Posters

Anagha K V, Prof. Anshuman Kumar Group, IIT Bombay

Title: Orbital Angular Momentum Encoded Photons from hBN Quantum Emitters Coupled to Hybrid Metasurfaces

Abstract: We demonstrate on-chip generation of single photons carrying spin and orbital angular momentum using hBN quantum emitters coupled to a dielectric-plasmonic metasurface, producing vortex beams with controlled topological charges and high-purity chiral emission for quantum photonic applications.

Ekta, Prof. Anshuman Kumar Group, IIT Bombay

Title: Quantum Spin Hall Photonic Architecture in the Visible Region

Abstract: We present a theoretical design of a Quantum Spin Hall photonic structure operating in the visible wavelength regime. The architecture is based on deformed hexagonal lattices with preserved six-fold symmetry to realize photonic topological insulators supporting spin-dependent edge states. Through band structure calculations, we demonstrate topological band inversion and the emergence of helical edge modes that can robustly guide circularly polarized light. This design enables unidirectional, backscattering-immune light transport even through sharp bends, making it highly promising for compact, low-loss photonic circuits. The proposed platform offers potential for coupling to excitonic systems and integrated quantum photonics in the visible spectrum.

Hrushikesh, Prof. Anshuman Kumar Group, IIT Bombay

Title: Sensing with Broken Symmetry: Revisiting Bound States in the Continuum

Abstract: Single-photon sources play a pivotal role in advancing quantum communication and photonic computing technologies. Achieving efficient emission and extraction of photons from such sources is essential for their practical implementation. Here, we present an inverse design strategy aimed at maximizing the emission intensity of single photons. The optimization process is guided by three key factors: collection efficiency, Purcell enhancement, and absorption. By systematically balancing these parameters, the proposed framework offers a pathway toward highly efficient single-photon sources tailored for next-generation quantum photonic applications.

Yadav Rohit Umashankar, Prof. Parinda Vasa Group, IIT Bombay

Title: Photobleaching Suppression through Strong Light-Matter Interactions between Molecular Excitons of Cyanine Dye Jaggregates and Propagating Surface Plasmons

Abstract: Here, we experimentally investigate the suppression of photobleaching of cyanine dye j-aggregates when it is strongly coupled to propagating surface plasmons on planar silver film. The experimental technique involves the novelty of probing only the strongly coupled molecules for bleaching suppression in the Kretschmann configuration with no background from uncoupled molecules.

Dreamsy Manchanda, Prof. Parinda Vasa Group, IIT Bombay

Title: Investigating strong coupling in prominent light trapping Ag nanocomposites

Abstract: We envisioned a multi-layered hybrid system with an architecture: Ag-islands/TiO2/Ag film whose light captivating abilities go beyond the LSPR resonance of Ag islands. The LSPR of Ag islands concentrates and amplifies the incident electric field and electron accepting levels of TiO2 extract this energy in the form of electronic transitions. The hot electron transfer from Ag-islands to TiO2 is further enhanced because TiO2 forms a cavity between the two reflecting Ag surfaces. The strong coupling between the LSPR modes of silver islands and the plasmonic cavity results in splitting of plasmonic absorption band. The formation of two hybrid modes makes the system responsive over a broad range of wavelengths. We optimized our multi-layered hybrid system for a much stronger light confinement over the entire visible regime of 450-700 nm.

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