Strain-engineered widely tunable perfect absorption angle in black phosphorus from first principles

Mohammad Alidoust, Klaus Halterman, Douxing Pan, Morten Willatzen, Jaakko Akola

Research output: Contribution to journalJournal articleResearchpeer-review

31 Downloads (Pure)

Abstract

Using the density functional theory of electronic structure, we compute the anisotropic dielectric response of bulk black phosphorus subject to strain. Employing the obtained permittivity tensor, we solve Maxwell's equations and study the electromagnetic response of a layered structure comprising a film of black phosphorus stacked on a metallic substrate. Our results reveal that a small compressive or tensile strain, ≈4%, exerted either perpendicular or in the plane to the black phosphorus growth direction, efficiently controls the epsilon-near-zero response and allows perfect absorption tuning from low angle of the incident beam θ=0∘ to high values θ≈90∘ while switching the energy flow direction. Incorporating the spatially inhomogeneous strain model, we also find that for certain thicknesses of the black phosphorus, near-perfect absorption can be achieved through controlled variations of the in-plane strain. These findings can serve as guidelines for designing largely tunable perfect electromagnetic wave absorber devices.

Original languageEnglish
Article number115307
JournalPhysical Review B
Volume102
Issue number11
Number of pages14
ISSN2469-9950
DOIs
Publication statusPublished - Sep 2020

Fingerprint Dive into the research topics of 'Strain-engineered widely tunable perfect absorption angle in black phosphorus from first principles'. Together they form a unique fingerprint.

Cite this