Nanophotonic on-chip hybrid plasmonic electro-optic modulator with phase change materials

Mandeep Singh; Sanjeev Kumar Raghuwanshi; T. Srinivas

doi:10.1016/j.physleta.2019.07.004

Nanophotonic on-chip hybrid plasmonic electro-optic modulator with phase change materials

Mandeep Singh^*
, Sanjeev Kumar Raghuwanshi
, T. Srinivas

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

A vertical hybrid plasmonic waveguide (HPWG) modulator incorporating Au nano-rings and operating in the near-infrared (NIR) band is proposed using phase change chalcogenide thin film (Ge₂Sb₂Te₅, commonly known as GST). It is shown that with amorphous to crystalline phase transition of GST, significant modulation depths can be achieved in the optical C-band. Further, localized surface plasmon resonance (LSPR) excitations from the Au nano-ring embedded in the low-indexed slot region is used to enhance the overall performance of the reported GST based electro-optic modulator. In addition, significant wavelength shifts, and improved extinction ratio (ER) is obtained by varying Au nano-ring radius and other geometrical parameters. Our finite element method based 3D-COMSOL numerical simulations reveal that 12.24dB/μm (9.3dB/μm) extinction ratio per unit length can be achieved with (without) Au nano-rings considering r=80 nm; L=500 nm; and λ=1.56 um, respectively.

Original language	English
Pages (from-to)	3196-3199
Number of pages	4
Journal	Physics Letters, Section A: General, Atomic and Solid State Physics
Volume	383
Issue number	25
DOIs	https://doi.org/10.1016/j.physleta.2019.07.004
Publication status	Published - 02-09-2019

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1016/j.physleta.2019.07.004

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@article{2e6725d2b14747dca64f17efae3a8cab,

title = "Nanophotonic on-chip hybrid plasmonic electro-optic modulator with phase change materials",

abstract = "A vertical hybrid plasmonic waveguide (HPWG) modulator incorporating Au nano-rings and operating in the near-infrared (NIR) band is proposed using phase change chalcogenide thin film (Ge2Sb2Te5, commonly known as GST). It is shown that with amorphous to crystalline phase transition of GST, significant modulation depths can be achieved in the optical C-band. Further, localized surface plasmon resonance (LSPR) excitations from the Au nano-ring embedded in the low-indexed slot region is used to enhance the overall performance of the reported GST based electro-optic modulator. In addition, significant wavelength shifts, and improved extinction ratio (ER) is obtained by varying Au nano-ring radius and other geometrical parameters. Our finite element method based 3D-COMSOL numerical simulations reveal that 12.24dB/μm (9.3dB/μm) extinction ratio per unit length can be achieved with (without) Au nano-rings considering r=80 nm; L=500 nm; and λ=1.56 um, respectively.",

author = "Mandeep Singh and Raghuwanshi, \{Sanjeev Kumar\} and T. Srinivas",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

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doi = "10.1016/j.physleta.2019.07.004",

language = "English",

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journal = "Physics Letters, Section A: General, Atomic and Solid State Physics",

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TY - JOUR

T1 - Nanophotonic on-chip hybrid plasmonic electro-optic modulator with phase change materials

AU - Singh, Mandeep

AU - Raghuwanshi, Sanjeev Kumar

AU - Srinivas, T.

PY - 2019/9/2

Y1 - 2019/9/2

N2 - A vertical hybrid plasmonic waveguide (HPWG) modulator incorporating Au nano-rings and operating in the near-infrared (NIR) band is proposed using phase change chalcogenide thin film (Ge2Sb2Te5, commonly known as GST). It is shown that with amorphous to crystalline phase transition of GST, significant modulation depths can be achieved in the optical C-band. Further, localized surface plasmon resonance (LSPR) excitations from the Au nano-ring embedded in the low-indexed slot region is used to enhance the overall performance of the reported GST based electro-optic modulator. In addition, significant wavelength shifts, and improved extinction ratio (ER) is obtained by varying Au nano-ring radius and other geometrical parameters. Our finite element method based 3D-COMSOL numerical simulations reveal that 12.24dB/μm (9.3dB/μm) extinction ratio per unit length can be achieved with (without) Au nano-rings considering r=80 nm; L=500 nm; and λ=1.56 um, respectively.

AB - A vertical hybrid plasmonic waveguide (HPWG) modulator incorporating Au nano-rings and operating in the near-infrared (NIR) band is proposed using phase change chalcogenide thin film (Ge2Sb2Te5, commonly known as GST). It is shown that with amorphous to crystalline phase transition of GST, significant modulation depths can be achieved in the optical C-band. Further, localized surface plasmon resonance (LSPR) excitations from the Au nano-ring embedded in the low-indexed slot region is used to enhance the overall performance of the reported GST based electro-optic modulator. In addition, significant wavelength shifts, and improved extinction ratio (ER) is obtained by varying Au nano-ring radius and other geometrical parameters. Our finite element method based 3D-COMSOL numerical simulations reveal that 12.24dB/μm (9.3dB/μm) extinction ratio per unit length can be achieved with (without) Au nano-rings considering r=80 nm; L=500 nm; and λ=1.56 um, respectively.

UR - https://www.scopus.com/pages/publications/85068520708

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AN - SCOPUS:85068520708

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VL - 383

SP - 3196

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JO - Physics Letters, Section A: General, Atomic and Solid State Physics

JF - Physics Letters, Section A: General, Atomic and Solid State Physics

IS - 25

ER -

Nanophotonic on-chip hybrid plasmonic electro-optic modulator with phase change materials

Abstract

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