Generation of Spatial Spherical Focused Spots Based on Reverse Radiation of Dipole Antenna

Junjie Wang; Yanfang Yang; Ying He; Qi Li; Kunfeng Wang

doi:10.3788/AOS231679

Acta Optica Sinica, Volume. 44, Issue 10, 1026033(2024)

Generation of Spatial Spherical Focused Spots Based on Reverse Radiation of Dipole Antenna

Junjie Wang, Yanfang Yang^*, Ying He, Qi Li, and Kunfeng Wang

Author Affiliations

Department of Physics, College of Sciences, Shanghai University, Shanghai 200444, China

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Figures & Tables(7)

Fig. 1. Schematic diagram of method for generating spatial spherical focused spots. (a) 4Pi focusing system; (b) spatial dipole antenna

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Fig. 2. Creating controllable length spatial light spots. (a) $L = 4.5 λ$ ; (b) $L = 5 λ$ ; (c) $L = 5.5 λ$ ; (d) $L = 6 λ$ ; (e) $L = 6.5 λ$ ; (f) $L = 7 λ$

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Fig. 3. Plots of total intensity along $z$ and $r$ axes. (a) $L = 4.5 λ$ ; (b) $L = 5 λ$ ; (c) $L = 5.5 λ$ ; (d) $L = 6 λ$

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Fig. 4. Generating spherical focused spots in direction of optical axis, where in first row $L = 4.5 λ$ and in second row $L = 5 λ$ . (a), (d) Along x-axis; (b), (e) along y-axis; (c), (f) along z-axis

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Fig. 5. Creating spherical focused spots in any spatial direction. (a) $(θ_{0}, φ_{0}) = (25 °, 15 °)$ ;　(b) $(θ_{0}, φ_{0}) = (40 °, 110 °)$ ; (c) $(θ_{0}, φ_{0}) =$ $(70 °, 150 °)$ ; (d) $(θ_{0}, φ_{0}) = (60 °, 320 °)$

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Fig. 6. Normalized input field in pupil plane. Parameters: $L = 4 λ$ , $θ_{0} = 45 °$ . (a)-(f) $φ_{0}$ are　0°, 45°, 135°, 180°, 225°, and 315°, respectively

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Fig. 7. Normalized input field in pupil plane. Parameters: $L = 4 λ$ , $φ_{0} = 60 °$ . (a)-(f) $θ_{0}$ are 0°, 20°, 60°, 120°, 160°, and 180°, respectively

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Junjie Wang, Yanfang Yang, Ying He, Qi Li, Kunfeng Wang. Generation of Spatial Spherical Focused Spots Based on Reverse Radiation of Dipole Antenna[J]. Acta Optica Sinica, 2024, 44(10): 1026033

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Paper Information

Category: Physical Optics

Received: Oct. 20, 2023

Accepted: Nov. 30, 2023

Published Online: Apr. 18, 2024

The Author Email: Yanfang Yang (yanfangyang@shu.edu.cn)

DOI:10.3788/AOS231679

CSTR:32393.14.AOS231679

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology