METAMATERIAL BASED OPTICAL DEVICES: DESIGN AND ANALYSIS

Abstract

Metamaterials possess distinctive and valuable characteristics that are not achievable in naturally occurring materials. This exceptional property of metamaterials contributes significantly to the advancements in various scientific and technological domains. This thesis delves into the author's extensive research on metamaterials, encompassing innovative application-specific designs and uses of existing metamaterial designs across a broad electromagnetic spectrum. The exploration spans from positive to negative refractive indices, including the zero-index region, revealing unprecedented properties in zero refractive index metamaterials (ZIMs). One significant aspect of this research involves the utilization of an all-dielectric metamaterial to create impeccable reflectors for both visible and infrared wavelengths. This is achieved by leveraging Electric Dipole (ED) and Magnetic Dipole (MD) resonance, which are essential for controlling light matter interactions at the nanoscale. Notably, the thesis highlights two key contributions to the field of zero-index metamaterials. The first is a triple-band application in the microwave C, X, and Ku bands using a zero-index metasurface. This innovative design offers potential solutions for enhancing performance in microwave communications and radar systems. The second contribution is a unique design featuring Quadrupole plasmon resonance for refractive index sensing applications. This design provides a highly sensitive method for detecting changes in the refractive index, which is crucial for various sensing technologies. The research covers diverse metamaterial types and domains, suggesting novel designs and applications with potential in optical and wireless communication, and sensing. These applications demonstrate the transformative impact that metamaterials can have on multiple industries. Additionally, the work explores optical metamaterials, specifically hybrid metal-dielectric metamaterials with wide bandwidth designed for applications in wireless and Wi-Fi communication. These hybrid metamaterials offer significant advantages in terms of performance and efficiency, showcasing the vast possibilities that metamaterials offer for future technological advancements. Overall, this thesis provides a comprehensive analysis of metamaterial-based optical devices, presenting new designs and insights that push the boundaries of what is possible with engineered materials. The findings and contributions presented in this work have the potential to drive innovation and pave the way for the development of next-generation technologies in various fields.