Ultra-short plasmonic polarization beam splitter-rotator using a bent directional coupler

Bing Bai; Li Pei; Jingjing Zheng; Tigang Ning; Jing Li

doi:10.3788/COL202018.041301

Chinese Optics Letters, Volume. 18, Issue 4, 041301(2020)

Ultra-short plasmonic polarization beam splitter-rotator using a bent directional coupler

Bing Bai, Li Pei^*, Jingjing Zheng, Tigang Ning, and Jing Li

Key Laboratory of All Optical Network and Advanced Telecommunication Network, Ministry of Education, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China

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Fig. 1. Schematic layout of the proposed PSR based on a plasmonics-assisted bent directional coupler. Inset: top view and cross section of the coupling region.

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Fig. 2. Propagation constant ( $P$ ) in cylindrical coordinates for the TE and TM modes in the HPW and the DW versus the waveguide width.

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Fig. 3. Normalized electric field distributions of supermodes at (a), (b) efficient cross-polarization coupling and weak (c) TE and (d) TM coupling conditions. Here, $W_{m} = 305 nm$ , $W_{d} = 595 nm$ , and $G = 150 nm$ .

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Fig. 4. Power distributions for (a) TM-polarized and (b) TE-polarized light inputs. The insets in (a) show the electric field distributions at the corresponding positions (black dashed lines). Here, $G = 150 nm$ , $W_{m} = 305 nm$ , $W_{d} = 595 nm$ , $R_{m} = 10 μm$ , and $L_{c} = 5.21 μm$ .

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Fig. 5. Wavelength dependence of the PSR. The transmission spectral responses for (a) TM and (b) TE mode input.

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Fig. 6. PCE and CL of the PSR as a function of wavelength.

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Fig. 7. Transmissions as functions of (a), (b) $Δ W$ and (c), (d) $Δ h$ , for TM and TE mode incidence.

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Table 1. Summary of Compact Polarization Beam Splitter-Rotators
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Table 1. Summary of Compact Polarization Beam Splitter-Rotators
Reference No. (*: Experiment) Coupling Length/μm ER/dB IL/dB
[7] 17.4 18 0.22
[8] 11.2 30 0.42
[9] 7.7 50.9 1.545
*[11] 15.7 18 0.4
*[12] 8.8 27 0.135
[22] 8.2 34.7 0.12
This work 5.21 20.6 3.2

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Bing Bai, Li Pei, Jingjing Zheng, Tigang Ning, Jing Li, "Ultra-short plasmonic polarization beam splitter-rotator using a bent directional coupler," Chin. Opt. Lett. 18, 041301 (2020)

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