• Chinese Optics Letters
  • Vol. 18, Issue 4, 041301 (2020)
Bing Bai, Li Pei*, Jingjing Zheng, Tigang Ning, and 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
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    DOI: 10.3788/COL202018.041301 Cite this Article Set citation alerts
    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 Copy Citation Text show less
    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. 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.
    Propagation constant (P) in cylindrical coordinates for the TE and TM modes in the HPW and the DW versus the waveguide width.
    Fig. 2. Propagation constant (P) in cylindrical coordinates for the TE and TM modes in the HPW and the DW versus the waveguide width.
    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. 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=305nm, Wd=595nm, and G=150nm.
    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. 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=150nm, Wm=305nm, Wd=595nm, Rm=10μm, and Lc=5.21μm.
    Wavelength dependence of the PSR. The transmission spectral responses for (a) TM and (b) TE mode input.
    Fig. 5. Wavelength dependence of the PSR. The transmission spectral responses for (a) TM and (b) TE mode input.
    PCE and CL of the PSR as a function of wavelength.
    Fig. 6. PCE and CL of the PSR as a function of wavelength.
    Transmissions as functions of (a), (b) ΔW and (c), (d) Δh, for TM and TE mode incidence.
    Fig. 7. Transmissions as functions of (a), (b) ΔW and (c), (d) Δh, for TM and TE mode incidence.
    Reference No. (*: Experiment)Coupling Length/μmER/dBIL/dB
    [7]17.4180.22
    [8]11.2300.42
    [9]7.750.91.545
    *[11]15.7180.4
    *[12]8.8270.135
    [22]8.234.70.12
    This work5.2120.63.2
    Table 1. Summary of Compact Polarization Beam Splitter-Rotators
    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
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