2,296 research outputs found
Mid-IR heterogeneous silicon photonics
In this paper we discuss silicon-based photonic integrated circuit technology for applications beyond the telecommunication wavelength range. Silicon-on-insulator and germanium-on-silicon passive waveguide circuits are described, as well as the integration of III-V semiconductors, IV-VI colloidal nanoparticle films and GeSn alloys on these circuits for increasing the functionality. The strong nonlinearity of silicon combined with the low nonlinear absorption in the mid-infrared is exploited to generate picosecond pulse based supercontinuum sources and optical parametric oscillators that can be used as spectroscopic sensor sources
III-V-on-silicon photonic devices for optical communication and sensing
In the paper, we review our work on heterogeneous III-V-on-silicon photonic components and circuits for applications in optical communication and sensing. We elaborate on the integration strategy and describe a broad range of devices realized on this platform covering a wavelength range from 850 nm to 3.85 μm
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
On-chip optical diode based on silicon photonic crystal heterojunctions
Optical isolation is a long pursued object with fundamental difficulty in
integrated photonics. As a step towards this goal, we demonstrate the design,
fabrication, and characterization of on-chip wavelength-scale optical diodes
that are made from the heterojunction between two different silicon
two-dimensional square-lattice photonic crystal slabs with directional bandgap
mismatch and different mode transitions. The measured transmission spectra show
considerable unidirectional transmission behavior, in good agreement with
numerical simulations. The experimental realization of on-chip optical diodes
using all-dielectric, passive, and linear silicon photonic crystal structures
may help to construct on-chip optical logical devices without nonlinearity or
magnetism, and would open up a road towards photonic computers.Comment: 14 pages, 5 figure
- …