Geometric Influence on Optical Bistability and Local Field Enhancement in Core-Shell Nanocomposites

Shewa Getachew Mamo; Eyasu Tadese Muda

doi:doi:10.11648/j.nsnm.20250901.12

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Geometric Influence on Optical Bistability and Local Field Enhancement in Core-Shell Nanocomposites

Shewa Getachew Mamo^*

, Eyasu Tadese Muda

Published in Nanoscience and Nanometrology (Volume 9, Issue 1)

Received: 30 May 2025 Accepted: 25 June 2025 Published: 25 September 2025

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Abstract

This work investigates the role of geometric shape in tuning the optical bistability (OB) and local field enhancement factor (LFEF) of metal-coated dielectric core-shell (CS) nanoinclusions embedded in nonlinear dielectric host matrices. Through quasi-static analysis and Drude-based modeling, the study reveals that spherical and cylindrical nanoinclusions exhibit distinct OB thresholds and LFEF behaviors depending on their radii, dielectric environments, and shape-induced plasmonic resonances. Spherical CS nanostructures display stronger OB responses and field confinement at lower thresholds than their cylindrical counterparts. Results show that increasing host permittivity significantly widens the OB region, while reducing nanoinclusion size enhances optical nonlinearity. This investigation underscores the sensitivity of nonlinear optical responses to geometry, shell thickness, and host environment, providing valuable insights for designing tunable photonic components, including switches and optical memory devices.

Published in	Nanoscience and Nanometrology (Volume 9, Issue 1)
DOI	10.11648/j.nsnm.20250901.12
Page(s)	11-19
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2025. Published by Science Publishing Group

Keywords

Enhancement Factor, Optical Bistability, Host Matrix, Nanocomposites, Core-shell

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APA Style

Mamo, S. G., Muda, E. T. (2025). Geometric Influence on Optical Bistability and Local Field Enhancement in Core-Shell Nanocomposites. Nanoscience and Nanometrology, 9(1), 11-19. https://doi.org/10.11648/j.nsnm.20250901.12

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ACS Style

Mamo, S. G.; Muda, E. T. Geometric Influence on Optical Bistability and Local Field Enhancement in Core-Shell Nanocomposites. Nanosci. Nanometrol. 2025, 9(1), 11-19. doi: 10.11648/j.nsnm.20250901.12

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AMA Style

Mamo SG, Muda ET. Geometric Influence on Optical Bistability and Local Field Enhancement in Core-Shell Nanocomposites. Nanosci Nanometrol. 2025;9(1):11-19. doi: 10.11648/j.nsnm.20250901.12

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@article{10.11648/j.nsnm.20250901.12,
  author = {Shewa Getachew Mamo and Eyasu Tadese Muda},
  title = {Geometric Influence on Optical Bistability and Local Field Enhancement in Core-Shell Nanocomposites
},
  journal = {Nanoscience and Nanometrology},
  volume = {9},
  number = {1},
  pages = {11-19},
  doi = {10.11648/j.nsnm.20250901.12},
  url = {https://doi.org/10.11648/j.nsnm.20250901.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.nsnm.20250901.12},
  abstract = {This work investigates the role of geometric shape in tuning the optical bistability (OB) and local field enhancement factor (LFEF) of metal-coated dielectric core-shell (CS) nanoinclusions embedded in nonlinear dielectric host matrices. Through quasi-static analysis and Drude-based modeling, the study reveals that spherical and cylindrical nanoinclusions exhibit distinct OB thresholds and LFEF behaviors depending on their radii, dielectric environments, and shape-induced plasmonic resonances. Spherical CS nanostructures display stronger OB responses and field confinement at lower thresholds than their cylindrical counterparts. Results show that increasing host permittivity significantly widens the OB region, while reducing nanoinclusion size enhances optical nonlinearity. This investigation underscores the sensitivity of nonlinear optical responses to geometry, shell thickness, and host environment, providing valuable insights for designing tunable photonic components, including switches and optical memory devices.
},
 year = {2025}
}

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TY  - JOUR
T1  - Geometric Influence on Optical Bistability and Local Field Enhancement in Core-Shell Nanocomposites

AU  - Shewa Getachew Mamo
AU  - Eyasu Tadese Muda
Y1  - 2025/09/25
PY  - 2025
N1  - https://doi.org/10.11648/j.nsnm.20250901.12
DO  - 10.11648/j.nsnm.20250901.12
T2  - Nanoscience and Nanometrology
JF  - Nanoscience and Nanometrology
JO  - Nanoscience and Nanometrology
SP  - 11
EP  - 19
PB  - Science Publishing Group
SN  - 2472-3630
UR  - https://doi.org/10.11648/j.nsnm.20250901.12
AB  - This work investigates the role of geometric shape in tuning the optical bistability (OB) and local field enhancement factor (LFEF) of metal-coated dielectric core-shell (CS) nanoinclusions embedded in nonlinear dielectric host matrices. Through quasi-static analysis and Drude-based modeling, the study reveals that spherical and cylindrical nanoinclusions exhibit distinct OB thresholds and LFEF behaviors depending on their radii, dielectric environments, and shape-induced plasmonic resonances. Spherical CS nanostructures display stronger OB responses and field confinement at lower thresholds than their cylindrical counterparts. Results show that increasing host permittivity significantly widens the OB region, while reducing nanoinclusion size enhances optical nonlinearity. This investigation underscores the sensitivity of nonlinear optical responses to geometry, shell thickness, and host environment, providing valuable insights for designing tunable photonic components, including switches and optical memory devices.

VL  - 9
IS  - 1
ER  -

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Author Information

Shewa Getachew Mamo

Department of Physics, Wolkite University, Welkite, Ethiopia

Contact Email

http://orcid.org/0009-0005-8265-0115
Eyasu Tadese Muda

Department of Physics, Dilla University, Dilla, Ethiopia

Contact Email

http://orcid.org/0009-0008-1393-8440

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APA Style

Mamo, S. G., Muda, E. T. (2025). Geometric Influence on Optical Bistability and Local Field Enhancement in Core-Shell Nanocomposites. Nanoscience and Nanometrology, 9(1), 11-19. https://doi.org/10.11648/j.nsnm.20250901.12

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ACS Style

Mamo, S. G.; Muda, E. T. Geometric Influence on Optical Bistability and Local Field Enhancement in Core-Shell Nanocomposites. Nanosci. Nanometrol. 2025, 9(1), 11-19. doi: 10.11648/j.nsnm.20250901.12

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AMA Style

Mamo SG, Muda ET. Geometric Influence on Optical Bistability and Local Field Enhancement in Core-Shell Nanocomposites. Nanosci Nanometrol. 2025;9(1):11-19. doi: 10.11648/j.nsnm.20250901.12

Copy | Download

@article{10.11648/j.nsnm.20250901.12,
  author = {Shewa Getachew Mamo and Eyasu Tadese Muda},
  title = {Geometric Influence on Optical Bistability and Local Field Enhancement in Core-Shell Nanocomposites
},
  journal = {Nanoscience and Nanometrology},
  volume = {9},
  number = {1},
  pages = {11-19},
  doi = {10.11648/j.nsnm.20250901.12},
  url = {https://doi.org/10.11648/j.nsnm.20250901.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.nsnm.20250901.12},
  abstract = {This work investigates the role of geometric shape in tuning the optical bistability (OB) and local field enhancement factor (LFEF) of metal-coated dielectric core-shell (CS) nanoinclusions embedded in nonlinear dielectric host matrices. Through quasi-static analysis and Drude-based modeling, the study reveals that spherical and cylindrical nanoinclusions exhibit distinct OB thresholds and LFEF behaviors depending on their radii, dielectric environments, and shape-induced plasmonic resonances. Spherical CS nanostructures display stronger OB responses and field confinement at lower thresholds than their cylindrical counterparts. Results show that increasing host permittivity significantly widens the OB region, while reducing nanoinclusion size enhances optical nonlinearity. This investigation underscores the sensitivity of nonlinear optical responses to geometry, shell thickness, and host environment, providing valuable insights for designing tunable photonic components, including switches and optical memory devices.
},
 year = {2025}
}

Copy | Download

TY  - JOUR
T1  - Geometric Influence on Optical Bistability and Local Field Enhancement in Core-Shell Nanocomposites

AU  - Shewa Getachew Mamo
AU  - Eyasu Tadese Muda
Y1  - 2025/09/25
PY  - 2025
N1  - https://doi.org/10.11648/j.nsnm.20250901.12
DO  - 10.11648/j.nsnm.20250901.12
T2  - Nanoscience and Nanometrology
JF  - Nanoscience and Nanometrology
JO  - Nanoscience and Nanometrology
SP  - 11
EP  - 19
PB  - Science Publishing Group
SN  - 2472-3630
UR  - https://doi.org/10.11648/j.nsnm.20250901.12
AB  - This work investigates the role of geometric shape in tuning the optical bistability (OB) and local field enhancement factor (LFEF) of metal-coated dielectric core-shell (CS) nanoinclusions embedded in nonlinear dielectric host matrices. Through quasi-static analysis and Drude-based modeling, the study reveals that spherical and cylindrical nanoinclusions exhibit distinct OB thresholds and LFEF behaviors depending on their radii, dielectric environments, and shape-induced plasmonic resonances. Spherical CS nanostructures display stronger OB responses and field confinement at lower thresholds than their cylindrical counterparts. Results show that increasing host permittivity significantly widens the OB region, while reducing nanoinclusion size enhances optical nonlinearity. This investigation underscores the sensitivity of nonlinear optical responses to geometry, shell thickness, and host environment, providing valuable insights for designing tunable photonic components, including switches and optical memory devices.

VL  - 9
IS  - 1
ER  -

Copy | Download