Theoretical investigation of optical forces in the dipole regime with continuous microstructured beams based on Bessel modes

• Grant number: 24/15208-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: November 01, 2024
• End date: October 31, 2025
• Field of knowledge: Engineering - Electrical Engineering
• Principal Investigator: Leonardo Andre Ambrosio
• Grantee: Guilherme Lorete Schmidt
• Host Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

This project aims to calculate the optical gradient and scattering forces exerted over dipolar particles by a class of structured beams known as continuous Frozen Wave (FW). A continuous FW is constructed by an appropriate integration of Bessel modes, with a longitudinal wave number spectrum chosen in such a way as to reproduce, along the optical axis of the beam, an axial intensity pattern previously specified in a spatial scale in the order of tens of micrometers. Because of this characteristic, a continuous FW becomes attractive in applications of light-matter interaction such as optical tweezers, atomic guiding, optical scalpels, photophoretic-trap 3D displays, among others. Reproducing results already published in the literature using the dipole force theory and producing new results based in expressions of radiation pressure shock sections arising from the generalized Lorenz Mie theory (GLMT), it is expected that the present project allows, beyond the natural formation of human resources in optics and photonics and the introduction of a high impact subject of intense investigation by the supervisor's research group, that the candidate advances in new and promising researches in electromagnetic scattering and light-matter interaction by spherical micro-particles. The schedule, divided in bimesters, comes accompanied by a description of a possible BEPE scholarship, already agreed to be performed, in the event of a future approval, at INSA Rouen, University of Rouen Normandy, France, under supervision of the professor emeritus Gérard Gouesbet, one of the most renowned researchers in the area of light scattering and associate researcher in the supervisor's recent projects with FAPESP.