Emergent asymmetries and enhancement in the absorption of natural hyperbolic crystals

Wu, Xiaohu; McEleney, Cameron A.; González‐Jiménez, Mario; Macêdo, Rair

doi:10.1364/optica.6.001478

Cited by 36 publications

(21 citation statements)

References 36 publications

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“…This leads to spectral regions of highly asymmetric reflectance, as shown in Figure 2b. Although a rotation of the anisotropy has been demonstrated to generate asymmetric absorption 35 as well as new regions where maximum reflection is observed, 34 the reflectivity itself is always symmetric with respect to the incident angle for all frequencies if the incidence plane lies in the same plane as the anisotropy (β = 0). This is in stark contrast to what we see here when the plane of incidence is also rotated, as we can see a strong asymmetry at wavenumbers in the 540−560 cm −1 band.…”

Section: ■ Resultsmentioning

confidence: 99%

Asymmetric Reflection Induced in Reciprocal Hyperbolic Materials

McEleney

Shi

et al. 2022

ACS Photonics

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Reflection is one of the most fundamental properties of light propagation. The ability to engineer this property can be a powerful tool when constructing a variety of now ubiquitous optical and electronic devices, including one-way mirrors and antennas. Here, we show from both experimental and theoretical evidence that highly asymmetric reflection can be induced in reciprocal hyperbolic materials. This asymmetry stems from the asymmetric cross-polarization conversion between two linearly polarized waves, an intrinsic and more exotic property of hyperbolic media that is bereft of research. In addition to angle-controllable reflection, our findings suggest that optical devices could utilize the polarization of the incident beam, or even the polarization of the output wave, to engineer functionality; additionally, in hyperbolic slabs or films, the asymmetry can be tailored by controlling the thickness of the material. Such phenomena are key for directional-dependent optical and optoelectronic devices.

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Section: ■ Resultsmentioning

confidence: 99%

Asymmetric Reflection Induced in Reciprocal Hyperbolic Materials

McEleney

Shi

et al. 2022

ACS Photonics

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“…Over the past two decades, hyperbolic materials have attracted researchers' great interest due to their applications in optical absorbers, [1][2][3] optical mirrors, [4] and super-resolution imaging. [5][6] Recently, researchers discovered a kind of special phonon polaritons called hyperbolic phonon polaritons (HPPs) in hyperbolic materials.…”

Section: Introductionmentioning

confidence: 99%

Coupling Between Hyperbolic Phonon Polaritons Excited in Two Ultrathin Hexagonal Boron Nitride Sheets

Wu¹,

Su²,

Shi³

et al. 2022

Eng. Sci.

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Even though the hyperbolic phonon polaritons (HPPs) in hexagonal boron nitride (hBN) have been extensively studied, the HPPs in ultrathin hBN have not been fully considered and remain elusive. In this work, the HPPs in ultrathin hBN sheets are numerically studied. The dispersion relation and distribution of electric field are calculated to confirm the excitation of HPPs. Besides, the coupling effect between HPPs of two ultrathin hBN sheets are investigated. When the distance between two hBN sheets are smaller than the propagation length of the HPPs in the air, the HPPs can be strongly coupled. Therefore, the photon tunneling probability can be greatly enhanced. The splitting of the HPPs is similar to that of the surface waves, and such phenomenon is well explained in this work. The results show that the HPPs in ultrathin hyperbolic films share some characteristics with surface waves, and thus they should be clearly identified by investigating the dispersion relation and field profile. We believe that this work will deepen our understanding of the HPPs in ultrathin hyperbolic materials. In addition, the knowledge about the HPPs will help us understand the near-field radiative heat transfer between hyperbolic materials.

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“…In particular, they have the advantages over the hyperbolic metamaterials [3–5] such as their capability of carrying higher spatial frequency components and unnecessity of nanofabrication techniques. Due to their unique optical responses and advantages, they are applied for diverse applications, [6–14] including negative refraction, [15] sub‐wavelength imaging, [16] and waveguiding [17] . In a number of crystals, hyperbolic dispersions have already been theoretically and experimentally demonstrated: hexagonal boron nitride, [18,19] tetradymites, [20] and transition metal dichalcogenides, [2,21] to name a few.…”

Section: Introductionmentioning

confidence: 99%

The Two‐Dimensional Electrides XONa (X=Mg, Ca) as Novel Natural Hyperbolic Materials

Choe

Kim

2020

ChemPhysChem

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In two‐dimensional electrides, anionic electrons are spatially confined in interlayer regions with high density, comparable to metals, and they are highly mobile, just as free electrons, resembling hyperbolic metamaterials with metal‐dielectric multilayered structures. In this work, two‐dimensional electride materials MgONa and CaONa are proposed as good natural hyperbolic materials. By using the first‐principles calculations based on density functional theory (DFT), the electronic structures, stabilities, and optical properties of two‐dimensional electride materials XONa (X=Mg, Ca) are investigated. Our results show that they are stable in 1‐monolayer (1‐ML) structures as well as in bulk states. They exhibit hyperbolic dispersions from visible to near infrared spectral range with high qualities up to about 700, which is two orders‐of‐magnitude larger than the preceding bulk hyperbolic materials. Numerical results reveal that they exhibit negative refraction with low losses. Their high‐quality hyperbolic responses over a wide spectral range pave the way of broad photonic applications as natural hyperbolic materials.

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Emergent asymmetries and enhancement in the absorption of natural hyperbolic crystals

Cited by 36 publications

References 36 publications

Asymmetric Reflection Induced in Reciprocal Hyperbolic Materials

Asymmetric Reflection Induced in Reciprocal Hyperbolic Materials

Coupling Between Hyperbolic Phonon Polaritons Excited in Two Ultrathin Hexagonal Boron Nitride Sheets

The Two‐Dimensional Electrides XONa (X=Mg, Ca) as Novel Natural Hyperbolic Materials

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