Bridging the gap between ultrashort pulsed optical waves and terahertz (THz) waves, the THz photoconductive antenna (PCA) is a major constituent for the emission or detection of THz waves by diverse optical and electrical methods. However, THz PCA still lacks employment of advanced breakthrough technologies for high-power THz emission. Here, we report the enhancement of THz emission power by in...

We show that the coherent interaction between microcavity polaritons and externally stimulated acoustic phonons forms a tunable polariton superlattice with a folded energy dispersion determined by the phonon population and wavelength. Under high phonon concentration, the strong confinement of the optical and excitonic polariton components in the phonon potential creates weakly coupled polariton...

We present a combined theoretical and experimental study of the anisotropy in the optical absorption of V-shaped quantum wires. By means of realistic band structure calculations for these structures, we show that detailed information on the heavy-and light-hole states can be singled out from the anisotropy spectra independently of the electron confinement, thus allowing accurate valence band sp...

We propose a semiconductor microcavity structure in which the cavity layer is entirely both optically and electronically active. Optical spectra at normal incidence are studied theoretically, showing the drastic effects of the cavity polariton mode splitting and of the Bragg mirror confinement.

We propose a metamaterial approach to route terahertz waves that features subwavelength confinement in the transverse plane. The guiding mechanism is based on geometrically induced electromagnetic modes sustained by corrugated metallic wedges, whose characteristics resemble those of wedge plasmon polaritons at telecom and optical frequencies. Additionally, frequency selective focusing and slowi...

The strength and ductility of concrete improve under multi-axial compressive stress due to confinement effect. Some parameters are effective for considering the confinement in concrete and various stress-strain models were developed by different researchers. Longitudinal and transverse reinforcement steels can influence on confinement in reinforced concrete members. In this paper, various stres...

The feedback control to optical tweezers is an obvious approach improve the confinement. However, electronic-based controlling system in usually consists of complex software and hardware, its performance limited by inevitable noise time-delay from detecting devices. Here, we present demonstrate dual-beam intracavity enabling all-optical independent radial axial self-feedback trapped particle’s ...