Axicon metalens for broadband light harvesting

Kai Hao Chang, Yen Chun Chen, Yo Song Huang, Wei Lun Hsu, Guo Hao Lu, Chao Feng Liu, Chun Jen Weng, Yu Hsin Lin, Che Chin Chen, Chien Chieh Lee, Yu Chi Chang, Po Hsiang Wang, Chih Ming Wang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


In this study, an axicon metalens comprising a large central disc surrounded by nanoposts for energy harvesting in composite metal-oxide semiconductor sensors was designed, fabricated, and experimentally characterized. The main role of the central disc is focusing light; the nanoposts of various diameters deflect light to form a Bessel-like beam. The spatial distribution of the optical transmission was measured using micro-hyperspectral imaging. The axicon metalens concentrates the light to the sensitive area of the sensor and also harvests light from adjacent pixels. After adding an axicon metalens, the normalized peak transmission is up to 250% at λ = 700 nm as compared to a blank TiO2 film. The experimental results had fair agreement with the finite-difference-time-domain simulation. The ultra-broadband energy-harvesting performance of the sensor suggests that it could be applied in surveillance and Internet of Things applications.

Original languageEnglish
Pages (from-to)1309-1315
Number of pages7
Issue number7
StatePublished - 1 Apr 2023


  • axicon
  • color router
  • hyperspectral imaging
  • imaging sensor
  • light harvest
  • metalens


Dive into the research topics of 'Axicon metalens for broadband light harvesting'. Together they form a unique fingerprint.

Cite this