We exploit the strong field enhancement offered by vertical gold nanocones resonating at 1 THz to induce THz field-driven electron emission. The nanocones are fabricated via an advanced 3D printing technique on a photopolymer and are successively gold coated. We demonstrate the clear advantage offered by nanocones featuring a monopolar resonance at THz frequencies with respect to traditional non-resonant tips via numerical modelling, THz far-field characterization, and the analysis of electron-induced argon gas fluorescence. Finally, we show that a further degree of optimization is enabled by tailoring the collective response of the nanocones when arranged in an array geometry.
Various electro-optic nonlinear organic crystals have been recently developed and successfully used as very efficient materials for the generation and detection of broadband terahertz (THz) waves due to their large second-order optical nonlinearities and excellent phase matching characteristics. In the present talk, some of newly developed highly nonlinear organic crystals, which can be applied for efficient ultra-broadband THz wave generation up to ~10 THz by near-infrared pumping, are introduced. Additionally, two approaches for suppressing phonon-mode absorption, leading to strong modulations of the THz spectra generated in most organic crystals, are discussed.
We have fabricated organic electro-optic single crystalline thin films on various inorganic substrates. A high
refractive index contrast of up to Δn = +0.6 at 1.55 μm with respect to glass substrates and up to Δn = -1.9
at 1.55 μm with respect to silicon substrates has been achieved. The single crystalline films can be grown
quasi-epitaxially without lattice matching and also on amorphous substrates providing appropriate interface
interactions and solid-liquid phase equilibrium conditions. The thickness of the single-crystalline films can vary
between less than 30 nm and above 5000 nm; they are therefore appropriate for optical waveguiding structures, as
well as nano-size electro-optic structures needed for future nanophotonics. Several organic electro-optic crystalline
materials have been employed using solution or melt-based processing. The techniques are suitable for the
fabrication of conventional wire electro-optic waveguides,
silicon-organic hybrid electro-optic waveguides, as well
as more complex organic-inorganic structures such as
single-crystalline electro-optic microring resonators.
We demonstrate electro-optic modulation in hybrid organic-crystal/silicon photonic waveguides. The organic
material is the newly developed organic crystal OH1 with very high electro-optic figures of merit, n3r = 530 pm/V
at 1319 nm, and the processing possibilities considerably improved compared to previous high-nonlinearity
organic crystals. We have developed an epitaxial-like solution growth of OH1 on various substrates and fabricated
electro-optic modulators with electro-optic functionality either directly in OH1 wire waveguides or in OH1 active
cladding of silicon wire waveguides. OH1-based waveguides offer a great potential for high-bandwidth, sub-1-V
half-wave voltage, hybrid organic/silicon electro-optic modulators with high electro-optic activity and stability.
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