Single-mode guiding properties of subwavelength-diameter silica and silicon wire waveguides

Abstract

Single-mode optical wave guiding properties of silica and silicon subwavelength-diameter wires are studied with exact solutions of Maxwell's equations. Single mode conditions, modal fields, power distribution, group velocities and waveguide dispersions are studied. It shows that air-clad subwavelength-diameter wires have interesting properties such as tight-confinement ability, enhanced evanescent fields and large waveguide dispersions that are very promising for developing future microphotonic devices with subwavelength-width structures.

Supercontinuum generation and carrier envelope offset frequency measurement in a tapered single-mode fiber

“…According to previous analyses [19][20][21], the nonlinear coefficient largely depends on the fiber parameters, such as the core diameter, core-cladding index difference, and the effective core area of the transmission mode. When we only consider the fundamental mode transmission, the nonlinear coefficient is calculated to be about 53 W -1 km -1 at a wavelength of 1,030 nm.…”

Size dependence of elastic mechanical properties of nanocrystalline aluminum

“…[1][2][3][4] Of these forms, silica nanowires have a unique one-dimensional structure and properties with potential applications in nano-electromechanical systems, such as sensors and optical devices. [5][6][7] To facilitate the use of silica NWs in these devices, the mechanical properties and the associated phenomena which govern such nanostructures need to be well understood. Previous studies have utilized both experimental and theoretical approaches to investigate key mechanical and structural properties of amorphous silica NWs under tension and compression.…”

Graphene-doped polymer nanofibers for low-threshold nonlinear optical waveguiding

“…Figure 3b shows a normalized broadband transmittance of a typical 100-mm-long, 720-nm-diameter G/PVA nanofiber. Transmittance at the long-wavelength side (.1200 nm) seems higher Graphene-doped polymer nanofibers C Meng et al 2 than the rest, which can be explained by lower fractional power confined in the fiber at longer wavelengths 20 .…”

“…At an average power below 10 mW, the nanofiber shows linear transmittance of approximately 10% at all three wavelengths; when the power was increased to ,10-20 mW, transmittance started to increase with increasing power due to saturated absorption. Because the optical field is better confined in a nanofiber at shorter wavelengths 20 36 .…”

“…Optical waveguides are particularly attractive due to their significantly enhanced interaction length, compact size, and high integrability, but hybridizing graphene film with a micro/nanowaveguide involves elaborate and complicated transferring processes 13,19 that are time-consuming and difficult to adapt to waveguides on a subwavelength scale. Furthermore, although field intensity inside the waveguide is much stronger than outside 20 , graphene film usually has to be pasted outside the waveguide 13,17,19 . Recently, polymer optical nanofibers have been demonstrated to be excellent hosts for a number of functional dopants such as dye molecules 21 , quantum dots 22 , and gold nanorods 23 , and have shown great promise in nanophotonics with great versatility and high compactness [24][25][26][27][28] .…”