3,923 research outputs found
Ultra-compact modulators based on novel CMOS-compatible plasmonic materials
We propose several planar layouts of ultra-compact plasmonic waveguide
modulators that utilize alternative CMOS-compatible materials. The modulation
is efficiently achieved by tuning the carrier concentration in a transparent
conducting oxide layer, thereby tuning the waveguide either in plasmonic
resonance or off-resonance. Resonance significantly increases the absorption
coefficient of the plasmonic waveguide, which enables larger modulation depth.
We show that an extinction ratio of 86 dB/um can be achieved, allowing for a
3-dB modulation depth in less than one micron at the telecommunication
wavelength. Our multilayer structures can potentially be integrated with
existing plasmonic and photonic waveguides as well as novel semiconductor-based
hybrid photonic/electronic circuits
Ultra-compact branchless plasmonic interferometers
Miniaturization of functional optical devices and circuits is a key
prerequisite for a myriad of applications ranging from biosensing to quantum
information processing. This development has considerably been spurred by rapid
developments within plasmonics exploiting its unprecedented ability to squeeze
light into subwavelength scale. In this study, we investigate on-chip plasmonic
systems allowing for synchronous excitation of multiple inputs and examine the
interference between two adjacent excited channels. We present a branchless
interferometer consisting of two parallel plasmonic waveguides that can be
either selectively or coherently excited via ultra-compact antenna couplers.
The total coupling efficiency is quantitatively characterized in a systematic
manner and shown to exceed 15% for small waveguide separations, with the power
distribution between the two waveguides being efficiently and dynamically
shaped by adjusting the incident beam position. The presented design principle
can readily be extended to other configurations, giving new perspectives for
highly dense integrated plasmonic circuitry, optoelectronic devices, and
sensing applications.Comment: 15 pages, 6 figure
Advances in small lasers
M.T.H was supported by an Australian Research council Future Fellowship research grant for this work. M.C.G. is grateful to the Scottish Funding Council (via SUPA) for financial support.Small lasers have dimensions or modes sizes close to or smaller than the wavelength of emitted light. In recent years there has been significant progress towards reducing the size and improving the characteristics of these devices. This work has been led primarily by the innovative use of new materials and cavity designs. This Review summarizes some of the latest developments, particularly in metallic and plasmonic lasers, improvements in small dielectric lasers, and the emerging area of small bio-compatible or bio-derived lasers. We examine the different approaches employed to reduce size and how they result in significant differences in the final device, particularly between metal- and dielectric-cavity lasers. We also present potential applications for the various forms of small lasers, and indicate where further developments are required.PostprintPeer reviewe
Numerical Modeling of a Teeth-shaped Nano-plasmonic Waveguide Filter
In this paper, tooth-shaped and multiple-teeth-shaped plasmonic filters in
the metal-insulator-metal (MIM) waveguides are demonstrated numerically. By
introducing a three-port waveguide splitter, a modified model based on the
multiple-beam-interference and the scattering matrix is given. The ransmittance
spectrum as a function of teeth width, depth, period and period number are
respectively addressed. The result shows the new structure not only performs
the filtering function as well as MIM grating-like structures, but also is of
submicrometer size for ultra-high integration and relatively easy fabrication.Comment: 21pages, 7 figure
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