Work

Fano-resonant mechanism of terajet formation using graphene-covered high-index mesoscale spheres

Year: 2024

Type: article

Abstract: Photonic jet in terahertz (THz) frequency range (terajet) plays an important role in modern THz scanning systems to achieve a superresolution beyond the diffraction limit. Based on analytical simulations, we introduce a synergetic effect of a mesoscale dielectric sphere and graphene to improve the focusing properties of a particle. We show that a graphene-covered dielectric sphere is able to enhance the field behind it if the refractive index is high. This conflicts with a generally accepted statement that a jet is generated only for low-index dielectrics with n < 2. We demonstrate the tunability of the terajet characteristics with respect to the graphene Fermi energy and discover a Fano resonance causing the field increase. This design leverages the tuning properties of the graphene allowing dynamic control over the power and size of the generated terajet in real time. With high-index materials, we get the opportunity for integration of terajet-assisted imaging with semiconductor technology.

Source: Optics Letters

DOI: 10.1364/ol.536827

Authors: A. G. Paddubskaya, A. V. Novitsky, O. V. Minin, I. V. Minin

Institutions: Belarusian State University, Tomsk Polytechnic University

Language: English

Topic: Near-Field Optical Microscopy

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Funder: Belarusian Republican Foundation for Fundamental Research

Award: G6724330248