Devices and methods for light control in material composites
A technology of dielectric materials and gratings, used in optical components, instruments, optics, etc.
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Embodiment 1
[0194] In this embodiment, the optical and electromagnetic properties of layered gratings like the present invention are simulated using coupled-mode algorithms using surface impedance boundary condition (SIBC) approximations. This method is described in detail in "Numerical Modeling and Electromagnetic Resonant Modes in Complex Grating Structures and Optoelectronic Device Applications" by D. Crouse, IEEE Trans. Electron Devices 52:2365-2373 (2005), which is hereby incorporated by reference in its entirety, and Only outlined here. refer to Figure 24 , the method uses the following approximations related to the tangential components of the electric and magnetic fields at the dielectric / metal interface:
[0195] E | | = Z n ^ × H | | - - - (...
Embodiment 2
[0233] refer to Figure 5C and Image 6 , an embodiment of the per-period single-groove grating structure 58 is fabricated to enhance the transmission of TE polarized and TM polarized microwaves at a predetermined frequency of 25.188 GHz (wavelength λ=11.91 mm). The grating structure has an A1 contact or wire (ε A1 =-10 4 +i·10 7 ), period 10.3428mm, trench width 3.8211mm, thickness 6.045mm, trench dielectric constant 2.8, and base and top cover are air. Experimental results for this simple grating structure confirm the accuracy of the numerical simulation algorithms presented in this paper and the principles of CM-induced enhanced transmission, thus allowing the same use of these algorithms and principles for more complex structures with more than one groove per period. In the design of complex grating structures, for example, as Figure 22 shown.
[0234] Two numerical simulation methods were employed and their results compared to ensure consistency and accuracy. One ...
Embodiment 3
[0239] It is known that phase resonance for TM polarized incident light can occur in gratings with multiple grooves per period, differing in composition, geometry or orientation of the grooves. In these types of structures, TM-polarized VSP-CMs in adjacent trenches couple, producing field distributions of the same magnitude but with a π-radian phase difference; such modes are called π-modes or resonances, e.g., like the Alastair P As described by Hibbins et al. in Physics Review Letters 96 257402 (2006). However, light recycling for arbitrary polarization has not been previously reported.
[0240] For TE polarized light, there is no electric field component perpendicular to any metal / dielectric interface, so the SP and VSP-CM will not be excited. However, applicants have discovered that WG-CMs generate, accompanied by Rayleigh anomalies, resulting in a number of enhanced or anomalous optical effects, including TE polarized π-modes with characteristics similar to those of TM-p...
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