Search

We extend the operation bandwidth of substrateless all-silicon waveguides beyond the single-mode region. This requires a suitably broadband port-access scheme, as well as careful management of undesired higher order modes. It is found that a length of two-conductor waveguide serves both purposes. In this way, we experimentally demonstrate broadband power transfer between dielectric waveguides and numerically investigate suppression of higher order modes. This 3-D solid-metal two-conductor waveguide shows promise as a package-external terahertz port, to address the 40% relative-bandwidth bottleneck that is currently imposed by hollow metallic waveguides. This represents a step toward efficient handheld terahertz systems that fully exploit the broad available spectrum.

A technique capable of characterizing the spectral parameters of gold nanostructures is demonstrated. These properties are providing numerous advances in the field of high sensitive diagnostics, drug delivery and optical therapeutic applications. To obtain spectroscopic measurements of gold nanorods within a turbid media that mimics soft tissue, this work presents the potential of the photon to ultrasound conversion, by means of real-time Laser Optoacoustic Spectroscopy (LOS), The obtained results are shown for the complete wavelength range of 410 to 1000 nm that followed by a comprehensive comparative analysis with achieved results of parallel reference measurement schemeand standard spectrophotometry.