Author Affiliations
1Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Department of Optoelectronic Engineering, Jinan University, Guangzhou, China2Département d’Optique P.M. Duffieux, Institut FEMTO-ST, UMR 6174 CNRS Université Bourgogne Franche-Comté, 15B Avenue des Montboucons, 25030 Besançon Cedex, France3e-mail: thuihuilu@jnu.edu.cnshow less
Fig. 1. (a) Sketch of 2D SWG considered in the 2D-FDTD simulations. (b) Sketch of 2D slot Bragg grating structure considered in the 2D-FDTD simulations. Period of grating a and width of air groove Wair is denoted in the figure. (c) Incident E-field profile in the 2D-FDTD slot Bragg grating simulations. The LN slot, silicon rails, and air ambient medium are denoted, respectively, in the figure. (d) Normalized transmission of 2D slot Bragg grating structure with parameters of a=340 nm, Wair=200 nm, and the number of air grooves N=10.
Fig. 2. (a) Sketch of 2D slot Bragg gating structure with a defect size of Wd in the 2D-FDTD simulations. The period of grating a and the width of air groove Wair is denoted in the figure. (b) Normalized transmission of 2D slot Bragg grating structure with a symmetric F-P cavity with the parameters of a=370 nm, Wair=260 nm, Wd=290 nm, and number of air grooves on each side of defect N=5.
Fig. 3. E-field amplitude distribution of Ez component along the Bragg grating structures [the black lines show the contour of the structures with the same parameters as in Fig. 2(b)] with excitation wavelength at (a) resonance peak wavelength of 1556 nm, (b) off-resonance wavelength of 1650 nm.
Fig. 4. (a) Sketch of 3D simulated structure. (b) Zero-order normalized transmission of 3D slot Bragg grating structure with different numbers of air grooves on each side of the F-P cavity.
Fig. 5. 3D-FDTD simulated zero-order normalized transmission with structure parameters as a=380 nm, Wair=260 nm, H=500 nm, Wsi=200 nm, Ws=100 nm, number of air grooves on each side of defect N=7 and varying defect size Wd.
Fig. 6. 3D-FDTD zero-order normalized transmission of slot Bragg grating structure with parameters of a=380 nm, Wair=260 nm, Wsi=200 nm, Ws=100 nm and the number of air grooves on each side of defect N=7 and with (a) slot etching depth H=400 nm while varying Wd=340, 360 and 380 nm. (b) Slot etching depth H=700 nm while varying Wd=320, 340, 360, and 400 nm.
Fig. 7. (a) Sketch of Bragg grating with silicon height larger than LN slot height. The air grooves etching depth equal to Hsi. (b) 3D-FDTD simulated zero-order normalized transmission with structure parameters as a=380 nm, Wair=260 nm, H=500 nm, Wsi=200 nm, Ws=100 nm, number of air grooves on each side of defect N=7, Wd=380 nm, and varying the silicon height Hsi.
Fig. 8. (a) 3D FDTD normalized transmission calculated by Poynting energy flux at the output of the WG with parameters of H=700 nm, a=380 nm, Wair=260 nm, Wd=340 nm, number of air grooves N=7 and with different Δn values of the LN. (b) λres versus different Δn deduced from (a).
| | PBG Size | PBG Center | 70 | 0.209 | 154 | 1639 | 100 | 0.294 | 222 | 1613 | 140 | 0.411 | 250 | 1573 | 170 | 0.5 | 232 | 1542 | 200 | 0.588 | 258 | 1477 | 240 | 0.705 | 232 | 1472 | 270 | 0.794 | 190 | 1441 |
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Table 1. PBG Size of 10 Air Grooves, a=340 nm while Varying the Value of Wair (Units in nm)
and | | PBG Size | PBG Center | , | 0.6857 | 252 | 1508 | , | 0.7027 | 274 | 1555 | , | 0.69 | 296 | 1612 | , | 0.7 | 304 | 1634 | , | 0.7 | 342 | 1732 |
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Table 2. PBG Center Varying with a and Wair while Keeping Wair/a Around 0.7 (Units in nm)
(nm) | | Transmittance at | | 210 | 1474 | 0.955 | 3.27 | 260 | 1524 | 0.954 | 3.98 | 290 | 1556 | 0.962 | 4.03 | 310 | 1578 | 0.961 | 3.87 | 360 | 1630 | 0.975 | 3.24 | 410 | 1674 | 0.978 | 2.53 |
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Table 3. Resonance Properties Versus the Defect Size Wd
| | Transmittance at | | 4 | 1556 | 0.949 | 2.45 | 5 | 1556 | 0.962 | 4.03 | 6 | 1554 | 0.913 | 6.31 | 7 | 1554 | 0.668 | 5.08 | 8 | 1554 | 0.378 | 5.74 |
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Table 4. Resonance Properties Versus the Number of Air Grooves N