Endless single-mode photonics crystal fiber metalens for broadband and efficient focusing in near-infrared range

Qiancheng Zhao, Jiaqi Qu, Gang Ding Peng, Changyuan Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

The advent of the lab-on-fiber concept has boosted the prosperity of optical fiber-based platforms integrated with nanostructured metasurface technology which are capable of controlling the light at the nanoscale for multifunctional applications. Here, we propose an endless single-mode large-mode-area photonic crystal fiber (LMA-PCF) integrated metalens for broadband and efficient focusing from 800 to 1550 nm. In the present work, the optical properties of the substrate LMA-PCF were investigated, and the metalens, consisting of dielectric TiO2 nanorods with varying radii, was elaborately designed in the fiber core region with a diameter of 48 μm to cover the required phase profile for efficient focusing with a high transmission. The focusing characteristics of the designed metalens were also investigated in detail over a wide wavelength range. It is shown that the in-fiber metalens is capable of converging the incident beams into the bright, symmetric, and legible focal spots with a large focal length of 315-380 μm depending on the operating wavelength. A high and average focusing efficiency of 70% was also obtained with varying wavelengths. It is believed the proposed fiber metalens may show great potential in applications including fiber laser configuration, machining, and fiber communication.

Original languageEnglish
Article number219
JournalMicromachines
Volume12
Issue number2
DOIs
Publication statusPublished - Feb 2021

Keywords

  • Broadband
  • Fiber-integrated device
  • Focusing efficiency
  • Metalens
  • Optical fiber

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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