Electromagnetic acoustic transducers (EMATs) have a behaviour that depends on the distance between transducer and surface of material under test, namely lift-off. Rayleigh waves generated by EMATs suffer from waveform distortion as lift-off is increased. This paper describes this numerically experimentally, focusing spatial distribution induced currents hence ultrasound pulses. verified experim...

The electromagnetic wave scattering from disordered nanostructured metal surfaces supporting surfaceplasmon polaritons ~SPP! is studied by means of fully retarded scattering formulations. We investigate the two physical mechanisms which may underlie the excitation of localized SPP: Anderson localization and shape resonances. The former mechanism is discarded since plane-wave excited, localized ...

Strong interests are recently emerging for development of solid-state devices operating in the so-called “terahertz gap” region for possible application in radio astronomy, industry and defense. To fill the THz gap by using conventional electron approach or transit time devices seems to be very difficult due to the limitation that comes from the carrier transit time where extremely small featur...

Surface plasmon polaritons (SPPs) manipulation is of vital importance to construct ultracompact integrated micro/nano-optical devices and systems. Here we report the design, fabrication, and characterization of a SPP microcavity with full transverse and longitudinal mode selection and control on the surface of gold film. The designed microcavity supports the fundamental and first-order transver...

We report critical coupling of electromagnetic waves to plasmonic cavity arrays fabricated on Moiré surfaces. Dark field plasmon microscopy imaging and polarization dependent spectroscopic reflection measurements reveal the critical coupling conditions of the cavities. The critical coupling conditions depend on the superperiod of the Moiré surface, which also defines the coupling between the ca...

Efficient and accurate modeling of electromagnetic structures is valuable in antenna analysis and design, and time domain solutions are at a premium over frequency domain in the case of ultra wide band signals or transients. Among the full wave electromagnetic methods in time domain the method of moments in time domain (MoM-TD) is very interesting. Such a method can be implemented, as for frequ...