High performance optical sensor based on double compound symmetric gratings

Fig. 3. Electric field intensity distributions of the eigenmode in different DCSGs with various spacings: (a) d = 200 nm, (b) d = 220 nm, (c) d = 240 nm, (d) d = 260 nm.

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Fig. 4. Reflection responses of the DCSG for the TE polarization with different d: (a) d = 200 nm, (b) d = 220 nm, (c) d = 240 nm, (d) d = 260 nm.

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Fig. 5. DCSG reflection spectra for TE polarization with different n_c.

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Fig. 6. DCSG resonance peak wavelength versus n_c.

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Table 1. Eigenvalues of the TE Eigenmode with Different d
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Table 1. Eigenvalues of the TE Eigenmode with Different d
$d$ (nm) Eigenvalue $N$
200 $1.4136 \times 10^{15} - 4.41132 \times 10^{11}$ i
220 $1.4144 \times 10^{15} - 2.30627 \times 10^{11}$ i
240 $1.4151 \times 10^{15} - 8.93895 \times 10^{10}$ i
260 $1.4154 \times 10^{15} - 1.92105 \times 10^{10}$ i

Table 2. FWHM, S, and FOM of Structures for Different d in TE Mode
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Table 2. FWHM, S, and FOM of Structures for Different d in TE Mode
$d$ (nm) FWHM (nm) S (nm/RIU) FOM
200 0.811 461 568
220 0.414 469 1133
240 0.146 471 3226
260 0.015 472 31,467

Table 3. Eigenvalues of TE Eigenmodes Corresponding to Different Refractive Indices
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Table 3. Eigenvalues of TE Eigenmodes Corresponding to Different Refractive Indices
Refractive Index $n_{c}$ Eigenvalue $N$
1.331 $1.4154 \times 10^{15} - 1.92115 \times 10^{10}$ i
1.333 $1.4136 \times 10^{15} - 2.0212 \times 10^{10}$ i
1.335 $1.4126 \times 10^{15} - 2.1336 \times 10^{10}$ i
1.337 $1.4115 \times 10^{15} - 2.2593 \times 10^{10}$ i
1.339 $1.4105 \times 10^{15} - 2.2399 \times 10^{10}$ i

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Chaoying Shi, Xiuhong Liu, Jinhua Hu, Haiyan Han, Jijun Zhao, "High performance optical sensor based on double compound symmetric gratings," Chin. Opt. Lett. 20, 021201 (2022)

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