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

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

doi:doi:10.3788/COL202018.041301

Chinese Optics Letters, 2020, 18 (4): 041301, Published Online: Apr. 2, 2020

Ultra-short plasmonic polarization beam splitter-rotator using a bent directional coupler Download： 920次

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

Author Affiliations

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

Figures & Tables

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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Table1. 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[J]. Chinese Optics Letters, 2020, 18(4): 041301.

Ultra-short plasmonic polarization beam splitter-rotator using a bent directional coupler Download： 920次

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.

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

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 $G = 150 nm$ .

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 $L_{c} = 5.21 μm$ .

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

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

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

Table1. Summary of Compact Polarization Beam Splitter-Rotators

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Ultra-short plasmonic polarization beam splitter-rotator using a bent directional coupler Download： 920次

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.

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

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, Wm=305 nm, Wd=595 nm, and G=150 nm.

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, Wm=305 nm, Wd=595 nm, Rm=10 μm, and Lc=5.21 μm.

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

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

Fig. 7. Transmissions as functions of (a), (b) ΔW and (c), (d) Δh, for TM and TE mode incidence.

Table1. Summary of Compact Polarization Beam Splitter-Rotators

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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.

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 $G = 150 nm$ .

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 $L_{c} = 5.21 μm$ .

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