Dissertations and Theses
Date of Award
2023
Document Type
Dissertation
Department
Engineering
First Advisor
Alexander Khanikaev
Keywords
topological photonics, metamaterials, nanofabrication, spectroscopy
Abstract
High-resolution nanopatterning techniques, such as electron beam lithography, extended opportunities for implementation of the various designs of photonic structures which exhibit exciting physical phenomena in the optical domain. A straightforward fabrication of on-slab nanostructures is advantageous for integration with various photonic on-chip devices. Last decade all-dielectric periodic nanostructures (photonic metasurfaces) boost a growth of novel optical technologies, from ultra-sensitive detectors to compact beam structured lasers. Moreover, they represent one of the most promising platforms in which topological phases can be explored and exploited.
Topological photonic structures attract a significant interest owing to their outstanding properties such as a resilience to defects and disorders. Topological insulators with engineered photonic pseudo-spins paves a path to enormous control on propagation and radiative properties of electromagnetic waves on chip. Even more degrees of freedom may be achieved by combining photonic topological properties with excitations of condensed matter systems, like van der Waals or 2D materials. In this dissertation results for design, fabrication and experimental investigation of photonic spin-Hall topological metasurfaces and their integration with 2D materials are demonstrated.
In our works we used metasurfaces which represent a slab of material with a high refractive index (e.g., silicon) patterned with the use of electron beam lithography. For one of the most v common designs of symmetry protected topological photonic metasurfaces – spin-Hall and valley- Hall structures – we demonstrated that a slowly varied interface between trivial and topological domains can host gapless topologically protected edge states with a longer propagation length in comparison with edge states of abrupt interface. Moreover, in this dissertation we show that adiabatic variation of the interface profile reveals an access to spin-full guided modes which radiative properties controlled by photonic pseudo-spin. These discovered modes can offer a new direction for pseudospin-dependent trapping and guiding of light.
We were able to fabricate topological photonic structures which can operate in visible, near- infrared and mid-infrared regions. This spectral flexibility of photonic metasurfaces design extends its application range to investigation of even more fascinating structures integrated with different 2D materials. In this dissertation we demonstrate hybrid polaritonic states occurring when electromagnetic fields in our photonic topological systems strongly coupled with excitons in visible range and with phonons in mid-infrared range.
Recommended Citation
Kiriushechkina, Svetlana, "Topological photonic metasurfaces for light manipulation and strong light-matter interaction" (2023). CUNY Academic Works.
https://academicworks.cuny.edu/cc_etds_theses/1126