Investigation of optical bistability in spheroidal core–shell nanocomposites with passive and active dielectric cores
We investigated how induced optical bistability (IOB) and bistability domain (BD) of spheroidal core–shell nanocomposites (NCs) are affected by the depolarization factor (L), metal fraction (p), and host matrix (ɛh). The NCs are composed of passive and active dielectric cores coated with a metallic...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2024-01-01
|
| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/5.0180907 |
| _version_ | 1797332080765435904 |
|---|---|
| author | Tolasa Tamasgen Hirpha Garoma Dhaba Bergaga Belayneh Mesfin Ali Sisay Shewamare Gebre |
| author_facet | Tolasa Tamasgen Hirpha Garoma Dhaba Bergaga Belayneh Mesfin Ali Sisay Shewamare Gebre |
| author_sort | Tolasa Tamasgen Hirpha |
| collection | DOAJ |
| description | We investigated how induced optical bistability (IOB) and bistability domain (BD) of spheroidal core–shell nanocomposites (NCs) are affected by the depolarization factor (L), metal fraction (p), and host matrix (ɛh). The NCs are composed of passive and active dielectric cores coated with a metallic shell and embedded in various host matrices. By employing Laplace’s equation and the Drude–Lorentz model, we calculated the electric field enhancement in various regions of the NCs and studied their IOB theoretically and numerically. The BD of the same NCs is investigated using the root analysis approach. The study reveals that when the value of L decreases, the bistable region of OB increases. However, when p increases at constant L and ɛh, the bistable region gets wider. When the value of ɛh increases, the IOB region is achieved at larger values of incident field. Moreover, the IOB produced was narrower in the passive dielectric core than in the active one, showing that the type of core material also influences the IOB of the core–shell NCs. When the value of L changes, the region of BD also changes in both types of cores. Similarly, changing the value of p in both types of cores causes the BD to vanish or emerge. Moreover, varying ɛh, BD is produced in the OB regions. Overall, the IOB and BD in each core are sensitive to changes in L, p, and ɛh. Varying these parameters leads to the possibility of tuning the bistable regions, which can be used in optical circuits, logic operations, and optical memory. |
| first_indexed | 2024-03-08T07:44:28Z |
| format | Article |
| id | doaj.art-ec9e9a20764a4cbeb923a30e030b2d9c |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-03-08T07:44:28Z |
| publishDate | 2024-01-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-ec9e9a20764a4cbeb923a30e030b2d9c2024-02-02T16:46:05ZengAIP Publishing LLCAIP Advances2158-32262024-01-01141015037015037-910.1063/5.0180907Investigation of optical bistability in spheroidal core–shell nanocomposites with passive and active dielectric coresTolasa Tamasgen Hirpha0Garoma Dhaba Bergaga1Belayneh Mesfin Ali2Sisay Shewamare Gebre3Department of Physics, Bonga University, P.O. Box 334, Bonga, EthiopiaDepartment of Physics, Addis Ababa University, P.O. Box 1176, Addis Ababa, EthiopiaDepartment of Physics, Addis Ababa University, P.O. Box 1176, Addis Ababa, EthiopiaDepartment of Physics, Wolkite University, P.O. Box 07, Wolkite, EthiopiaWe investigated how induced optical bistability (IOB) and bistability domain (BD) of spheroidal core–shell nanocomposites (NCs) are affected by the depolarization factor (L), metal fraction (p), and host matrix (ɛh). The NCs are composed of passive and active dielectric cores coated with a metallic shell and embedded in various host matrices. By employing Laplace’s equation and the Drude–Lorentz model, we calculated the electric field enhancement in various regions of the NCs and studied their IOB theoretically and numerically. The BD of the same NCs is investigated using the root analysis approach. The study reveals that when the value of L decreases, the bistable region of OB increases. However, when p increases at constant L and ɛh, the bistable region gets wider. When the value of ɛh increases, the IOB region is achieved at larger values of incident field. Moreover, the IOB produced was narrower in the passive dielectric core than in the active one, showing that the type of core material also influences the IOB of the core–shell NCs. When the value of L changes, the region of BD also changes in both types of cores. Similarly, changing the value of p in both types of cores causes the BD to vanish or emerge. Moreover, varying ɛh, BD is produced in the OB regions. Overall, the IOB and BD in each core are sensitive to changes in L, p, and ɛh. Varying these parameters leads to the possibility of tuning the bistable regions, which can be used in optical circuits, logic operations, and optical memory.http://dx.doi.org/10.1063/5.0180907 |
| spellingShingle | Tolasa Tamasgen Hirpha Garoma Dhaba Bergaga Belayneh Mesfin Ali Sisay Shewamare Gebre Investigation of optical bistability in spheroidal core–shell nanocomposites with passive and active dielectric cores AIP Advances |
| title | Investigation of optical bistability in spheroidal core–shell nanocomposites with passive and active dielectric cores |
| title_full | Investigation of optical bistability in spheroidal core–shell nanocomposites with passive and active dielectric cores |
| title_fullStr | Investigation of optical bistability in spheroidal core–shell nanocomposites with passive and active dielectric cores |
| title_full_unstemmed | Investigation of optical bistability in spheroidal core–shell nanocomposites with passive and active dielectric cores |
| title_short | Investigation of optical bistability in spheroidal core–shell nanocomposites with passive and active dielectric cores |
| title_sort | investigation of optical bistability in spheroidal core shell nanocomposites with passive and active dielectric cores |
| url | http://dx.doi.org/10.1063/5.0180907 |
| work_keys_str_mv | AT tolasatamasgenhirpha investigationofopticalbistabilityinspheroidalcoreshellnanocompositeswithpassiveandactivedielectriccores AT garomadhababergaga investigationofopticalbistabilityinspheroidalcoreshellnanocompositeswithpassiveandactivedielectriccores AT belaynehmesfinali investigationofopticalbistabilityinspheroidalcoreshellnanocompositeswithpassiveandactivedielectriccores AT sisayshewamaregebre investigationofopticalbistabilityinspheroidalcoreshellnanocompositeswithpassiveandactivedielectriccores |