Microlens-aided focusing of linearly and azimuthally polarized laser light

S.S. Stafeev, A.G. Nalimov, M. V. Kotlyar, D. Gibson, S. Song, L. O'Faolain, V.V Kotlyar

Research output: Contribution to journalArticle

Abstract

We have investigated a four-sector transmission polarization converter (4-SPC) for a wavelength of 633 nm, that enables the conversion of a linearly polarized incident beam into a mixture of linearly and azimuthally polarized beams. It was numerically shown that by placing a Fresnel zone plate of focal length 532 nm immediately after the 4-SPC, the incident light can be focused into an oblong subwavelength focal spot whose size is smaller than the diffraction limit (with width and breadth, respectively, measuring FWHM $=$ 0.28x03BB; and FWHM $=$ 0.45x03BB;, where x03BB; is the incident wavelength and FWHM stands for full-width at half maximum of the intensity). After passing through the 4-SPC, light propagates in free space over a distance of 300 x03BC;m before being focused by a Fresnel zone plate (ZP), resulting in focal spot measuring 0.42x03BB; and 0.81x03BB;. The focal spot was measured by a near-field microscope SNOM, and the transverse E-field component of the focal spot was calculated to be 0.42x03BB; and 0.59x03BB;. This numerical result was verified experimentally, giving a focal spot of smaller and larger size, respectively, measuring 0.46x03BB; and 0.57x03BB;. To our knowledge, this is the first implementation of polarization conversion and subwavelength focusing of light using a pair of transmission micro-optic elements.
Original languageEnglish
Pages (from-to)29800-29813
Number of pages14
JournalOptics Express
Volume24
Issue number26
DOIs
Publication statusPublished - 15 Dec 2016

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lasers
polarization
wavelengths
converters
near fields
sectors
microscopes
optics
diffraction

Keywords

  • Binary optics
  • Microstructure fabrication
  • Polarization-selective devices
  • Polarization
  • Diffractive lenses
  • Near-field microscopy
  • Subwavelength structures

Cite this

Stafeev, S. S., Nalimov, A. G., Kotlyar, M. V., Gibson, D., Song, S., O'Faolain, L., & Kotlyar, V. V. (2016). Microlens-aided focusing of linearly and azimuthally polarized laser light. Optics Express, 24(26), 29800-29813. https://doi.org/10.1364/OE.24.029800
Stafeev, S.S. ; Nalimov, A.G. ; Kotlyar, M. V. ; Gibson, D. ; Song, S. ; O'Faolain, L. ; Kotlyar, V.V. / Microlens-aided focusing of linearly and azimuthally polarized laser light. In: Optics Express. 2016 ; Vol. 24, No. 26. pp. 29800-29813.
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abstract = "We have investigated a four-sector transmission polarization converter (4-SPC) for a wavelength of 633 nm, that enables the conversion of a linearly polarized incident beam into a mixture of linearly and azimuthally polarized beams. It was numerically shown that by placing a Fresnel zone plate of focal length 532 nm immediately after the 4-SPC, the incident light can be focused into an oblong subwavelength focal spot whose size is smaller than the diffraction limit (with width and breadth, respectively, measuring FWHM $=$ 0.28x03BB; and FWHM $=$ 0.45x03BB;, where x03BB; is the incident wavelength and FWHM stands for full-width at half maximum of the intensity). After passing through the 4-SPC, light propagates in free space over a distance of 300 x03BC;m before being focused by a Fresnel zone plate (ZP), resulting in focal spot measuring 0.42x03BB; and 0.81x03BB;. The focal spot was measured by a near-field microscope SNOM, and the transverse E-field component of the focal spot was calculated to be 0.42x03BB; and 0.59x03BB;. This numerical result was verified experimentally, giving a focal spot of smaller and larger size, respectively, measuring 0.46x03BB; and 0.57x03BB;. To our knowledge, this is the first implementation of polarization conversion and subwavelength focusing of light using a pair of transmission micro-optic elements.",
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Stafeev, SS, Nalimov, AG, Kotlyar, MV, Gibson, D, Song, S, O'Faolain, L & Kotlyar, VV 2016, 'Microlens-aided focusing of linearly and azimuthally polarized laser light', Optics Express, vol. 24, no. 26, pp. 29800-29813. https://doi.org/10.1364/OE.24.029800

Microlens-aided focusing of linearly and azimuthally polarized laser light. / Stafeev, S.S.; Nalimov, A.G.; Kotlyar, M. V.; Gibson, D.; Song, S.; O'Faolain, L.; Kotlyar, V.V.

In: Optics Express, Vol. 24, No. 26, 15.12.2016, p. 29800-29813.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Microlens-aided focusing of linearly and azimuthally polarized laser light

AU - Stafeev, S.S.

AU - Nalimov, A.G.

AU - Kotlyar, M. V.

AU - Gibson, D.

AU - Song, S.

AU - O'Faolain, L.

AU - Kotlyar, V.V

PY - 2016/12/15

Y1 - 2016/12/15

N2 - We have investigated a four-sector transmission polarization converter (4-SPC) for a wavelength of 633 nm, that enables the conversion of a linearly polarized incident beam into a mixture of linearly and azimuthally polarized beams. It was numerically shown that by placing a Fresnel zone plate of focal length 532 nm immediately after the 4-SPC, the incident light can be focused into an oblong subwavelength focal spot whose size is smaller than the diffraction limit (with width and breadth, respectively, measuring FWHM $=$ 0.28x03BB; and FWHM $=$ 0.45x03BB;, where x03BB; is the incident wavelength and FWHM stands for full-width at half maximum of the intensity). After passing through the 4-SPC, light propagates in free space over a distance of 300 x03BC;m before being focused by a Fresnel zone plate (ZP), resulting in focal spot measuring 0.42x03BB; and 0.81x03BB;. The focal spot was measured by a near-field microscope SNOM, and the transverse E-field component of the focal spot was calculated to be 0.42x03BB; and 0.59x03BB;. This numerical result was verified experimentally, giving a focal spot of smaller and larger size, respectively, measuring 0.46x03BB; and 0.57x03BB;. To our knowledge, this is the first implementation of polarization conversion and subwavelength focusing of light using a pair of transmission micro-optic elements.

AB - We have investigated a four-sector transmission polarization converter (4-SPC) for a wavelength of 633 nm, that enables the conversion of a linearly polarized incident beam into a mixture of linearly and azimuthally polarized beams. It was numerically shown that by placing a Fresnel zone plate of focal length 532 nm immediately after the 4-SPC, the incident light can be focused into an oblong subwavelength focal spot whose size is smaller than the diffraction limit (with width and breadth, respectively, measuring FWHM $=$ 0.28x03BB; and FWHM $=$ 0.45x03BB;, where x03BB; is the incident wavelength and FWHM stands for full-width at half maximum of the intensity). After passing through the 4-SPC, light propagates in free space over a distance of 300 x03BC;m before being focused by a Fresnel zone plate (ZP), resulting in focal spot measuring 0.42x03BB; and 0.81x03BB;. The focal spot was measured by a near-field microscope SNOM, and the transverse E-field component of the focal spot was calculated to be 0.42x03BB; and 0.59x03BB;. This numerical result was verified experimentally, giving a focal spot of smaller and larger size, respectively, measuring 0.46x03BB; and 0.57x03BB;. To our knowledge, this is the first implementation of polarization conversion and subwavelength focusing of light using a pair of transmission micro-optic elements.

KW - Binary optics

KW - Microstructure fabrication

KW - Polarization-selective devices

KW - Polarization

KW - Diffractive lenses

KW - Near-field microscopy

KW - Subwavelength structures

U2 - 10.1364/OE.24.029800

DO - 10.1364/OE.24.029800

M3 - Article

VL - 24

SP - 29800

EP - 29813

JO - Optics Express

JF - Optics Express

SN - 1094-4087

IS - 26

ER -