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We report the first high-speed demonstration of a compact electroabsorption modulator based on epsilon-near-zero confinement in conducting oxide films. The non-resonant, 4μm-long device operates simultaneously over the entire C band through field-effect carrier density tuning.

We study the role of carrier mobility in transparent conducting oxides integrated into epsilon-near-zero modulators. High-mobility materials including CdO enable sub-micron length electroabsorption modulators through >4dB/µm extinction ratios.

We experimentally demonstrate the magnetic mirror behavior of all-dielectric metasurfaces at optical frequencies through phase measurements using time-domain-spectroscopy. The unique boundary conditions of magnetic mirrors can lead to advances in sensors, photodetectors and light sources.

Tellurium (Te) dielectric resonator metamaterials for thermal infrared applications were fabricated using a multi-cycle deposition-etch process that circumvents pinch-off issues during deposition. Deposition and etching of Te were studied in detail. Metamaterial samples with varying resonator dimensions were fabricated using this technique. All the samples showed two transmission minima corresponding to magnetic and electric dipole resonances. Longer resonant wavelengths were observed as the resonator dimension was increased. Observation of spectral overlap between magnetic and electric resonances gives us the potential opportunity to realize a negative refractive index material.

We directly demonstrate a dielectric optical magnetic mirror using phase-locked mid-infrared time-domain spectroscopy. This magnetic mirror is formed by micron-sized cubes of tellurium fabricated on a dielectric substrate.

The photoinduced dynamical reverse piezoelectric effect in epitaxial BiFeO3 thin films has been characterized by time-resolved hard X-ray diffraction measurements for ultrafast optical control of room temperature multiferroics.

We design and fabricate guided-mode resonant subwavelength gratings using an active layer of barium titanate. Loss mechanisms in the metal and in the guiding layer are investigated. Modeling and experimental results are shown.