Work

In-plane beam focusing via integrated photonic gradient-index subwavelength grating metalens

Year: 2024

Type: article

Abstract: We present an in-plane beam converter scheme that can focus a large Gaussian slab mode into a tightly focused spot approximately hundreds of micrometers away from the chip facet. Our approach involves designing the modal expander that converts a photonic waveguide mode to a large Gaussian slab mode and engineering the two-dimensional (2D) gradient-index subwavelength grating arrays that modify modal wavefront to be focused as the beam propagates. The device is designed on a monolithic silicon nitride scheme, which is transparent at the visible wavelength regime and readily available for the complementary metal-oxide-semiconductor process. Our device can be utilized in various chip-scale photonic applications, especially involving biochemical species and target samples ranging from one to tens of micrometer scales.

Source: Optics Express

DOI: 10.1364/oe.539591

Authors: Nafiz Jaidye, Jaewhan Lee, Daniel Pimbi, Myoung-Hwan Kim, Ayrton Bernussi, Sangsik Kim

Institution: Texas Tech University

Language: English

Topic: Photonic and Optical Devices

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funders: National Science Foundation, National Research Foundation of Korea, Institute for Information and Communications Technology Promotion