Laser & Optoelectronics Progress, Volume. 60, Issue 9, 0905001(2023)
Preparation of Two-Dimensional Photonic Crystals of Polytetrafluoroethylene Based on Ultrafast Laser
Figures & Tables(25)
Fig. 1. Femtosecond laser processing system. (a) Schematic of experimental setup; (b) picture of the femtosecondlaser processing equipment
Fig. 2. Two-dimensional photonic crystal frequency selection and micropore array CAD drawing
Fig. 4. Laser processing path and morphology. (a) Multi-pulse tapping machining path; (b) concentric circle filling machining path; (c) linear reciprocating filling machining path; (d) linear reciprocating filling + multi-pulse tapping machining path; (e) multi-pulse tapping machining morphology; (f) concentric circle filling machining morphology; (g) linear reciprocating filling machining morphology; (h) linear reciprocating filling + multi-pulse tapping machining morphology
Fig. 6. Experimental results. (a) Morphology of the PTFE sheet ablated by femtosecond lasers; (b) fitting results between square of ablation diameter and logarithm of pulse energy
Fig. 9. Relationship among micropore diameter, taper, and machining power. (a) Relationship among entrance diameter, exist diameter, and processing power; (b) relationship between micropore taper and machining power
Fig. 10. Morphology of micropore entrance under different powers. (a) Pavg=7 W; (b) Pavg=8 W; (c) Pavg=9 W; (d) Pavg=10 W; (e) Pavg=11 W; (f) Pavg=12 W
Fig. 11. Morphology of micropore exist under different powers. (a) Pavg=7 W; (b) Pavg=8 W; (c) Pavg=9 W; (d) Pavg=10 W; (e) Pavg=11 W; (f) Pavg=12 W
Fig. 13. Influence of scanning speed on the quality of micropore array. (a) Relationship between micropore diameter and scanning speed; (b) relationship between micropore taper and scanning speed
Fig. 14. Morphology of micropore entrance under different scanning speeds. (a) v=60 mm/s; (b) v=80 mm/s; (c) v=100 mm/s; (d) v=120 mm/s; (e) v=140 mm/s; (f) v=160 mm/s; (g) v=180 mm/s; (h) v=200 mm/s
Fig. 15. Morphology of micropore exist under different scanning speeds. (a) v=60 mm/s; (b) v=80 mm/s; (c) v=100 mm/s; (d) v=120 mm/s; (e) v=140 mm/s; (f) v=160 mm/s; (g) v=180 mm/s; (h) v=200 mm/s
Fig. 17. Relationship among micropore diameter, taper, and scanning times. (a) Relationship among entrance diameter, exist diameter, and scanning times; (b) relationship between micropore taper and scanning times
Fig. 18. Morphology of micropore entrance under different scanning times. (a) n=7; (b) n=8; (c) n=9; (d) n=10; (e) n=11; (f) n=12
Fig. 19. Morphology of micropore exist under different scanning times.(a) n=7; (b) n=8; (c) n=9; (d) n=10; (e) n=11; (f) n=12
Table 1. Technical parameters of lasers
View tableTable 1. Technical parameters of lasers
Technical parameter Value Wavelength /nm 1040 Average power /W 0-16 Repeat frequency /kHz 100 Pulse duration /fs 388 Focal spot diameter /μm 14
Table 2. Physical and chemical parameters of experimental sample PTFE
View tableTable 2. Physical and chemical parameters of experimental sample PTFE
Technical parameter Value Melting point /℃ 327-342 Flammability VTM-2 Moisture absorption /% <0.01 Surface resistivity /Ω >1×1010 Volume resistivity /（Ω·cm） >1×1015 Dielectric dissipation factor 0.001-0.003 Coefficient thermal expansion /（106·℃-1） 22 Thickness of PTFE /µm 280 Refractive index /% 1.37
Table 3. Micropore morphology parameters under different processing paths.
View tableTable 3. Micropore morphology parameters under different processing paths.
Machining path Dmax /µm Dmin /µm Roundness Heat affected zone /µm Multi-pulse tapping 101.02 100.26 0.9925 36.984 Concentric circle filling 111.56 107.53 0.9639 69.198 Linear reciprocating filling 96.22 80.93 0.8411 52.196 Linear reciprocating filling+multi-pulse tapping 113.39 102.82 0.9068 42.793
Table 4. Experimental data of single-pulse damage threshold on PTFE surface
View tableTable 4. Experimental data of single-pulse damage threshold on PTFE surface
Number Pavg /W D /µm ln Pavg D2 /µm2 1 1.93 19.75 0.66 390.06 2 2.55 20.58 0.94 423.54 3 3.19 21.26 1.16 451.99 4 3.84 21.82 1.35 476.11 5 4.48 22.26 1.50 495.51 6 5.12 22.65 1.63 513.02 7 5.78 23.03 1.75 530.38 8 6.47 23.24 1.87 540.10 9 7.15 23.44 1.97 549.43 10 7.84 23.63 2.06 558.38
Table 5. Experimental data of micropore array prepared by PTFE sheet under femtosecond laser
View tableTable 5. Experimental data of micropore array prepared by PTFE sheet under femtosecond laser
Number Pavg /W Scanning speed /（mm·s-1） Scanning times DEn /µm DEx /µm Taper /（°） 1 7 100 9 88.05 51.28 3.76 2 8 100 9 94.30 58.48 3.66 3 9 100 9 99.97 64.81 3.59 4 10 100 9 104.99 70.54 3.52 5 11 100 9 108.02 75.00 3.48 6 12 100 9 108.31 75.3 3.46 7 9 60 9 115.27 80.84 3.42 8 9 80 9 110.57 74.94 3.54 9 9 120 9 96.13 62.17 3.65 10 9 140 9 88.87 57.91 3.71 11 9 160 9 84.98 50.95 3.78 12 9 180 9 84.76 39.55 4.61 13 9 200 9 83.66 32.71 5.20 14 9 100 7 92.52 47.28 4.62 15 9 100 8 97.26 55.65 4.25 16 9 100 10 102.00 68.23 3.45 17 9 100 11 105.21 73.98 3.19 18 9 100 12 105.57 74.50 3.16
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Zhengbo Wang, Chao Wu, Li Cheng, Zhaolei Diao. Preparation of Two-Dimensional Photonic Crystals of Polytetrafluoroethylene Based on Ultrafast Laser[J]. Laser & Optoelectronics Progress, 2023, 60(9): 0905001
Paper Information
Category: Diffraction and Gratings
Received: Oct. 17, 2021
Accepted: Nov. 29, 2021
Published Online: Apr. 24, 2023
The Author Email: Wu Chao (wind0101880@126.com)
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