Guided Surface Plasmon Mode of Semicircular Cross Section Silver Nanoridges

Tightly confined plasmon waveguide modes supported by semicircular cross section top silver nanoridges are investigated in this paper. Mode field profiles, dispersion curves, propagation distances, confinement factors, and figure-of-merits of semicircular top silver nanoridge plasmon waveguide mode are calculated for different radii of curvature at different wavelengths. It is found that semicircular top silver nanoridges support tightly confined quasi-TEM plasmon waveguide modes. Semicircular top silver nanoridge mode has longer propagation distance and higher figure-of-merit than that of the cylindrical silver nanowire of the same radius of curvature.Comment: 21 pages, 11 figure

Mode Properties of Flat-top Silver Nano-ridge Surface Plasmon Waveguides

We investigate surface plasmon modes supported by flat-top silver nano-ridges. We calculate the mode electromagnetic field distribution, the dispersion curve, the travel range, and the figure-of-merit of the nano-ridge mode. We find that the nano-ridge surface plasmon modes are quasi-TEM modes with longitudinal field components three orders of magnitude smaller than the transverse field components. The quasi-TEM nature of mode profiles reveals that the propagation of free electron oscillations on the top of the nano-ridge contributes mainly to the tightly confined ridge mode. We also find that as the width of the nano-ridge decreases, the ridge mode becomes more tightly confined on the ridge top. As the width of the nano-ridge increases, the nano-ridge mode approaches two decoupled right-angle wedge plasmon modes.Comment: 23 pages, 9 figures, journal articl

Small-signal modulation of multitransverse modes vertical-cavity surface-emitting semiconductor lasers

Abstract-The small-signal modulation response of multitransverse modes, proton-implanted vertical-cavity semiconductor lasers was studied experimentally and theoretically. Multiresonance frequencies and notches in the modulation response were obtained and the detailed characteristics varied for different overlap levels between the lasing modes. The theoretical modeling matched the experimental results and revealed the coupled oscillators manifestation for highly overlapping transverse modes

Limits of the modulation response of a single-mode proton implanted vcsel

Abstract-The limitations of the direct modulation bandwidth for proton implanted vertical-cavity lasers were explored. The measured damping factor of an optimized device, implies a possible bandwidth of up to 80 GHz. However, the intrinsic (parasitic free) carrier transport/capture time of 15 ps limits substantially the actual frequency response. The actual measured bandwidth-14.5 GHz was limited also by the emerging of higher lasing modes. The combined effects of shape, size and implantation dose should be optimized to reach the limit of the direct modulation of these lasers