Jim A. Enriquez

Split Coaxial Cable Medium for Tunable Artificial Dielectrics and Plasmas

Alexander Zhuravlev, Jim A. Enriquez, Pavel A. Belov, Juan Domingo Baena

We introduce the Split Coaxial Cable Medium (SCCM), a mechanically tunable, capacitively loaded wire medium supporting artificial-dielectric and artificial-plasma Bloch regimes with high in-plane isotropy. Its unit cell comprises coaxial conductors interrupted by axial gaps. Relative axial displacement continuously varies their capacitive …

Design of ALPHA Phase I: A Plasma Haloscope for 10--20 GHz Post-Inflation Axions

ALPHA Collaboration, Xiran Bai, Rustam Balafendiev, Sean Barrett et autres

The axion is a well-motivated hypothetical particle capable of resolving both the strong CP problem and the dark matter mystery, with recent post-inflationary cosmological simulations favoring masses above 40 μeV. Plasma haloscopes serve as a promising experimental approach to reach theoretically preferred …

Single-shot near-field reconstruction of metamaterial dispersion

Eugene Koreshin, Denis Sakhno, Jim A. Enriquez, Pavel A. Belov

We present a single-shot near-field technique, where the near-field scan is performed on a single sample without repeating measurements or averaging over multiple samples, to reconstruct the isofrequency surfaces of metamaterials in the microwave regime. In our approach, we excite resonant modes …

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Single-shot near-field reconstruction of metamaterial dispersion

Eugene Koreshin, Denis Sakhno, Jim A. Enriquez, Pavel A. Belov

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Volume-preserving deformation of honeycomb wire media enables broad plasma-frequency tunability

Denis Sakhno, Jim A. Enriquez, Pavel A. Belov

Wire metamaterials are attractive for tunable resonators in dark-matter detection and electromagnetic technologies, but tuning the plasma frequency over a wide range remains challenging. This work employs a volume-preserving deformation of a honeycomb wire medium to realize over 60% plasma-frequency tuning, in …

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Sliding-Split-Strip Metamaterial with Tunable Dielectric and Plasmonic Properties

Jim A. Enriquez, Alexander Zhuravlev, Pavel A. Belov, Juan Domingo Baena

Most practical applications of metamaterials require tunable electromagnetic properties. Mechanical tuning, which involves moving elements of the unit cell, offers a promising approach, even in challenging conditions such as low temperatures or high magnetic fields needed for axion detection-a potential dark matter …

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Manipulating the Electromagnetic Field in Wire Media Resonators for Enhanced Axion Detection

Jim A. Enriquez, Pavel A. Belov

Microwave cavities have been proposed for detecting particles such as axions, a leading dark matter candidate. Key parameters influencing axion detection include the resonance quality factor, cavity volume, and form factor, which quantifies field homogeneity. We present a simple and effective method …

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Tunable Epsilon Near Zero Metamaterial with Rotating Obround-Shaped Meta-Atoms

Rustam Balafendiev, Gagandeep Kaur, Jim A. Enriquez, Gaganpreet Singh et autres

A new design of a microwave-range ENZ metamaterial consisting of rods with an obround cross-section is proposed. The plasma frequency of the metamaterial can be tuned by rotating the constituent meta-atoms. Tunability of the plasma frequency by 26% is demonstrated both experimentally …

Uniform field in microwave cavities through the use of effective magnetic walls

Jim A. Enriquez, Rustam Balafendiev, Alexander J. Millar, Constantin R. Simovski et autres

Wire medium (WM) resonators have emerged as a promising realization for plasma haloscopes---devices designed to detect axions, a potential component of dark matter. Key factors influencing the detection probability include cavity volume, resonance quality factor, and form factor. While the form factor …

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Uniform Field in Microwave Cavities Through the Use of Effective Magnetic Walls

Jim A. Enriquez, Rustam Balafendiev, Alexander J. Millar, Constantin R. Simovski et autres

Wire media (WM) resonators have emerged as promising realization for plasma haloscopes -- devices designed to detect axions, a potential component of dark matter. Key factors influencing the detection probability include cavity volume, resonance quality factor, and form factor. While the form …

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Dispersion characteristics of a glide-symmetric square-patch metamaterial with giant anisotropy

Jim A. Enriquez, Eugene Koreshin, J. P. del Risco, Pavel A. Belov et autres

This paper investigates the dispersion characteristics of a highly anisotropic metamaterial comprised of metal square patches arranged in a glide-symmetry pattern and submerged in a vacuum. Theoretical formulas are proposed to describe the electromagnetic tensors of a corresponding uniaxial effective medium with …

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Exploring Dispersion Characteristics of a Glide-Symmetric Square Patch Metamaterial

Jim A. Enriquez, Juan Domingo Baena, Pavel A. Belov

This work investigates the dispersion characteristics of an anisotropic metamaterial composed of glide-symmetric metal square patches in a vacuum background. We present theoretical formulas for calculating the metamaterial’s electromagnetic properties. The validity of the model is confirmed by comparing band diagrams and …

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