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Two orthogonal-polarized pulse trains are simultaneously emitted from a single, all-polarization-maintaining fiber laser using two saturable absorber mirrors. This design shows great potential to reduce the complexity of current time-resolved measurement systems without sacrificing performance.
We present a highly accurate self-calibrating approach to investigate ceramic thermal barrier coatings on metallic substrates using terahertz (THz) technique in reflection geometry. The proposed approach enables the simultaneous determination of the complex refractive index and the coating thickness. Hence, a pre-calibration of the specimen under test is not required.
We present our work on the fabrication of three-dimensional Photonic Crystal templates by holographic lithography and direct laser writing. Both optical methods are highly qualified for the production of top-quality polymeric three-dimensional Photonic Crystals and allow in combination the controlled incorporation of defects and waveguides in large-area structures. Scanning electron micrographs and...
We present our work on the fabrication of three-dimensional Photonic Crystal templates by holographic lithography and direct laser writing. Both optical methods are highly qualified for the production of top-quality polymeric three-dimensional Photonic Crystals and allow in combination the controlled incorporation of defects and waveguides in large-area structures. Scanning electron micrographs and...
A new class of push–pull chromophore with an azomethine unit at a key position of the chromophore in order to increase the hyperpolarizability is reported. Additionally, a novel and convenient synthesis method is introduced which is particularly advantageous compared with known procedures because it offers high atom economy, the use of low cost reagents, and mild reaction conditions together with...
We present a novel numerical approach to decrease the limits of the minimum paint thickness measurements of individual layers in multilayered structures using terahertz pulsed technique in reflection geometry. This method combines the benefits of model-based material parameters extraction, a generalized transfer matrix method, and an evolutionary optimization algorithm. The proposed approach has been...
3D metallic nanostructures offer unique light-manipulation functionalities for nanophotonics, including isotropic magnetic optical response, dispersion manipulation, and engineering of the complex polarization state of light. Particularly, chiral metamaterials offer remarkable opportunities to manipulate the polarization properties of circularly polarized light, leading to pronounced optical activity...
Direct laser writing is a versatile technique for the fabrication of three-dimensional nano- and microstructures and has become recently commercially available [1]. Lateral feature sizes down to 100 nm are routinely achieved due to two-photon absorption and the threshold behaviour of the photoresists. The finite numerical aperture of the objective lens used in most systems (typically NA 1.4, oil immersion)...
Three-dimensional icosahedral dielectric photonic quasicrystals previously revealed highly structured transmittance spectra and unusual photon transport properties. Using a periodic approximant approach, we show that all these findings are consistent with multiple scattering of light.
We investigate the polarizing properties of chiral photonic metamaterials composed of three-dimensional metal helices. The calculated spectra reveal pronounced circular dichroism. Our geometry parameters are compatible with fabrication via direct laser writing and electrodeposition.
We present a planar magnetic metamaterial fabricated using 3D direct laser writing and silver chemical vapor deposition as well as a negative-index bi-anisotropic metamaterial metallized via silver shadow evaporation. Calculations and experiments show good agreement.
We fabricate planar magnetic photonic metamaterials via direct laser writing and silver chemical vapor deposition, an approach, which is also suitable for three-dimensional structures. Retrieval of the effective metamaterial parameters reveals the importance of bi-anisotropy.
We realize a variety of silicon photonic crystal structures. Direct laser writing of polymeric templates (square/circular spirals and slanted pore structures) combined with a silicon single-inversion procedure leads to band gaps in the near infrared.
We have fabricated and characterized polymeric three-dimensional layer-by-layer chiral photonic crystals. The obtained circular dichroism from polarization stop bands centered around 1.55 μm is comparable with that of recently demonstrated circular-spiral photonic crystals.
We have fabricated and characterized polymeric three-dimensional layer-by-layer chiral photonic crystals. The obtained circular dichroism from polarization stop bands centered around 1.55 mum is comparable with that of recently demonstrated circular-spiral photonic crystals.
We theoretically describe the optical properties of three-dimensional icosahedral photonic quasicrystals by means of a periodic approximant approach. Experimental findings that were previously ascribed to extrinsic effects are found to be intrinsic properties of quasicrystals.
We realize a variety of silicon photonic crystal structures. Direct laser writing of polymeric templates (square/circular spirals and slanted pore structures) combined with a silicon single-inversion procedure leads to band gaps in the near infrared.
We fabricate planar magnetic photonic metamaterials via direct laser writing and silver chemical vapor deposition, an approach, which is also suitable for three-dimensional structures. Retrieval of the effective metamaterial parameters reveals the importance of bi-anisotropy.
We present a novel high-index-of-refraction (2.45) photoresist material based on erbium doped arsenic trisulfide. It shows room temperature photoluminescence at 1.5 microns wavelength, and can directly be used for direct laser writing.
Periodic nanostructures in photonics facilitate a far-reaching control of light propagation and light–matter interaction. This article reviews the current status of this subject, including both recent progress and well-established results. The primary focus is on the basic physical principles and potential applications associated with the existence of Bragg scattering, photonic band structures, and...
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