In this paper, based on the theory of dynamic waveguiding effect in nanodisordered KTN crystals, a detailed design and implementation of a super broadband 1x2 high speed waveguide switch is presented. The important waveguide parameters, including the dimension, the refractive index distribution, and the electric field distribution within the waveguide are quantitatively simulated and analyzed. An experimental verification of switching effect based on the design is also conducted, which confirmed the design. The broadband and high speed nature of such kind of switch can play a key role in data center networks and cloud computing, which needs low power consumption and high speed switches.
In this paper, a nanosecond speed KTN beam deflector is presented. The beam deflector is based on the combination of pre-injected space charge field and high speed (nanosecond) switching field. A beam deflection speed on the order of nanosecond was demonstrated, which was fastest beam deflection speed reported so far. The experimentally results confirmed that the speed limitation of KTN beam deflector was not limited by the electro-optic (EO) effect itself but the driving electric source and circuit. With a faster speed driving source and circuit, it is possible to develop GHz frequency beam deflector.
In this paper, tunable spectrum LED based on nanostructured substrate is presented. In particular, the relationship between
the temperature distribution and the nanostructured substrate is quantitatively simulated. The simulation results suggest
that there can be a noticeable change in the temperature profile due to the existence of micro/nanostructured substrate.
Such a change in the temperature distribution can result in a change of indium composition of InGaN/GaN LED, which in
turn tune the output spectrum of LED.
A periodic parallel microgrooves on the silicon substrate with 2.5 um spacing covered by various nanostructures can be fabricated by using the interfered femtosecond laser illumination. The morphology created by this approach is apparently different from the common method using the femtosecond laser and sulfur hexafluoride (SF6). However, the treated silicon area could tremendously reduce the reflection from the surface. The reflectance of the structured surface is around 5% throughout the visible to near IR (1.1 um) despite of the viewing angle, which is comparative. Furthermore, the effect of the reflectance reduction is weaker but still obvious when wavelength is beyond 1.1 um, which is believed to be able to extend to the mid IR range.
The method by applying the interfered femtosecond laser to create nanostructured copper (Cu) surface has been studied.
The nanostructure created by direct laser irradiation is also realized for comparison. Results show that more uniform and
finer nanostructures with sphere shape and feature size around 100 nm can be induced by the interfered laser illumination
comparing with the direct laser illumination. This offers an alternative fabrication approach that the feature size and the
shape of the laser induced metallic nanostructures can be highly controlled, which can extremely improve its
performance in related application such as the colorized metal, catalyst, SERS substrate, and etc.
In recent years, much of effort has been devoted in the field of optical switches, including electro-optics (EO), magnetooptics
(MO), acousto-optics (AO), liquid crystal (LC), and microelectromechanical systems (MEMS). However, issues
which involve switching speed, aperture size, and extinction ratio cannot be simultaneously settled by the present
approaches. The paper proposes a novel optical switch based on tunable photonic metamaterial. By the controllable
external electrical or magnetic field, the nano-structure is forced to vary its optical properties to be an optical switch. The
theoretical studies suggest that the device could offer the merit features of ultra-fast speed, large aperture, and high
extinction ratio. In the future, we will not only thoroughly model the proposed devices, but investigate kinds of possible
fabrication process to implement the design. To be a next-generation optical switch, the tunable photonic metamaterial
has large potential in several civilian applications, including mobile high-speed display, free-space optical
communication, solar concentration, and the optical printing.
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