We propose an integrated power divider/combiner at the interface between silicon nanowire and plasmonic slot waveguide (PSW). The proposed configuration facilitates light access and manipulation in planar nano-plasmonic circuits. The light is incident from a standard silicon nanowire to be accessed by a nano-plasmonic circuit providing subwavelength confinement. The structure overcomes the losses associated with long distance light propagation in nanoplasmonic splitters as coupling and splitting are performed at the same interface with minimal losses. Two PSWs placed orthogonally to the silicon nanowire forming hybrid junctions are exploited for the power dividing/combining functionality. The power splitter has been analyzed using the finite difference time domain (FDTD) numerical method. The ultra-compact proposed device provides wide-band power splitting functionality. A splitting of 34.7%, over most of the wavelength spectrum from 0.8 μm – 2.5 μm, is demonstrated.
Nanoplasmonic optical interconnects is proposed to mitigate challenges facing electronics integration. It provides fast
and miniaturized data channel that overcome the diffraction limit. We present a three dimensional plasmonic coupler that
vertically bends the light to multilevel circuit configurations. It exploits light guiding in nanoscale plasmonic slot
waveguides (PSWs). A triangularly-shaped plasmonic slot waveguide rotator is introduced to attain such coupling with
good efficiency over a wide bandwidth. Using this approach, light propagating in a horizontal direction is easily
converted and coupled to propagate in the vertical direction and vice versa. The proposed configuration is further
extended to the design of a multilayer power divider/combiner with ultra-compact footprint that guides the light to
multiple channels. A detailed study of the triangular rotator is demonstrated with the analysis of multiple configurations.
This structure is suitable for efficient coupling and splitting in multilevel nano circuit environment.
We propose a surface plasmon multilevel coupler based on the orthogonal junction coupling technique between silicon
nanowires and plasmonic slot waveguides (PSWs). It couples light of different polarizations from a silicon nanowire into multilevel plasmonic networks. Two orthogonal PSWs are employed to guide each polarization to its respective port. The proposed structure splits the polarizations and allows for simultaneous processing at different horizontal layers. Our
device overcomes inherent polarization limitation in plasmonic structures by providing multilevel optical signal processing. This ability of controlling polarization can be exploited to achieve 3-D multilevel plasmonic circuits and polarization controlled chip to chip channel. Our device is of a compact size and a wideband operation. The device
utilizes both quasi-TE and quasi-TM polarizations to allow for increased optical processing capability. The crosstalk is minimal between the two polarizations propagating in two different levels. We achieve -4.5 dB transmission efficiency at
a wavelength of 1.55 μm for the different polarizations in the respective ports. A transmission efficiency of -21 dB is
achieved in the subsidiary port. We analyze and simulate the structure using the FDTD method. The proposed device can
be utilized in integrated chips for optical signal processing and optical computations.
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