Publications

B. Chung, H. Lees, M. Ibrahim, D. Headland, and W. Withayachumnankul, “Highly efficient terahertz dark-field imaging system with 3D-printed components,” Journal of Physics: Photonics, vol. 7, no. 2, art. no. 025012, 2025.

Invited

M. Abdullah, E. He, M. Shehata, K. Wang, and W. Withayachumnankul, "Nonlinearity compensation for terahertz communications through neural networks," Optics Express, vol. 33, no. 5, pp. 11178–11191, 2025.

W. Gao, M. Fujita, S. Murakami, T. Nagatsuma, C. Fumeaux, and W. Withayachumnankul, “Ultra-wideband terahertz integrated polarization multiplexer,” Laser & Photonics Reviews, vol. 19, no. 1, art. no. 2400270, 2025.

Covered by IEEE Spectrum, EurekAlert and other online scientific news media

X. You, R. T. Ako, S. Sriram, and W. Withayachumnankul, "3D terahertz confocal imaging with chromatic metasurface," Laser & Photonics Reviews, art. no. 2401011, 2025. (Accepted)

L. Chen, W. Gao, C. Fumeaux, and W. Withayachumnankul, "Terahertz integrated polarization filter based on slotted Bragg grating," IEEE Transactions on Terahertz Science and Technology, 2024. (Accepted)

H. Lees, M. Sakaki, D. Headland, N. Benson, J. C. Balzer, and W. Withayachumnankul, "Terahertz stepped-height waveguide with 3D-printing," IEEE Transactions on Microwave Theory and Techniques, 2024. (Accepted)

D. Headland, P. Dechwechprasit, and W. Withayachumnankul, “Monolithically integrated mode converter from terahertz substrateless silicon guide to conductive slotline” Applied Physics Letters, vol. 125, art. no. 071101, 2024.

Invited

Special Collection: Hybrid and Heterogeneous Integration in Photonics: From Physics to Device Applications

H. Lees, D. Headland, and W. Withayachumnankul, “Terahertz extreme skin-depth waveguides,” IEEE Transactions on Terahertz Science and Technology, vol. 14, no. 5, pp. 758–767, 2024.

B. Chung, D. Headland, W. Withayachumnankul, “Terahertz imaging with 3D-printed Risley-prism and telecentric objective,” IEEE Transactions on Terahertz Science and Technology, vol. 14, no. 4, pp. 446–454, 2024.

S. Quader, R.-T. Ako, S. Sriram, C. Fumeaux, and W. Withayachumnankul, “Mechanically reconfigurable polarization converter for terahertz waves,” IEEE Transactions on Terahertz Science and Technology, vol. 14, no. 4, pp. 502–509, 2024.

H. Lees, D. Headland, S. Murakami, M. Fujita, and W. Withayachumnankul, “Terahertz radar with all-dielectric leaky-wave antenna,” APL Photonics, vol. 9, no. 3, art. no. 036107, 2024.

D. Headland, A. Kumar, H. Lees, W. Withayachumnankul, G. Carpintero, “Matched dielectric slot waveguide as all-dielectric terahertz magnetic dipole,” Optics Letters, vol. 49, no. 5, pp. 1361–1364, 2024.

Editor's pick

M. Li, M. Abdullah, J. He, K. Wang, C. Fumeaux, and W. Withayachumnankul, “Frequency-diverse antenna with convolutional neural networks for direction of arrival estimation in terahertz communications,” IEEE Transactions on Terahertz Science and Technology, vol. 14, no. 3, pp. 354–363, 2024.

Featured article 

M. Li, R.-T. Ako, S. Sriram, C. Fumeaux, and W. Withayachumnankul, “Terahertz planar cavity antenna based on effective medium for wireless communications,” IEEE Transactions on Terahertz Science and Technology,  vol. 14, no. 2, pp. 248–257, 2024.

P. Dechwechprasit, H. Lees, D. Headland, C. Fumeaux, and W. Withayachumnankul, “1-to-N terahertz integrated switches enabling multi-beam antennas,” Optica, vol. 10, no. 11, pp. 1551–1558, 2023.

J. Carter, H. Lees, Q. Wang, S. Chen, S. Atakaramians, and W. Withayachumnankul, “Terahertz properties of common microwave dielectric materials,” Journal of Infrared, Millimeter, and Terahertz Waves, vol. 44, pp. 873–884, 2023.

M. Shehata, K. Wang, and W. Withayachumnankul, "Carrierless amplitude and phase modulation for terahertz communications," IEEE Journal of Selected Topics in Quantum Electronics, vol. 29, no. 5, art. no. 8600714, 2023.

Special Issue on Terahertz Photonics

D. Headland, M. Fujita, G. Carpintero, T. Nagatsuma, and W. Withayachumnankul, "Tutorial: Terahertz integration platforms using substrateless all-silicon microstructures," APL Photonics,  vol. 8, art. no. 091101, 2023.

Invited

Featured article 

P. Dechwechprasit, R. T. Ako, S. Sriram, C. Fumeaux, and W. Withayachumnankul, "Terahertz disk resonator on substrateless dielectric waveguide platform," Optics Letters, vol. 48, no. 17, pp. 4685–4688, 2023.

H. Lees, C. Hayes, and W. Withayachumnankul, "Terahertz coherence tomography for in-container liquid characterization," IEEE Journal of Selected Topics in Quantum Electronics,  vol. 29, no. 5, art. no. 8600408, 2023.

Special Issue on Terahertz Photonics

Featured by IEEE Photonics Society

M. Li, R.-T. Ako, S. Sriram, C. Fumeaux, and W. Withayachumnankul, "Terahertz metasurface for near-field beam conversion," Optics Letters,  vol. 48, no. 8, pp. 2202–2205, 2023.

Editor's pick

M. Li, T. V. Mai, C. Fumeaux, S. Suzuki, and W. Withayachumnankul, "Terahertz resonant-tunneling diode with series-fed patch array antenna," IEEE Transactions on Terahertz Science and Technology, vol. 13, no. 2, pp. 178–187, 2023.

Among top 5 popular articles March 2023

X. You, R. T. Ako, M. Bhaskaran, S. Sriram, C. Fumeaux, and W. Withayachumnankul, "Mechanically tunable terahertz circular polarizer with versatile functions," Laser & Photonics Reviews, art. no. 2200305, 2023.

J. C. Balzer, C. J. Saraceno, M. Koch, P. Kaurav, U. R. Pfeiffer, W. Withayachumnankul, T. Kürner, A. Stöhr, M. El-absi, A. Al-haj Abbas, T. Kaiser, and A. Czylwik, "THz systems exploiting photonics and communications technologies," IEEE Journal of Microwaves, vol. 3, no. 1, pp. 268–288, 2023.

Invited

D. Headland and W. Withayachumnankul, "News and Views—In the shadow of the laser phantom needle cross: Dynamic air-plasma aperture sheds light on terahertz microscopy," Light: Science & Applications, vol. 11, art. no. 147, 2022.

X. You, C. Fumeaux, and W. Withayachumnankul, “Tutorial on broadband transmissive metasurfaces for wavefront and polarization control of terahertz waves,” Journal of Applied Physics,  vol. 131, art. no. 061101, 2022.

Invited for Special Topic Collection "Metasurfaces for Photonic Devices", guest edited by I. Staude, H.-T. Chen, A. Miroshnichenko, J. Takahara, and W. J. Padilla.

Editor's pick;  Among most-read editor's picks; 2022 Early Career Investigator Selection

X. Lv, R. T. Ako, M. Bhaskaran, S. Sriram, C. Fumeaux, and W. Withayachumnankul, “Frequency-selective surface based mechanically reconfigurable terahertz bandpass filter,” IEEE Transactions on Terahertz Science and Technology,  vol 12, no. 3, pp 257–266, 2022.

Highlighted in IEEE MTT-S Newsletter, March 2022

Among top 5 popular articles February 2022 

M. Shehata, K. Wang, J. Webber, M. Fujita, T. Nagatsuma, and W. Withayachumnankul, “Timing-jitter tolerant Nyquist pulse for terahertz communications,” Journal of Lightwave Technology,  vol. 40, no. 2, pp. 557–564, 2022.

Special Issue on Optical Systems and Technologies for 6G Mobile Networks

H. Lees, W. Gao, and W. Withayachumnankul, "All-silicon, low-crosstalk terahertz waveguide crossing based on effective medium," Optics Letters, vol. 46, no. 21, pp. 5469–5472, 2021.

M. Shehata, K. Wang, J. Webber, M. Fujita, T. Nagatsuma, and W. Withayachumnankul, "IEEE 802.15.3d-compliant waveforms for terahertz wireless communications," Journal of Lightwave Technology, vol. 39, no. 24, pp. 7748–7760, 2021.

Special Issue on Microwave Photonics

X. You, R. T. Ako, W. S.-L. Lees, M. Bhaskaran, S. Sriram, C. Fumeaux, and W. Withayachumnankul, "Terahertz transmissive half-wave metasurface with enhanced bandwidth," Optics Letters,  vol. 46, no. 17, 4164–4167, 2021.

W. Gao, W. S.-L. Lees, C. Fumeaux, and W. Withayachumnankul, "Effective-medium-clad Bragg grating filters," APL Photonics, vol. 6, no. 7, art. no. 076105, 2021.

J. Liang, W. Gao, H. Lees, and W. Withayachumnankul, "All-silicon terahertz planar horn antenna," IEEE Antennas and Wireless Propagation Letters, vol. 20, no. 11, pp. 2181–2185, 2021.

Special Cluster on "Antenna Considerations for Future Millimeter-Wave and Terahertz Wireless Systems"

D. Headland, W. Withayachumnankul, M. Fujita, and T. Nagatsuma, "Gratingless integrated tunneling multiplexer for terahertz waves," Optica, vol. 8, no. 5, pp. 621–629, 2021. 

Covered by ARC, OSA Optics & Photonics News, Phys.org, and other online scientific news media; Special collection of standout research in integrated photonics

M. E. Ibrahim, D. Headland, W. Withayachumnankul, and C. H. Wang, "Nondestructive testing of defects in polymer-matrix composite materials for marine applications using terahertz waves," Journal of Nondestructive Evaluation, vol. 40, art. no. 37, 2021.

W. Gao, W. S.-L. Lee, X. Yu, M. Fujita, T. Nagatsuma, C. Fumeaux, and W. Withayachumnankul, "Characteristics of effective-medium-clad dielectric waveguides," IEEE Transactions on Terahertz Science and Technology, vol. 11, no. 1, pp. 28–41, 2021.

W. S.-L. Lee, A. Ferrante, W. Withayachumnankul, and J. A. Able, "Assessing frost damage in barley using terahertz imaging," Optics Express, vol. 28, no. 21, pp. 30644–30655, 2020.

Covered by Optics & Photonics News, Phys.org, and other online scientific news media

D. Headland, W. Withayachumnankul, X. Yu, M. Fujita, and T. Nagatsuma, “Unclad microphotonics for terahertz waveguides and systems,” Journal of Lightwave Technology, vol. 38, no. 24, pp. 6853–6862, 2020.

X. You, R. T. Ako, W. S.-L. Lee, M. Bhaskaran, S. Sriram, C. Fumeaux, and W. Withayachumnankul, “Broadband terahertz transmissive quarter-wave metasurface," APL Photonics, vol. 5, no. 9, art. no. 096108, 2020.

2020 Future Luminary Award Finalists

H. Li, M. X. Low, R. T. Ako, M. Bhaskaran, S. Sriram, W. Withayachumnankul, B. T. Kuhlmey, and S. Atakaramians, “Broadband single-mode hybrid photonic crystal waveguides for terahertz integration on a chip,” Advanced Materials Technologies, vol. 5, no. 7, art. no. 2000117, 2020.

Inside front cover

R. T. Ako, W. S. L. Lee, S. Atakaramians, M. Bhaskaran, S. Sriram, and W. Withayachumnankul, “Ultra-wideband tri-layer transmissive linear polarization converter for terahertz waves,” APL Photonics, vol. 5, no. 4, art. no. 046101, 2020.

Editor’s pick

2020 Future Luminary Award Finalists

X. You, A. Upadhyay, Y. Cheng, M. Bhaskaran, S. Sriram, C. Fumeaux, and W. Withayachumnankul, “Ultra-wideband far-infrared absorber based on anisotropically-etched doped silicon,” Optics Letters, vol. 45, no. 5, pp. 1196–1199, 2020.

A. Ebrahimi. R. T. Ako, W. S. L. Lee, M. Bhaskaran, S. Sriram, and W. Withayachumnankul, “High-Q terahertz absorber with stable angular response,” IEEE Transactions on Terahertz Science and Technology, vol. 10, no. 2, pp. 204–211, 2020. 

R. T. Ako, A. Upadhyay, W. Withayachumnankul, M. Bhaskaran, and S. Sriram, “Dielectrics for terahertz metasurfaces: Material selection and fabrication techniques,” Advanced Optical Materials, vol. 8, no. 3, 1900750, 2020.

Invited

W. Gao, X. Yu, M. Fujita, T. Nagatsuma, C. Fumeaux, and W. Withayachumnankul, “Effective-medium-cladded dielectric waveguides for terahertz waves,” Optics Express, vol. 27, no. 26, pp. 38721–38734, 2019.

Supplementary video

Among top downloads in terahertz optics and imaging 

R. T. Ako, W. S.-L. Lee, M. Bhaskaran, S. Sriram, and W. Withayachumnankul, “Broadband and wide-angle reflective linear polarization converter for terahertz waves,” APL Photonics, vol. 4, no. 9, art. no. 096104, 2019.

Editor’s pick

X. You, R. T. Ako, W. S.-L. Lee, M. X. Low, M. Bhaskaran, S. Sriram, C. Fumeaux, and W. Withayachumnankul, “Terahertz reflectarray with enhanced bandwidth,” Advanced Optical Materials, vol. 7, no. 20, art. no. 1900791, 2019.

Inside front cover

D. Headland, W. Withayachumnankul, R. Yamada, M. Fujita, and T. Nagatsuma, “Terahertz multi-beam antenna using photonic crystal waveguide and Luneburg lens,” APL Photonics, vol. 3, art. no. 126105, 2018.

Featured article

W. Withayachumnankul, M. Fujita, and T. Nagatsuma, “Integrated silicon photonic crystals towards terahertz communications,” Advanced Optical Materials. vol. 6, art. no. 1800401, 2018. 

Invited

W. S.-L. Lee, R. T. Ako, M. X. Low, M. Bhaskaran, S. Sriram, C. Fumeaux, and W. Withayachumnankul, “Dielectric-resonator metasurfaces for broadband terahertz quarter- and half-wave mirrors,” Optics Express, vol. 26, no. 11, pp. 14392–14406, 2018. 

W. Withayachumnankul, R. Yamada, M. Fujita, and T. Nagatsuma, “All-dielectric rod antenna array for terahertz communications,” APL Photonics, vol. 3, no. 5, art. no. 051707, 2018. 

Featured article

The design was mentioned in ‘News & Views: Terahertz surprises’, Nature Photonics, 12, 128–130, 2018; http://rdcu.be/HQrO 

D. Headland, Y. Monnai, D. Abbott, C. Fumeaux, and W. Withayachumnankul, “Tutorial: Terahertz beamforming, from concepts to realizations,” APL Photonics, vol. 3, art. no. 051101, 2018. 

Invited for special issue on Frontiers on THz Photonic Devices

W. S.-L. Lee, S. Nirantar, D. Headland, M. Bhaskaran, S. Sriram, C. Fumeaux, and W. Withayachumnankul, “Broadband terahertz circular-polarization beam splitter,” Advanced Optical Materials, vol. 6, no. 3, art. no. 1700852, 2018. 

Front cover

Among the Best of Advanced Optical Materials 2018

• W. Withayachumnankul, "Terahertz sensing and communications enabled by substrateless integrated platform," Optica Advanced Photonics, Marseille, 2025. (Invited)

• W. Withayachumnankul, "Substrateless Platform: A Promising Route to Terahertz Integration," IEEE MTT-S International Microwave Symposium, San Francisco, 2025. (Invited)

• S. Quader, X. Lv, X. You, R. T. Ako, M. Bhaskaran, S. Sriram, C. Fumeaux, and W. Withayachumnankul, "Mechanically reconfigurable terahertz quasi-optical components for spectral filtering and polarization control," IEEE Microwaves, Antennas and Propagation Conference (MAPCON), Hyderabad, 2024. (Invited)

• W. Gao, W. Withayachumnankul, T. Nagatsuma, and M. Fujita, “Photonics-inspired terahertz components and systems advancing 6g communications," International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW), Guangzhou, 2024. (Invited)

• M. Sun, N. Nguyen-Trong, and W. Withayachumnankul, “All-dielectric terahertz 1D leaky-wave antenna based on vertically asymmetric grating,” 29th International Symposium on Antennas and Propagation (ISAP), Incheon, 2024. (Invited)

• B. Chung, D. Headland, M. Ibrahim, and W. Withayachumnankul, “3D-printed quasi-optics for sub-terahertz range,” 49th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), Perth, 2024. (Keynote)

• N. H. Ngo, W. Gao, M. (Stephen) Li, W. Withayachumnankul, and M. Fujita, “Terahertz slot waveguide for taperless interfacing,” 49th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), Perth, 2024.  (Keynote) 

• H. Lees, D. Joseph, Y. Yarom, and W. Withayachumnankul, “Terahertz waves for sensing acoustic vibrations,” Asia-Pacific Microwave Conference (APMC), Bali, 2024. (Invited)

• X. You, R.-T. Ako, S. Sriram, and W. Withayachumnankul, "Experimental realization of terahertz 3D imaging with chromatic metasurface," Asia-Pacific Microwave Conference (APMC), Bali, 2024. (Invited)

• W. Gao, W. Withayachumnankul, and M. Fujita, "Silicon-based terahertz integration: Driving 6G communications", 15th International Conference on Information Optics and Photonics (CIOP), Xi'an, 2024. (Invited)

• P. Dechwechprasit, H. Lees, D. Headland, C. Fumeaux, and W. Withayachumnankul, "Photoexcited multiport terahertz integrated switches with demonstration of multi-beam antennas," SPIE Photonics Europe: Terahertz Photonics III, Strasbourg, 2024. (Invited)

• M. Li, R.-T. Ako, S. Sriram, C. Fumeaux, and W. Withayachumnankul, "High-gain, low-profile, integrable planar lens antenna at 275 GHz," IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP), Guangzhou, 2023. (Invited)

• W. Withayachumnankul, "Substrateless integrated platform for terahertz wireless frontends," 16th UK-Europe-China Workshop on Millimeter Waves and Terahertz Technologies (UCMMT), Guangzhou, 2023. (Invited)

• B. Chung, D. Headland, and W. Withayachumnankul, "3D-printed quasi-optical components for terahertz applications," IEEE International Symposium on Radio-Frequency Integration Technology, Cairns, 2023. (Invited)

• W. Gao, W. Withayachumnankul, M. Fujita, and T. Nagatsuma, “Terahertz communications accelerated by photonics technologies,” 14th International Conference on Information Optics and Photonics (CIOP), Xi’an, 2023. (Invited) 

• H. Lee, M. Sakaki, D. Headland, N. Benson, J. Balzer, and W. Withayachumnankul, "Single-mode rib waveguide for the terahertz range using 3D printed alumina," International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), Montreal, 2023. (Keynote)

• L. Chen, W. Gao, C. Fumeaux, and W. Withayachumnankul, "Compact broadband terahertz filter based on effective medium," 5th Australian Microwave Symposium, Melbourne, 2023. (Best Student Paper)

• P. Dechwechprasit, C. Fumeaux, W. Withayachumnankul, "Resonant cavities based on substrateless dielectric waveguide platform for terahertz integrated systems," IEEE Region 10 Conference (TENCON). Hong Kong, 2022. (Invited; online)

• H. Lees, D. Headland, and W. Withayachumnankul, "Integrated, broadband, arbitrary-ratio power division based on air-silicon effective mediums," IRMMW-THz, Delft, 2022. (Keynote)

• H. Lees, D. Headland, and W. Withayachumnankul, "Substrateless terahertz integrated platform: Low-cross-talk waveguide crossing," International Symposium on Future Trends of Terahertz Semiconductor Technologies (TST), Kyoto, 2022. (Invited; online)

• W. Withayachumnankul, "Systematically designed broadband terahertz metasurfaces," 5th IEEE Workshop on Recent Advances in Photonics, Mumbai, 2022. (Invited; online)

• M. Shehata, K. Wang, and W. Withayachumnankul, "Terahertz pulse shaping using microwave-photonic delay line filters," IRMMW-THz, Chengdu, 2021. (Keynote; online) 

• M. Li, S. Suzuki, C. Fumeaux, and W. Withayachumnankul, "Improving the radiation performance of resonant-tunneling diode by using planar metallic arrays," IRMMW-THz, Chengdu, 2021. (Keynote; online)

• W. Gao, W. S.-L. Lee, C. Fumeaux, and W. Withayachumnankul, "Integrated terahertz band-stop filter based on effective medium," IRMMW-THz, Chengdu, 2021. (Keynote; online)

• X. You, C. Fumeaux, and W. Withayachumnankul, "Concept of mechanically tunable terahertz circular polarizer," 11th International Conference on Metamaterials, Photonic Crystals and Plasmonics (META), Warsaw, 2021. (Invited; online)

• X. You, C. Fumeaux, and W. Withayachumnankul, "Systematically designed broadband terahertz metasurfaces," SPIE Next-Generation Spectroscopic Technologies XIV, Florida, 2021 (Invited; online)

• W. Gao, C. Fumeaux, and W. Withayachumnankul, "All-silicon terahertz components towards efficient integrated systems," IRMMW-THz, Buffalo, 2020. (Keynote; online)

• W. Gao, X. Yu, M. Fujita, T. Nagatsuma, C. Fumeaux, and W. Withayachumnankul, "Evolution from air-cladded to effective-medium-cladded dielectric waveguides," IRMMW-THz, Paris, 2019. (Keynote)

• W. Withayachumnankul, M. Fujita, and T. Nagatsuma, “Polarization responses of terahertz dielectric rod antenna arrays,” International Conference on Microwave and Millimeter Wave Technology (ICMMT), Guangzhou, 2019. (Invited)

• W. Withayachumnankul, “Terahertz metasurfaces for beamforming and polarization conversion,” Asia-Pacific Microwave Conference (APMC), Kyoto, 2018. (Invited)

• W. Withayachumnankul, R. Yamada, M. Fujita, and T. Nagatsuma, “Evolution of rod antennas for integrated terahertz photonics,” IRMMW-THz, Nagoya, 2018. (Keynote)

• W. Withayachumnankul, “Terahertz metasurfaces,” IRMMW-THz, Nagoya, 2018. (Student workshop) 

• W. S.-L. Lee, C. Fumeaux, and W. Withayachumnankul, “Metasurfaces for terahertz polarimetry,” IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP), Auckland, 2018. (Invited)

• C. Fumeaux, W. S.-L. Lee, D. Headland, T. Niu, S. Sriram, M. Bhaskaran, and W. Withayachumnankul, “Terahertz reflectarrays for beam manipulation and polarization control,” IEEE International Symposium on Antennas and Propagation (ISAP), Boston, 2018. (Invited)