Journal articles

H. Lees, B. Chung, and W. Withayachumnankul, "Terahertz Doppler vibrometer based on homodyne quadrature interferometry," IEEE Transactions on Terahertz Science and Technology, 2026. (Accepted)

Y. Zhao, K.-D. Jenkel, M. Sakaki, H. Lees, W. Withayachumnankul, N. Benson, and J. C. Balzer, "3-D printed high-Q ceramic photonic crystal resonators for WR3-band applications," Journal of Infrared, Millimeter, and Terahertz Waves, vol. 47, art. no. 65, 2026.

F. Bertot, A. Tomasino, C. Y. Tam, W. Withayachumnankul, and I.-C. Benea-Chelmus, "Patch-array antennas for narrowband and large-aperture field-resolved detection of terahertz signals in hybrid silicon–organic photonic chips," APL Photonics, vol. 11, art. no. 096102, 2026.

D. Headland, M. Alonso-delPino, Y. Monnai, and W. Withayachumnankul, "Terahertz antennas: Engineering free-space interfaces for emerging wireless systems," IEEE Transactions on Terahertz Science and Technology, 2026. (Accepted)

H. Shiiba, W. Withayachumnankul, and T. Fukusako, "Direction-of-arrival estimation with 3D-printed rotating lens in sub-terahertz band," IEEE Transactions on Terahertz Science and Technology, 2026. (Accepted)

M. Abdullah, M. Larsson, M. Li, E. He, and W. Withayachumnankul, "All‑dielectric frequency‑diverse terahertz antenna for multi‑source direction‑of‑arrival estimation," IEEE Transactions on Terahertz Science and Technology, 2026. (Accepted)

N. H. Ngo, W. Gao, G. Ducournau, H. Khelil, R. Younes, P. Szriftgiser, H. Yamane, Y. Yamada, S. Murakami, W. Withayachumnankul, and M. Fujita, "Terahertz communications using effective‑medium‑slot waveguides," APL Engineering Physics, vol. 1, art. no. 026103, 2026.

C. Y. Tam, P. Dechwechprasit, R. T. Ako, M. Bhaskaran, A. Boes, K. Wang, C. Fumeaux, and W. Withayachumnankul, "Optically controlled terahertz-wave modulator on substrateless silicon waveguide," IEEE Transactions on Terahertz Science and Technology, vol. 16, no. 7, pp. 836–844, 2026.

J. Liang, M. Li, K. Jaruwongrungsee, M. Srirak, M. Sun, T. C. Ng, D. Headland, W. Withayachumnankul, "Steerable terahertz high-gain antenna based on low-temperature co-fired ceramic technology," IEEE Antennas Wireless Propagation Letters, 2026. (Accepted)

W. Gao, N. H. Ngo, D. Ichikawa, M. Li, Y. Inose, Y. Morita, H. Yamane, Y. Yamada, S. Murakami, Y. Nishida, T. Nagatsuma, W. Withayachumnankul, and M. Fujita, "Resonant tunneling diode-integrated terahertz transceiver module for wireless communications," Advanced Photonics Research, vol. 7, no. 4, art. no. e202500314, 2026.

S. Quader, C. Fumeaux, and W. Withayachumnankul, "Antenna-coupled terahertz electromechanical bolometer," APL Engineering Physics, vol. 1, no. 1, art. no. 016104, 2026.

B. Chung, H. Lees, J. Hesler, C. Chuengsatiansup, and W. Withayachumnankul, "Non-contact probing of active semiconductor devices using terahertz waves," IEEE Journal of Microwaves, vol. 6, no. 2, pp. 324–333, 2026.

L. Chen, W. Gao, C. Fumeaux, and W. Withayachumnankul, "Ultra-compact waveguide couplers for all-silicon terahertz platform," Advanced Photonics Research, vol. 7, no. 1, art. no. e202500247, 2026.

L. Chen, W. Gao, M. Abdullah, J. Hesler, C. Fumeaux, and W. Withayachumnankul, "All-dielectric bandpass filters for IEEE 802.15.3d terahertz communications," IEEE Transactions on Terahertz Science and Technology, vol. 16, no. 5, pp. 564–573, 2026.

S. Quader, M. Abdullah, E. He, C. Fumeaux, and W. Withayachumnankul, "3D-printed frequency-diverse metasurface for camera-based terahertz frequency analyzer," IEEE Microwave and Wireless Technology Letters, vol. 35, no. 12, pp. 2105–2108, 2025.

X. You, V. Pagay, and W. Withayachumnankul, "Non-contact monitoring of plant leaf water status using terahertz waves," Journal of Infrared, Millimeter, and Terahertz Waves, vol. 46, no. 8, art. no. 53, 2025.

D. Headland, H. Lees, W. Withayachumnankul, G. Carpintero, "Broadband point source for terahertz silicon guides," IEEE Antennas and Wireless Propagation Letters, vol. 24, no. 11, pp. 4393–4397, 2025.

Special Cluster on Terahertz Antennas for 6G and Beyond: Innovative Design, Manufacturing, and Advanced Applications

M. Sun, H. Lees, and W. Withayachumnankul, "All-dielectric tapered rod antenna with sub-wavelength grating for terahertz waves," IEEE Antennas and Wireless Propagation Letters, vol. 24, no. 11, pp. 4368–4372, 2025.

Special Cluster on Terahertz Antennas for 6G and Beyond: Innovative Design, Manufacturing, and Advanced Applications

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, vol. 15, no. 3, pp. 473–480, 2025.

X. You, R. T. Ako, S. Sriram, and W. Withayachumnankul, "3D terahertz confocal imaging with chromatic metasurface," Laser & Photonics Reviews, vol. 19, no. 7, art. no. 2401011, 2025.

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.

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.

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, vol. 73, no. 9, pp. 5876–5884, 2025.

Special Issue on Emerging Materials and Processing Technologies for RF/Microwave Applications and Wireless Systems

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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, pp. 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.

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.

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.

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.

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.

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, art. no. 1900750, 2020.

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

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.

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.

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.

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

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.

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.

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.