A bi-material cantilever based surface plasmon modulation structure is proposed. It is shown that the mechanical actuation of bi-material cantilever by changing temperature can facilitate amplitude modulation. More specific, the issues of scaling-down and integration of the red, green, and blue are discussed. This work can be expanded to the complex modulation structure which is already demonstrated in our previous work. The optimization would be fit for the integration of the red, green, and blue complex modulation structures which can potentially lead to the development of full-color complex spatial light modulator.
We present a novel method for converting channel plasmon polariton (CPP) waves in a waveguide into free-space optical waves. A grating decoupler in the CPP waveguide is designed by using grating equation. The CPP interacts with the grating decoupler and is re-radiated into the air. The effective index in the grating equation can be obtained by examining the dispersion characteristics of CPPs. In addition, a design strategy for efficient out-coupling is discussed. This works are believed to offer appropriate functionality for lab-on-a-chip sensing applications.
The singular points of time-averaged power flow in electromagnetic fields can be qualitative parameters to understand
the behavior of energy flow of electromagnetic systems. Rough relations between the power transmission efficiency or
field enhancement and the behavior of the singular points are discussed. In this study, we investigate the relation between
the singular points in power flow and other physical characteristics such as the field enhancement or power transmission
efficiencies. By investigating the power flows near isolated or periodic slits and antennas, we hope to provide another
view of understanding the physics in those structures.
A device converting cylindrical waves to plane waves is demonstrated. This device is comprised of two Luneburg lenses and Bragg gratings. The two Luneburg lenses are placed in contact with each other and Bragg grating is placed perpendicular to the longitudinal axis of the lenses. The function of the Luneburg lens is to convert cylindrical waves to plane waves and vice versa. The function of the Bragg grating is to reflect the plane waves. If we put the cylindrical wave source on the contact point of the lenses, short range plane waves are generated. We verified them by using the FEM simulations. Efficiency of the device is also analyzed depending on wavelength and dimension of the lens.
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