Tight focusing of laser light using a chromium Fresnel zone plate

V. V. Kotlyar; S. S. Stafeev; A. G. Nalimov; M. V. Kotlyar; Liam O'Faolain; E. S. Kozlova

doi:10.1364/OE.25.019662

Tight focusing of laser light using a chromium Fresnel zone plate

V. V. Kotlyar, S. S. Stafeev^*, A. G. Nalimov, M. V. Kotlyar, Liam O'Faolain, E. S. Kozlova

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

Using near-field scanning microscopy, we demonstrate that a 15-µm zone plate fabricated in a 70-nm chromium film sputtered on a glass substrate and having a focal length and outermost zone's width equal to the incident wavelength λ = 532 nm, focuses a circularly polarized Gaussian beam into a circular subwavelength focal spot whose diameter at the full-width of half-maximum intensity is FWHM = 0.47λ. This value is in near-accurate agreement with the FDTD-aided numerical estimate of FWHM = 0.46λ. When focusing a Gaussian beam linearly polarized along the y-axis, an elliptic subwavelength focal spot is experimentally found to measure FWHMx = 0.42λ (estimated value FWHMx = 0.40λ) and FWHMy = 0.64λ. The subwavelength focal spots presented here are the tightest among all attained so far for homogeneously polarized beams by use of non-immersion amplitude zone plates.

Original language	English
Pages (from-to)	19662-19671
Number of pages	10
Journal	Optics Express
Volume	25
Issue number	17
Early online date	7 Aug 2017
DOIs	https://doi.org/10.1364/OE.25.019662
Publication status	Published - 21 Aug 2017

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© 2017, Optical Society of America. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1364
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title = "Tight focusing of laser light using a chromium Fresnel zone plate",

abstract = "Using near-field scanning microscopy, we demonstrate that a 15-µm zone plate fabricated in a 70-nm chromium film sputtered on a glass substrate and having a focal length and outermost zone's width equal to the incident wavelength λ = 532 nm, focuses a circularly polarized Gaussian beam into a circular subwavelength focal spot whose diameter at the full-width of half-maximum intensity is FWHM = 0.47λ. This value is in near-accurate agreement with the FDTD-aided numerical estimate of FWHM = 0.46λ. When focusing a Gaussian beam linearly polarized along the y-axis, an elliptic subwavelength focal spot is experimentally found to measure FWHMx = 0.42λ (estimated value FWHMx = 0.40λ) and FWHMy = 0.64λ. The subwavelength focal spots presented here are the tightest among all attained so far for homogeneously polarized beams by use of non-immersion amplitude zone plates.",

author = "Kotlyar, {V. V.} and Stafeev, {S. S.} and Nalimov, {A. G.} and Kotlyar, {M. V.} and Liam O'Faolain and Kozlova, {E. S.}",

note = "Funding: Russian Scientific Foundation (17-19-01186).",

year = "2017",

month = aug,

day = "21",

doi = "10.1364/OE.25.019662",

language = "English",

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journal = "Optics Express",

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TY - JOUR

T1 - Tight focusing of laser light using a chromium Fresnel zone plate

AU - Kotlyar, V. V.

AU - Stafeev, S. S.

AU - Nalimov, A. G.

AU - Kotlyar, M. V.

AU - O'Faolain, Liam

AU - Kozlova, E. S.

N1 - Funding: Russian Scientific Foundation (17-19-01186).

PY - 2017/8/21

Y1 - 2017/8/21

N2 - Using near-field scanning microscopy, we demonstrate that a 15-µm zone plate fabricated in a 70-nm chromium film sputtered on a glass substrate and having a focal length and outermost zone's width equal to the incident wavelength λ = 532 nm, focuses a circularly polarized Gaussian beam into a circular subwavelength focal spot whose diameter at the full-width of half-maximum intensity is FWHM = 0.47λ. This value is in near-accurate agreement with the FDTD-aided numerical estimate of FWHM = 0.46λ. When focusing a Gaussian beam linearly polarized along the y-axis, an elliptic subwavelength focal spot is experimentally found to measure FWHMx = 0.42λ (estimated value FWHMx = 0.40λ) and FWHMy = 0.64λ. The subwavelength focal spots presented here are the tightest among all attained so far for homogeneously polarized beams by use of non-immersion amplitude zone plates.

AB - Using near-field scanning microscopy, we demonstrate that a 15-µm zone plate fabricated in a 70-nm chromium film sputtered on a glass substrate and having a focal length and outermost zone's width equal to the incident wavelength λ = 532 nm, focuses a circularly polarized Gaussian beam into a circular subwavelength focal spot whose diameter at the full-width of half-maximum intensity is FWHM = 0.47λ. This value is in near-accurate agreement with the FDTD-aided numerical estimate of FWHM = 0.46λ. When focusing a Gaussian beam linearly polarized along the y-axis, an elliptic subwavelength focal spot is experimentally found to measure FWHMx = 0.42λ (estimated value FWHMx = 0.40λ) and FWHMy = 0.64λ. The subwavelength focal spots presented here are the tightest among all attained so far for homogeneously polarized beams by use of non-immersion amplitude zone plates.

U2 - 10.1364/OE.25.019662

DO - 10.1364/OE.25.019662

M3 - Article

AN - SCOPUS:85027731754

SN - 1094-4087

VL - 25

SP - 19662

EP - 19671

JO - Optics Express

JF - Optics Express

IS - 17

ER -

Tight focusing of laser light using a chromium Fresnel zone plate

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