Future Prospective

This research presented in this thesis has revealed a number of results that can be potentially applied to future nanophotonic devices. Much of the efforts of this thesis focused on the engineering of material and nanostructures for the engineering of light- matter interaction to enhance LODS or absorption rate. In Chapter 6, we investigate the light emission of silicon quantum dots on TiN-based hyperbolic metamaterial (HMM). This device requires spinning coating of an active layer of quantum dots, which means the light emission is from the top of the device. Based on the findings of this thesis, an active hyperbolic metamaterial (HMM) of ITO/Er:ZnO has been proposed to potentially enhance light emission at 1.55 µm and nonlinearity in the visible spectrum. The effective permittivity of this HMM is shown in Figure 6.8 of Chapter 6.

Additionally, my colleague Ren Wang has demonstrated wide and controllable wavelength tunability of anapole-driven absorption enhancement in nanodisks. By systematically studying the effects of width D and height H of the nanostructures on the absorption enhancement spectra, we can achieve the excitation of anapole modes with optimal absorption enhancement [146].

As shown in Chapter 9, we have demonstrated tunable anapole mode excitation due to the destructive interference of electric and toroidal dipole moment. The next logical step of research is to study the absorption spectra of the fabricated silicon nanodisks. The engineering of the silicon nanostructures could be extended to other high index materials and geometries, which eventually allows the broadband absorption rate enhancement in the visible and near-infrared spectra.

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