Wentao Qiu, Huihui Lu, Fadi Issam Baida, Maria-Pilar Bernal, "Ultra-compact on-chip slot Bragg grating structure for small electric field detection," Photonics Res. 5, 212 (2017)

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- Photonics Research
- Vol. 5, Issue 3, 212 (2017)

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 W air 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 , W air = 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 W d in the 2D-FDTD simulations. The period of grating a and the width of air groove W air 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 , W air = 260 nm , W d = 290 nm , and number of air grooves on each side of defect N = 5 .
![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.](/Images/icon/loading.gif)
Fig. 3. E-field amplitude distribution of E z 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 , W air = 260 nm , H = 500 nm , W si = 200 nm , W s = 100 nm , number of air grooves on each side of defect N = 7 and varying defect size W d .

Fig. 6. 3D-FDTD zero-order normalized transmission of slot Bragg grating structure with parameters of a = 380 nm , W air = 260 nm , W si = 200 nm , W s = 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 W d = 340 , 360 and 380 nm. (b) Slot etching depth H = 700 nm while varying W d = 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 H si . (b) 3D-FDTD simulated zero-order normalized transmission with structure parameters as a = 380 nm , W air = 260 nm , H = 500 nm , W si = 200 nm , W s = 100 nm , number of air grooves on each side of defect N = 7 , W d = 380 nm , and varying the silicon height H si .

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 , W air = 260 nm , W d = 340 nm , number of air grooves N = 7 and with different Δ n values of the LN. (b) λ res versus different Δ n deduced from (a).
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Table 1. PBG Size of 10 Air Grooves, a = 340 nm while Varying the Value of W air (Units in nm)
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Table 2. PBG Center Varying with a and W air while Keeping W air / a Around 0.7 (Units in nm)
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Table 3. Resonance Properties Versus the Defect Size W d
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Table 4. Resonance Properties Versus the Number of Air Grooves N

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