Evaluation of the E‐polarization focusing ability in Thz range for microsize cylindrical parabolic reflector made of thin dielectric layer sandwiched between graphene
Abstract We consider two‐dimensional (2‐D) thin dielectric parabolic reflector, covered with graphene from both sides, illuminated symmetrically by an E‐polarized electromagnetic plane wave. Our aim is to estimate the focussing ability of such a composite reflector depending on the graphene paramete...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-08-01
|
| Series: | IET Microwaves, Antennas & Propagation |
| Subjects: | |
| Online Access: | https://doi.org/10.1049/mia2.12161 |
| _version_ | 1828137861890703360 |
|---|---|
| author | Taner Oğuzer Ayhan Altıntaş |
| author_facet | Taner Oğuzer Ayhan Altıntaş |
| author_sort | Taner Oğuzer |
| collection | DOAJ |
| description | Abstract We consider two‐dimensional (2‐D) thin dielectric parabolic reflector, covered with graphene from both sides, illuminated symmetrically by an E‐polarized electromagnetic plane wave. Our aim is to estimate the focussing ability of such a composite reflector depending on the graphene parameters. We use a version of the two‐side generalized boundary condition, modified for a thin multilayer case. The scattering is formulated as an electromagnetic boundary‐value problem; it is cast to a set of two coupled singular integral equations that are further subjected to analytical regularisation based on the known Riemann–Hilbert problem solution. Thanks to this procedure, the numerical results are computed from a Fredholm second‐kind matrix equation that guarantees convergence and provides easily controlled accuracy. In the lower part of the THz range, high values of the focusing ability are observed even for a thin reflector; they are greater than for a purely dielectric reflector and a free standing graphene reflector. On the other hand, a regime of almost full transparency, intrinsic for the dielectric layer, can spoil focusing ability. Novel aspect is that the location in frequency of this effect can be controlled, in wide range, by changing the chemical potential of graphene. |
| first_indexed | 2024-04-11T18:26:37Z |
| format | Article |
| id | doaj.art-92b6371c040f4537bade87eeb8ec4ae8 |
| institution | Directory Open Access Journal |
| issn | 1751-8725 1751-8733 |
| language | English |
| last_indexed | 2024-04-11T18:26:37Z |
| publishDate | 2021-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | IET Microwaves, Antennas & Propagation |
| spelling | doaj.art-92b6371c040f4537bade87eeb8ec4ae82022-12-22T04:09:35ZengWileyIET Microwaves, Antennas & Propagation1751-87251751-87332021-08-0115101240124810.1049/mia2.12161Evaluation of the E‐polarization focusing ability in Thz range for microsize cylindrical parabolic reflector made of thin dielectric layer sandwiched between grapheneTaner Oğuzer0Ayhan Altıntaş1Electrical and Electronics Engineering Deparment Dokuz Eylul University, Buca Izmir TurkeyElectrical and Electronics Engineering Department Bilkent University Ankara TurkeyAbstract We consider two‐dimensional (2‐D) thin dielectric parabolic reflector, covered with graphene from both sides, illuminated symmetrically by an E‐polarized electromagnetic plane wave. Our aim is to estimate the focussing ability of such a composite reflector depending on the graphene parameters. We use a version of the two‐side generalized boundary condition, modified for a thin multilayer case. The scattering is formulated as an electromagnetic boundary‐value problem; it is cast to a set of two coupled singular integral equations that are further subjected to analytical regularisation based on the known Riemann–Hilbert problem solution. Thanks to this procedure, the numerical results are computed from a Fredholm second‐kind matrix equation that guarantees convergence and provides easily controlled accuracy. In the lower part of the THz range, high values of the focusing ability are observed even for a thin reflector; they are greater than for a purely dielectric reflector and a free standing graphene reflector. On the other hand, a regime of almost full transparency, intrinsic for the dielectric layer, can spoil focusing ability. Novel aspect is that the location in frequency of this effect can be controlled, in wide range, by changing the chemical potential of graphene.https://doi.org/10.1049/mia2.12161boundary‐value problemselectromagnetic wave diffractionelectromagnetic wave scatteringFredholm integral equationsintegral equationsmatrix algebra |
| spellingShingle | Taner Oğuzer Ayhan Altıntaş Evaluation of the E‐polarization focusing ability in Thz range for microsize cylindrical parabolic reflector made of thin dielectric layer sandwiched between graphene IET Microwaves, Antennas & Propagation boundary‐value problems electromagnetic wave diffraction electromagnetic wave scattering Fredholm integral equations integral equations matrix algebra |
| title | Evaluation of the E‐polarization focusing ability in Thz range for microsize cylindrical parabolic reflector made of thin dielectric layer sandwiched between graphene |
| title_full | Evaluation of the E‐polarization focusing ability in Thz range for microsize cylindrical parabolic reflector made of thin dielectric layer sandwiched between graphene |
| title_fullStr | Evaluation of the E‐polarization focusing ability in Thz range for microsize cylindrical parabolic reflector made of thin dielectric layer sandwiched between graphene |
| title_full_unstemmed | Evaluation of the E‐polarization focusing ability in Thz range for microsize cylindrical parabolic reflector made of thin dielectric layer sandwiched between graphene |
| title_short | Evaluation of the E‐polarization focusing ability in Thz range for microsize cylindrical parabolic reflector made of thin dielectric layer sandwiched between graphene |
| title_sort | evaluation of the e polarization focusing ability in thz range for microsize cylindrical parabolic reflector made of thin dielectric layer sandwiched between graphene |
| topic | boundary‐value problems electromagnetic wave diffraction electromagnetic wave scattering Fredholm integral equations integral equations matrix algebra |
| url | https://doi.org/10.1049/mia2.12161 |
| work_keys_str_mv | AT taneroguzer evaluationoftheepolarizationfocusingabilityinthzrangeformicrosizecylindricalparabolicreflectormadeofthindielectriclayersandwichedbetweengraphene AT ayhanaltıntas evaluationoftheepolarizationfocusingabilityinthzrangeformicrosizecylindricalparabolicreflectormadeofthindielectriclayersandwichedbetweengraphene |