3D printed THz Aplanatic Metalens for Achromatic focusing with High-Resolution

J. Chen; G. B. Wu; C. H. Chan

doi:10.1109/metamaterials65622.2025.11174233

3D printed THz Aplanatic Metalens for Achromatic focusing with High-Resolution

J. Chen
, G. B. Wu
, C. H. Chan

State Key Laboratory of Terahertz and Millimeter Waves (City University of Hong Kong)

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

Abstract

Inspired by optical metalens, terahertz (THz) metalenses have been developed rapidly in the last decade. Numerous functionalities, such as achromatic focusing and super-resolution imaging, were realized. However, previous works have concentrated on eliminating chromatic aberrations, while accomplishing aberration-free THz metalens in both chromatic and spherical aberrations is still a big challenge. In this paper, an aplanatic achromatic THz metalens with a large numerical aperture (NA) of 0.61 is achieved by gradient metamaterials and fabricated by 3D printing. Measured results demonstrate that spherical aberration-free achromatic focusing with a full width at half maximum (FWHM) of about 0.82λ is fulfilled in the range of 0.1THz to 0.6THz. © 2025 IEEE.

Original language	English
Title of host publication	2025 Nineteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials)
Publisher	IEEE
Pages	58-60
ISBN (Electronic)	979-8-3315-3656-5
ISBN (Print)	979-8-3315-3657-2
DOIs	https://doi.org/10.1109/metamaterials65622.2025.11174233
Publication status	Published - Sept 2025
Event	19th International Congress on Artificial Materials for Novel Wave Phenomena - Amsterdam, Netherlands Duration: 1 Sept 2025 → 6 Sept 2025

Publication series

Name	International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)
ISSN (Print)	2573-2684
ISSN (Electronic)	2573-2706

Conference

Conference	19th International Congress on Artificial Materials for Novel Wave Phenomena
Abbreviated title	Metamaterials'2025
Place	Netherlands
City	Amsterdam
Period	1/09/25 → 6/09/25

Funding

This work is supported by the IEEE Antennas and Propagation Society Fellowship, the Hong Kong Research Grants Council General Research Fund (CityU 11217720), and Collaborative Research (C1009-22G)

RGC Funding Information

RGC-funded

Access Output

10.1109/metamaterials65622.2025.11174233

Other Access Options

Check CityUHK Library

Permanent Link

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1 Finished
1 Active

CRF: An Enabling Technology for 6G Wireless Communications
CHAN, C. H. (Principal Investigator / Project Coordinator), HUANG, K. (Co-Principal Investigator), Li, C. (Co-Principal Investigator), MAK, P. I. (Co-Principal Investigator), WANG, H. (Co-Principal Investigator), WONG, H. (Co-Principal Investigator) & CHIEN, W. T. K. (Collaborator)
1/06/23 → …
Project: Research
GRF: Enabling Technology for 3D Mueller Polarimetric Imaging at Terahertz Frequencies
CHAN, C. H. (Principal Investigator / Project Coordinator)
1/10/20 → 11/03/25
Project: Research

Cite this

Chen, J., Wu, G. B., & Chan, C. H. (2025). 3D printed THz Aplanatic Metalens for Achromatic focusing with High-Resolution. In 2025 Nineteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) (pp. 58-60). (International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)). IEEE. https://doi.org/10.1109/metamaterials65622.2025.11174233

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title = "3D printed THz Aplanatic Metalens for Achromatic focusing with High-Resolution",

abstract = "Inspired by optical metalens, terahertz (THz) metalenses have been developed rapidly in the last decade. Numerous functionalities, such as achromatic focusing and super-resolution imaging, were realized. However, previous works have concentrated on eliminating chromatic aberrations, while accomplishing aberration-free THz metalens in both chromatic and spherical aberrations is still a big challenge. In this paper, an aplanatic achromatic THz metalens with a large numerical aperture (NA) of 0.61 is achieved by gradient metamaterials and fabricated by 3D printing. Measured results demonstrate that spherical aberration-free achromatic focusing with a full width at half maximum (FWHM) of about 0.82λ is fulfilled in the range of 0.1THz to 0.6THz. {\textcopyright} 2025 IEEE.",

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doi = "10.1109/metamaterials65622.2025.11174233",

language = "English",

isbn = "979-8-3315-3657-2",

series = "International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)",

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booktitle = "2025 Nineteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials)",

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note = "19th International Congress on Artificial Materials for Novel Wave Phenomena, Metamaterials'2025 ; Conference date: 01-09-2025 Through 06-09-2025",

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Chen, J, Wu, GB & Chan, CH 2025, 3D printed THz Aplanatic Metalens for Achromatic focusing with High-Resolution. in 2025 Nineteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials). International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS), IEEE, pp. 58-60, 19th International Congress on Artificial Materials for Novel Wave Phenomena, Amsterdam, Netherlands, 1/09/25. https://doi.org/10.1109/metamaterials65622.2025.11174233

3D printed THz Aplanatic Metalens for Achromatic focusing with High-Resolution. / Chen, J.; Wu, G. B.; Chan, C. H.
2025 Nineteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials). IEEE, 2025. p. 58-60 (International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)).

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

TY - GEN

T1 - 3D printed THz Aplanatic Metalens for Achromatic focusing with High-Resolution

AU - Chen, J.

AU - Wu, G. B.

AU - Chan, C. H.

PY - 2025/9

Y1 - 2025/9

N2 - Inspired by optical metalens, terahertz (THz) metalenses have been developed rapidly in the last decade. Numerous functionalities, such as achromatic focusing and super-resolution imaging, were realized. However, previous works have concentrated on eliminating chromatic aberrations, while accomplishing aberration-free THz metalens in both chromatic and spherical aberrations is still a big challenge. In this paper, an aplanatic achromatic THz metalens with a large numerical aperture (NA) of 0.61 is achieved by gradient metamaterials and fabricated by 3D printing. Measured results demonstrate that spherical aberration-free achromatic focusing with a full width at half maximum (FWHM) of about 0.82λ is fulfilled in the range of 0.1THz to 0.6THz. © 2025 IEEE.

AB - Inspired by optical metalens, terahertz (THz) metalenses have been developed rapidly in the last decade. Numerous functionalities, such as achromatic focusing and super-resolution imaging, were realized. However, previous works have concentrated on eliminating chromatic aberrations, while accomplishing aberration-free THz metalens in both chromatic and spherical aberrations is still a big challenge. In this paper, an aplanatic achromatic THz metalens with a large numerical aperture (NA) of 0.61 is achieved by gradient metamaterials and fabricated by 3D printing. Measured results demonstrate that spherical aberration-free achromatic focusing with a full width at half maximum (FWHM) of about 0.82λ is fulfilled in the range of 0.1THz to 0.6THz. © 2025 IEEE.

U2 - 10.1109/metamaterials65622.2025.11174233

DO - 10.1109/metamaterials65622.2025.11174233

M3 - RGC 32 - Refereed conference paper (with host publication)

SN - 979-8-3315-3657-2

T3 - International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)

SP - 58

EP - 60

BT - 2025 Nineteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials)

PB - IEEE

T2 - 19th International Congress on Artificial Materials for Novel Wave Phenomena

Y2 - 1 September 2025 through 6 September 2025

ER -

Chen J, Wu GB , Chan CH. 3D printed THz Aplanatic Metalens for Achromatic focusing with High-Resolution. In 2025 Nineteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials). IEEE. 2025. p. 58-60. (International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)). Epub 2025 Sept 26. doi: 10.1109/metamaterials65622.2025.11174233

3D printed THz Aplanatic Metalens for Achromatic focusing with High-Resolution

Abstract

Publication series

Conference

Funding

RGC Funding Information

Access Output

Other Access Options

Permanent Link

Fingerprint

Projects

CRF: An Enabling Technology for 6G Wireless Communications

GRF: Enabling Technology for 3D Mueller Polarimetric Imaging at Terahertz Frequencies

Cite this