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Midinfrared one-dimensional photonic crystal constructed from two-dimensional electride material

Midinfrared one-dimensional photonic crystal constructed from two-dimensional electride material
Midinfrared one-dimensional photonic crystal constructed from two-dimensional electride material

Dicalcium nitride (Ca2N) is a layered material that has been recently identified as a two-dimensional electride, based on first-principles calculations, where the electronic property and the optical complex dielectric function are studied using density functional theory. We find that the optical permittivity tensor is highly anisotropic, and Ca2N possesses metallic characters when the in-plane dielectric function is negative in midinfrared frequency. In addition, the enhanced midinfrared transmission property and the field distribution of one-dimensional photonic crystals composed of alternating Ca2N layers and the dielectric material are theoretically studied using the transfer-matrix method. It is found that the Ca2N photonic crystals support a series of passbands and stopbands the numbers of which increase with the thickness and the permittivity of the dielectrics. The field distributions show that the transmission resonances in the passband are attributed to the coupled Fabry-Pérot resonances of the individual reactively loaded dielectric slabs. It is also noticed that these resonances lie within certain characteristic frequency bands which are independent of the period of the photonic crystal. The low-frequency edge of the passband is highly tunable by the thickness of the electride material and the dielectric material, the permittivity of the dielectric layer, while the high-frequency edge is insensitive to the electride material thickness. Moreover, the first band gap in lower frequency is almost omnidirectional and polarization insensitive. When defect layers are introduced, the twin defect modes are found, and the frequency and the frequency interval of the two defect modes can be tuned just by changing the permittivity, the thickness and the position of the defect layer, respectively. Polarization and angular insensitive absorption bands can also be obtained for the electride-dielectric photonic crystal with a reflective substrate. These properties of electride material photonic crystals have potential applications in tunable multiband filters and absorbers in the midinfrared region.

2469-9950
Zhang, Liwei
10fce21c-16d9-4096-b07a-cf2cab1591c0
Yu, Weiyang
bbe72099-8217-4e97-9486-ed6c0bd7a0f3
Ou, Jun Yu
3fb703e3-b222-46d2-b4ee-75f296d9d64d
Wang, Qin
f0bdc716-b02a-4d97-b9b5-c6ade087c2f3
Cai, Xiaolin
614da135-04e2-43fb-b9ab-ff5b82e24809
Wang, Baoji
0c3fdbe2-b090-437b-983a-ffad1966a232
Li, Xiaohua
0a9a4ea9-0b79-4107-8dc2-d336577bc72c
Zhao, Ruiqi
680b9b5a-903b-4163-9f85-9f6ea1f9a796
Liu, Yujin
abf568f4-fc5c-4b2a-8144-291947a10f4f
Zhang, Liwei
10fce21c-16d9-4096-b07a-cf2cab1591c0
Yu, Weiyang
bbe72099-8217-4e97-9486-ed6c0bd7a0f3
Ou, Jun Yu
3fb703e3-b222-46d2-b4ee-75f296d9d64d
Wang, Qin
f0bdc716-b02a-4d97-b9b5-c6ade087c2f3
Cai, Xiaolin
614da135-04e2-43fb-b9ab-ff5b82e24809
Wang, Baoji
0c3fdbe2-b090-437b-983a-ffad1966a232
Li, Xiaohua
0a9a4ea9-0b79-4107-8dc2-d336577bc72c
Zhao, Ruiqi
680b9b5a-903b-4163-9f85-9f6ea1f9a796
Liu, Yujin
abf568f4-fc5c-4b2a-8144-291947a10f4f

Zhang, Liwei, Yu, Weiyang, Ou, Jun Yu, Wang, Qin, Cai, Xiaolin, Wang, Baoji, Li, Xiaohua, Zhao, Ruiqi and Liu, Yujin (2018) Midinfrared one-dimensional photonic crystal constructed from two-dimensional electride material. Physical Review B, 98 (7), [075434]. (doi:10.1103/PhysRevB.98.075434).

Record type: Article

Abstract

Dicalcium nitride (Ca2N) is a layered material that has been recently identified as a two-dimensional electride, based on first-principles calculations, where the electronic property and the optical complex dielectric function are studied using density functional theory. We find that the optical permittivity tensor is highly anisotropic, and Ca2N possesses metallic characters when the in-plane dielectric function is negative in midinfrared frequency. In addition, the enhanced midinfrared transmission property and the field distribution of one-dimensional photonic crystals composed of alternating Ca2N layers and the dielectric material are theoretically studied using the transfer-matrix method. It is found that the Ca2N photonic crystals support a series of passbands and stopbands the numbers of which increase with the thickness and the permittivity of the dielectrics. The field distributions show that the transmission resonances in the passband are attributed to the coupled Fabry-Pérot resonances of the individual reactively loaded dielectric slabs. It is also noticed that these resonances lie within certain characteristic frequency bands which are independent of the period of the photonic crystal. The low-frequency edge of the passband is highly tunable by the thickness of the electride material and the dielectric material, the permittivity of the dielectric layer, while the high-frequency edge is insensitive to the electride material thickness. Moreover, the first band gap in lower frequency is almost omnidirectional and polarization insensitive. When defect layers are introduced, the twin defect modes are found, and the frequency and the frequency interval of the two defect modes can be tuned just by changing the permittivity, the thickness and the position of the defect layer, respectively. Polarization and angular insensitive absorption bands can also be obtained for the electride-dielectric photonic crystal with a reflective substrate. These properties of electride material photonic crystals have potential applications in tunable multiband filters and absorbers in the midinfrared region.

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More information

e-pub ahead of print date: 28 August 2018
Published date: 28 August 2018

Identifiers

Local EPrints ID: 426588
URI: http://eprints.soton.ac.uk/id/eprint/426588
ISSN: 2469-9950
PURE UUID: bd1b2945-07db-4cc3-ac47-d0338759496f
ORCID for Jun Yu Ou: ORCID iD orcid.org/0000-0001-8028-6130

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Date deposited: 30 Nov 2018 17:30
Last modified: 16 Mar 2024 04:07

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Contributors

Author: Liwei Zhang
Author: Weiyang Yu
Author: Jun Yu Ou ORCID iD
Author: Qin Wang
Author: Xiaolin Cai
Author: Baoji Wang
Author: Xiaohua Li
Author: Ruiqi Zhao
Author: Yujin Liu

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