Polarization-independent highly efficient generation of Airy optical beams with dielectric metasurfaces

Binbin Yu; Jing Wen; Lei Chen; Leihong Zhang; Yulong Fan; Bo Dai; Saima Kanwal; Dangyuan Lei; Dawei Zhang

doi:doi:10.1364/PRJ.390202

Photonics Research, 2020, 8 (7): 07001148, Published Online: Jun. 11, 2020

Polarization-independent highly efficient generation of Airy optical beams with dielectric metasurfaces Download： 757次

Binbin Yu ^1†Jing Wen ^1,4,*†Lei Chen ¹Leihong Zhang ¹Yulong Fan ²Bo Dai ¹Saima Kanwal ¹Dangyuan Lei ²Dawei Zhang ^1,3,5,*

Author Affiliations

¹ Engineering Research Center of Optical Instrument and Systems, Ministry of Education and Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China

² Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China

³ Shanghai Institute of Intelligent Science and Technology, Tongji University, Shanghai 200092, China

⁴ e-mail: jwen@usst.edu.cn

⁵ e-mail: dwzhang@usst.edu.cn

Figures & Tables

Fig. 1. Geometrical model for generating Airy optical beams with a metasurface.

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Fig. 2. (a) Schematic side and (b) top views of an amorphous silicon nanopillar unit with height H, diameter D, and lattice constant P on an SiO2 substrate; (c) the dielectric metasurface, composed of the above silicon nanopillars with spatially varied diameters, is imposed by a 3/2 phase for Airy optical beam generation operating under transmission mode in the near-infrared (NIR) region. Experimentally measured longitudinal and transverse field distributions at different vertical planes are superimposed on top of the metasurface.

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Fig. 3. (a) Simulated phase and (b) transmission intensity of an array of silicon nanopillars as a function of their diameter D. The lattice constant of the array is P=620 nm, and the height of the pillars is H=600 nm.

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Fig. 4. (a) A 3/2 phase pattern imposed on the metasurface; (b) simulated longitudinal field distribution profiles of the generated Airy optical beam from the position of z=50 μm to z=105 μm along the beam deflection direction; (c)–(f) simulated transverse field distribution profiles in the xy planes at z=70 μm, 80 μm, 90 μm, and 100 μm away from the metasurface.

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Fig. 5. (a) Top and (b) zoomed view SEM images of the fabricated metasurface sample; (c) schematic diagram of optical characterization setup.

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Fig. 6. (a)–(f) Simulated and (g)–(l) experimental transverse xy field patterns at the position of z=87 μm when the incident beam is LP with a polarization angle of (a), (g) 0° and (b), (h) 45°, (c), (i) left circularly polarized (LCP), (d), (j) right circularly polarized (RCP), EP with an ellipticity of (e), (k) −0.5 and (f), (l) 0.5, respectively.

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Fig. 7. Experimentally measured FWHM of the main lobe of each Airy beam along its propagation trajectory when the incident beam is LP with a polarized angle of 0° and 45°, LCP, RCP, and EP with an ellipticity of −0.5 and 0.5, respectively.

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Fig. 8. (a)–(f) Simulated and (g)–(l) experimental longitudinal field distribution profiles of the Airy beams in the yz plane at vertical positions from z=30 μm to z=100 μm when the incident beam is LP with a polarized angle of (a), (g) 0° and (b), (h) 45°, (c), (i) LCP, (d), (j) RCP, and EP with an ellipticity of (e), (k) −0.5 and (f), (l) 0.5, respectively.

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Fig. 9. (a) Simulated longitudinal field distribution profiles of the Airy beam. A sphere obstacle with a diameter of 20 μm is placed at (x,z)=(−4.1,60) μm. (b) Experimental longitudinal field distribution profiles of the Airy beam. The yellow dashed lines show the position of the thin plastic film with a microink droplet placed at z=63 μm from the metasurface.

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Table1. Summary of Our Result and Other References

References	Efficiency (%)	Material	Wavelength	Incident Light
Our result	56	Silicon	1550 nm	Polarization-insensitive
[61]	70–85 (simulation result, no experiment)	Silicon	1500 nm	Polarization-insensitive
[72]		Silver	633 nm	Polarization-insensitive
[56]		Gold	2000 nm	CP light
[60]		Gold	780 nm	CP light
[70]	63	Silicon	600–695 nm	CP light
[71]	65–75	Titanium dioxide	430 nm	CP light
[55]	13.5 ( $λ = 800 nm$ ), 4.2( $λ = 976 nm$ )	Gold	800–1100 nm	LP light
[57]	100 (theoretical result)	Aluminum	21.74 mm	LP light
[58]		Aluminum	400 μm, 750 μm	LP light

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Binbin Yu, Jing Wen, Lei Chen, Leihong Zhang, Yulong Fan, Bo Dai, Saima Kanwal, Dangyuan Lei, Dawei Zhang. Polarization-independent highly efficient generation of Airy optical beams with dielectric metasurfaces[J]. Photonics Research, 2020, 8(7): 07001148.

Polarization-independent highly efficient generation of Airy optical beams with dielectric metasurfaces Download： 757次

Fig. 1. Geometrical model for generating Airy optical beams with a metasurface.

Fig. 3. (a) Simulated phase and (b) transmission intensity of an array of silicon nanopillars as a function of their diameter D. The lattice constant of the array is P=620 nm, and the height of the pillars is H=600 nm.

Fig. 5. (a) Top and (b) zoomed view SEM images of the fabricated metasurface sample; (c) schematic diagram of optical characterization setup.

Fig. 7. Experimentally measured FWHM of the main lobe of each Airy beam along its propagation trajectory when the incident beam is LP with a polarized angle of 0° and 45°, LCP, RCP, and EP with an ellipticity of −0.5 and 0.5, respectively.

Table1. Summary of Our Result and Other References

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Polarization-independent highly efficient generation of Airy optical beams with dielectric metasurfaces Download： 757次

Fig. 1. Geometrical model for generating Airy optical beams with a metasurface.

Fig. 3. (a) Simulated phase and (b) transmission intensity of an array of silicon nanopillars as a function of their diameter D. The lattice constant of the array is P=620 nm, and the height of the pillars is H=600 nm.

Fig. 5. (a) Top and (b) zoomed view SEM images of the fabricated metasurface sample; (c) schematic diagram of optical characterization setup.

Fig. 7. Experimentally measured FWHM of the main lobe of each Airy beam along its propagation trajectory when the incident beam is LP with a polarized angle of 0° and 45°, LCP, RCP, and EP with an ellipticity of −0.5 and 0.5, respectively.

Table1. Summary of Our Result and Other References

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