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Open research questions in Metamaterials and Metasurfaces Applications

47 unresolved questions extracted from the limitations and future-work sections of 299 Metamaterials and Metasurfaces Applications papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • The study is limited to the understanding of the cavity-like modes of the silver nanowire-alumina two-dimensional HMM. The experimental measurements are limited to the characterization of the fabricated HMM sample and the coupling of the HMM to quantum emitters.

    Unraveling cavity-like modes of two-dimensional broad band hyperbolic metamaterial and their coupling to quantum emitters · 2026 · DOI

  • Further studies are needed to understand the cavity-like modes of the HMM and their relevance in light propagation and the coupling of the HMM to quantum emitters. The use of HMM in strong light-matter interactions needs to be explored further.

    Unraveling cavity-like modes of two-dimensional broad band hyperbolic metamaterial and their coupling to quantum emitters · 2026 · DOI

  • Investigating the scalability of the NIL process for large-area metasurface fabrication. Exploring the use of Ta2O5 PER for creating metasurfaces with complex architectures.

    Extending the boundaries of ultraviolet-visible meta-optics via direct imprinting of tantalum pentoxide composite · 2026 · DOI

  • Realizing scalable UV-visible broadband metasurfaces remains challenging due to fabrication limitations. Conventional UV and visible metasurface materials face a compromise between refractive index and extinction coefficient.

    Extending the boundaries of ultraviolet-visible meta-optics via direct imprinting of tantalum pentoxide composite · 2026 · DOI

  • The need for complex waveguide designs that could allow a high level of control of the electromagnetic field.

    Power flux in a three-layer slab waveguide with graphene interfaces and a metamaterial core · 2026 · DOI

  • Metamaterial can be viewed as composite materials. Subsequently, the effective permittivity εeff can be determined. This framework includes theories such as: temporal and spatial factor, homogenization theory, Maxwell–Garnett theory, Lord-Rayleigh approximation, and Bruggeman mixing equations. enhancement electric-field 4.1.1.1 Theoretical formulation For metamaterials composed of two different materials, the dielectric constants of the two materials are ε1 and ε2, and their proportions are f2 = 1 − f, respectively. We can derive the equivalent dielectric constant (derivations are provided in Supplementary Material 8): f1 = f and εeff = f1ε1A + f2ε2 f1A + f2 (4.1.1) Here, A is Electric Field Enhancement Factor, which is defined as the ratio of the electric field strength of the medium. When A = 1, the original effective medium theory is obtained: εeff = f1ε1 + f2ε2 f1 + f2 (4.1.2), the equivalent dielectric constant described by When A = 3ε2 ε1+2ε2 the Maxwell–Garnett model is derived as [125, 126]. εeff = ε2 + 3 f (ε1 − ε2) ε1 + 2ε2 − f (ε1 − ε2) (4.1.3) By adding higher-order terms of f, we obtain the following expression of the Lord–Rayleigh model: εeff = ε2 + 3 f (ε1 − ε2) ε1 + 2ε2 − f (ε1 − ε2) + α2 f2 + α3 f3 + ⋅ ⋅ ⋅ (4.1.4) Here, αn(n = 2, 3, …) denotes the higher-order coefficients associated with higher-order mixing terms. If the two materials have the same proportion, according to self-consistent Bruggeman theory, the Bruggeman Mixing Equation is adopted: f1 ε1 − εeff ε1 + 2εeff + f2 ε2 − εeff ε2 + 2εeff = 0 (4.1.5) 4.1.1.2 Assumptions and limitations This section treats the composite material formed by two pure components and determines the effective permittivity based on the filling fraction. The starting point and objective of this theory are complete; however, each equation in the derivation introduces its own assumptions, which restrict its applicability. Equations 4.1.1–4.1.4 are the general forms suitable for arbitrary cases. However, the former contains an undetermined parameter A, whereas the latter involves αn. Both methods require experimental determination or additional assumptions. From another viewpoint, the latter can be regarded as a higher-order expansion of the former with respect to f. Assuming that the interaction between the two materials is negligible, A = 1, yielding Equation 4.1.2. Such an assumption holds only when the wavelength of the electromagnetic wave and the characteristic scale differ significantly. when the wavelength is much larger than the structural scale, scale related effects can be ignored, and when the characteristic scale is large, the composite can be treated as consisting of two independent constituents.

    Theories on classical electromagnetic metamaterials · 2026 · DOI

  • Implementation of time-varying manipulation of illusion displacement, curvature, tilt angle, and splitting behavior through sequence-programmable or scenario-adaptive EM illusions via column-wise grouping and independent tuning of active elements.

    Inverse-synthetic-aperture-radar imaging-driven customized polarization-programmable meta-illusions enabled by spin-multiplexed single-layer metasurfaces · 2026 · DOI

  • Integration of active or tunable components such as PIN diodes, varactor diodes, or voltage-controlled reactive elements into the proposed BLPS meta-atoms to enable dynamic control of illusion characteristics.

    Inverse-synthetic-aperture-radar imaging-driven customized polarization-programmable meta-illusions enabled by spin-multiplexed single-layer metasurfaces · 2026 · DOI

  • The challenges of alignment and associated stability in multi-element bulk-optical systems. The need for a compact and integrated system for quantum phase gradient imaging. The limitation of resolving only a specific range of phase gradients.

    Quantum phase gradient imaging using a nonlocal metasurface system · 2026 · DOI

  • The resolution is primarily limited by the fabricated metasurface dimensions. The system can accurately resolve only a specific range of phase gradients.

    Quantum phase gradient imaging using a nonlocal metasurface system · 2026 · DOI

  • Conventional chiro-optical techniques have limitations, such as their inability to probe spatially and angularly inhomogeneous chirality. There is a need for a comprehensive characterization of intrinsic chiro-optical behavior. The gap is addressed by the Fourier-domain Mueller matrix approach presented in this paper.

    Decoding chirality at the nanoscale with momentum-space polarimetry · 2026 · DOI

  • The proposed design is limited to the terahertz frequency range. The fabrication complexity of the proposed design may be a limitation. The absorption performance of the proposed design may be affected by the quality of the graphene material.

    Tunable broadband perfect absorber based on Graphene · 2026 · DOI

  • Current electromagnetic wave absorbers have limitations in terms of tunability and fabrication complexity. There is a need for a novel design that can offer high tunability and fabrication simplicity. The terahertz frequency range is of particular interest due to its potential applications.

    Tunable broadband perfect absorber based on Graphene · 2026 · DOI

  • The study suggests further research on the optimization of the geometric parameters for better performance. The study suggests further research on the application of the proposed structure for THz sensing applications.

    Numerical and circuit model analysis of a polarization-independent symmetric metamaterial exhibiting EIT for THz sensing applications · 2026 · DOI

  • The study identifies the need for a symmetric and polarization-insensitive metamaterial structure in the terahertz region. The study identifies the need for a structure that can exhibit the EIT-like effect at room temperature.

    Numerical and circuit model analysis of a polarization-independent symmetric metamaterial exhibiting EIT for THz sensing applications · 2026 · DOI

  • Investigation of the long-term stability of the metasurfaces. Development of metasurfaces for detection of other types of skin cancer. Exploration of the potential of metasurfaces for other biomedical applications.

    Flexible graphene-based metasurfaces for ultra-sensitive detection of basal cell carcinoma · 2026 · DOI

  • Traditional THz systems have limitations in sensitivity and spatial resolution. There is a need for high-resolution, non-invasive THz sensing and early skin cancer diagnosis.

    Flexible graphene-based metasurfaces for ultra-sensitive detection of basal cell carcinoma · 2026 · DOI

  • Experimental verification of the numerical modeling results. Exploration of new mechanisms for optical carrier generation in semiconductors. Analysis of the effects of different stochastic plasmonic structures on semiconductor photocatalysis.

    Consideration of stochastic plasmonic structures for the enhancement of semiconductor photocatalysis: from nanoparticles to metasurfaces · 2026 · DOI

  • The lack of understanding of the mechanisms for optical carrier generation in semiconductors. The need for more efficient photovoltaic devices. The potential for stochastic plasmonic structures to enhance semiconductor photocatalysis.

    Consideration of stochastic plasmonic structures for the enhancement of semiconductor photocatalysis: from nanoparticles to metasurfaces · 2026 · DOI

  • Material losses can limit the performance of the excitonic hyperbolic metamaterial. The need for improved alignment of the nanotubes is noted as a potential area for future improvement.

    Electrically Tunable Excitonic-Hyperbolicity in Chirality-Pure Carbon Nanotubes · 2026 · DOI

  • Improving the alignment of the nanotubes to mitigate material losses. Exploring the use of excitonic carbon nanotubes for various applications, such as adaptive optical devices and electrically controlled spontaneous emission.

    Electrically Tunable Excitonic-Hyperbolicity in Chirality-Pure Carbon Nanotubes · 2026 · DOI

  • The paper does not discuss the scalability of the metadevice fabrication process. The device operation is limited to a specific range of wavelengths. The paper does not provide a detailed analysis of the device's power consumption and stability.

    Interactively addressable organic metadevices · 2026 · DOI

  • Increasing the pixel density through optimized nanoantenna design and higher-resolution electrode routing could enable more complex and high-fidelity holographic content. The platform can be further developed to support more advanced functionalities, including multi-color display and higher-resolution imaging.

    Interactively addressable organic metadevices · 2026 · DOI

  • The design of metamaterials is a complex task that involves designing meta-atoms and their distributions in space. Current generative models have not yet been effectively applied to macroscopic artificial materials.

    Generative model for information metamaterial design · 2026 · DOI

  • Transferring the proposed strategy to other electromagnetic regimes. Exploring the application of the metasurface in various fields such as information transmission, sensing, and computation.

    Sliding metasurface for wide-angle beam steering with sharp frequency filtering · 2026 · DOI

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47 open questions have been extracted from the limitations and future-work passages of 299 Metamaterials and Metasurfaces Applications papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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