shown that as these beams propagate, the main intensity lobe and the polarization singularity gradually drift apart. Furthermore, the propagation dynamics can be manipulated by controlling the beams’ acceleration coefficients. We also demonstrate the self-healing dynamics of these accelerating vector beams for which sections of the vector beam are being blocked by an opaque or polarizing obstacle. Our results indicate that the self-healing process is almost insensitive for the obstacles’ polarization direction. Moreover, the spatial polarization structure also shows self- healing properties, and it is reconstructed as the beam propagates further beyond the perturbation plane. These results open various possibilities for generating, shaping and manipulating the intensity patterns and space variant polarization states of accelerating vector beams.

No MeSH data available.