Pub Date : 2025-03-05DOI: 10.1109/TTHZ.2025.3544854
{"title":"IEEE Microwave Theory and Techniques Society Information","authors":"","doi":"10.1109/TTHZ.2025.3544854","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3544854","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 2","pages":"C2-C2"},"PeriodicalIF":3.9,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10910275","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-05DOI: 10.1109/TTHZ.2025.3544945
{"title":"IEEE Open Access Publishing","authors":"","doi":"10.1109/TTHZ.2025.3544945","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3544945","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 2","pages":"304-304"},"PeriodicalIF":3.9,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10910283","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-05DOI: 10.1109/TTHZ.2025.3544898
{"title":"IEEE Transactions on Terahertz Science and Technology Publication Information","authors":"","doi":"10.1109/TTHZ.2025.3544898","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3544898","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 2","pages":"C3-C3"},"PeriodicalIF":3.9,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10910279","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-05DOI: 10.1109/TTHZ.2025.3544896
{"title":"IEEE Transactions on Terahertz Science and Technology Information for Authors","authors":"","doi":"10.1109/TTHZ.2025.3544896","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3544896","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 2","pages":"300-301"},"PeriodicalIF":3.9,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10910274","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-05DOI: 10.1109/TTHZ.2025.3544936
{"title":"TechRxiv: Share Your Preprint Research with the World!","authors":"","doi":"10.1109/TTHZ.2025.3544936","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3544936","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 2","pages":"303-303"},"PeriodicalIF":3.9,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10910284","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-05DOI: 10.1109/TTHZ.2025.3544914
{"title":"IEEE Women in Engineering","authors":"","doi":"10.1109/TTHZ.2025.3544914","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3544914","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 2","pages":"302-302"},"PeriodicalIF":3.9,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10910278","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-27DOI: 10.1109/TTHZ.2025.3534749
Qiyuan Mu;Shijie Wang;Depeng Kong;Yuan Yuan;Zhen Liu
In this article, a high birefringence and low loss polarization-maintaining terahertz waveguide based on the antiresonant mechanism is proposed, of which the cladding comprises six circular tubes and four curved thin walls. The thickness difference between the horizontal outer tubes and the vertical circular tubes brings a high birefringence, which can be further improved by the structural difference attributable to the nested tubes. Moreover, the nested tubes and four curved thin walls also reduce waveguide losses. The simulated results show that the birefringence of the designed waveguide at 0.14 THz is 0.00165, and the x-polarized and y-polarized loss is 0.096 dB/cm and 0.104 dB/cm, respectively. In addition, fabricated waveguides by three-dimensional printing technology are characterized by a single-frequency system working in 0.14 THz and a THz time-domain spectroscopy (THz-TDS) system. The experimental results by the THz-TDS system show that the waveguide has two low-loss antiresonant windows (0.13–0.16 THz and 0.26–0.33 THz), which agree with the simulated results. The birefringence of the waveguide at 0.14 THz is 0.0038, and the transmission loss of the two polarizations is 0.17 and 0.165 dB/cm, respectively. Moreover, the waveguide achieves minimum experimental x-polarized losses of 0.077 dB/cm @0.29 THz and y-polarized losses of 0.073 dB/cm @0.29 THz. The polarization ratio of the waveguide measured by the single-frequency system also verified the polarization-maintaining ability, which changes from 96.81% to 96.46% after the 0.14 THz wave passes through the waveguide. This proves that our proposed waveguide can effectively transmit low-terahertz waves while maintaining the direction of incident linearly polarized waves.
{"title":"A Novel Polarization-Maintaining Antiresonant Waveguide for Low-Terahertz Transmission","authors":"Qiyuan Mu;Shijie Wang;Depeng Kong;Yuan Yuan;Zhen Liu","doi":"10.1109/TTHZ.2025.3534749","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3534749","url":null,"abstract":"In this article, a high birefringence and low loss polarization-maintaining terahertz waveguide based on the antiresonant mechanism is proposed, of which the cladding comprises six circular tubes and four curved thin walls. The thickness difference between the horizontal outer tubes and the vertical circular tubes brings a high birefringence, which can be further improved by the structural difference attributable to the nested tubes. Moreover, the nested tubes and four curved thin walls also reduce waveguide losses. The simulated results show that the birefringence of the designed waveguide at 0.14 THz is 0.00165, and the <italic>x</i>-polarized and <italic>y</i>-polarized loss is 0.096 dB/cm and 0.104 dB/cm, respectively. In addition, fabricated waveguides by three-dimensional printing technology are characterized by a single-frequency system working in 0.14 THz and a THz time-domain spectroscopy (THz-TDS) system. The experimental results by the THz-TDS system show that the waveguide has two low-loss antiresonant windows (0.13–0.16 THz and 0.26–0.33 THz), which agree with the simulated results. The birefringence of the waveguide at 0.14 THz is 0.0038, and the transmission loss of the two polarizations is 0.17 and 0.165 dB/cm, respectively. Moreover, the waveguide achieves minimum experimental <italic>x</i>-polarized losses of 0.077 dB/cm @0.29 THz and <italic>y</i>-polarized losses of 0.073 dB/cm @0.29 THz. The polarization ratio of the waveguide measured by the single-frequency system also verified the polarization-maintaining ability, which changes from 96.81% to 96.46% after the 0.14 THz wave passes through the waveguide. This proves that our proposed waveguide can effectively transmit low-terahertz waves while maintaining the direction of incident linearly polarized waves.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 2","pages":"250-259"},"PeriodicalIF":3.9,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-27DOI: 10.1109/TTHZ.2025.3534757
Changyun Yoo;Jeffrey L. Hesler;Boris S. Karasik
In this letter, we present high-performance terahertz (THz) metal-mesh bandpass filters developed to mitigate direct detection effects in sensitive THz receivers based on superconducting hot-electron bolometer (HEB) mixers. These metal-mesh filters are freestanding 5-μm-thick sheets of copper perforated with a periodic array of diamond-shaped apertures. The simple aperture design minimizes the effect of fabrication (rounding) errors on filter performance, allowing precise engineering of the center frequency (1.5–5.5 THz) while maintaining high (>90%) peak power transmission at normal incidence and a relatively narrow bandwidth of 5%–15%. Based on finite-element method simulation results, we provide simple design equations that can be used for rapid design with high accuracy. The measured transmission profiles of 1.9-, 2.5-, and 4.7-THz filters show excellent agreement with the simulation results. These filters are compatible with cryogenic operation and can substantially reduce the direct detection effects in HEB mixers.
{"title":"THz Metal-Mesh Bandpass Filters With Diamond-Shaped Apertures for Sensitive THz Receivers","authors":"Changyun Yoo;Jeffrey L. Hesler;Boris S. Karasik","doi":"10.1109/TTHZ.2025.3534757","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3534757","url":null,"abstract":"In this letter, we present high-performance terahertz (THz) metal-mesh bandpass filters developed to mitigate direct detection effects in sensitive THz receivers based on superconducting hot-electron bolometer (HEB) mixers. These metal-mesh filters are freestanding 5-μm-thick sheets of copper perforated with a periodic array of diamond-shaped apertures. The simple aperture design minimizes the effect of fabrication (rounding) errors on filter performance, allowing precise engineering of the center frequency (1.5–5.5 THz) while maintaining high (>90%) peak power transmission at normal incidence and a relatively narrow bandwidth of 5%–15%. Based on finite-element method simulation results, we provide simple design equations that can be used for rapid design with high accuracy. The measured transmission profiles of 1.9-, 2.5-, and 4.7-THz filters show excellent agreement with the simulation results. These filters are compatible with cryogenic operation and can substantially reduce the direct detection effects in HEB mixers.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 2","pages":"296-299"},"PeriodicalIF":3.9,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-20DOI: 10.1109/TTHZ.2025.3532157
Yue Liang;Jing Feng;Qin Chen;Xu Wu;Xiangning Fan;Lianming Li
This letter presents a 225-GHz coupled second harmonic oscillator. The single-ended oscillator core utilizes a piecewise linear model with a phase factor to analyze the impact of the large-signal fundamental ($bm {f}_{bm {0}}$) voltages on the second-harmonic ($bm {2f}_{bm {0}}$) current, enabling the selection of optimal transistor conditions for efficient $bm {f}_{bm {0}}$ oscillation and $bm {2f}_{bm {0}}$ generation. To achieve good phase noise and output power performance, the coupling scheme of eight oscillator cores is proposed without extra components to suppress unwanted modes. Fabricated in a 65-nm CMOS process, the coupled oscillator generates 0.407-mW output power while consuming 40.5 mW from a 0.75-V power supply voltage. The measured dc-to-RF efficiency of the oscillator is 1% and the phase noise is −88 dBc/Hz at 1 MHz offset, resulting in a figure of merit of −179 dBc/Hz.
{"title":"A 225-GHz Coupled Harmonic Oscillator With −179 dBc/Hz FoM in 65-nm CMOS","authors":"Yue Liang;Jing Feng;Qin Chen;Xu Wu;Xiangning Fan;Lianming Li","doi":"10.1109/TTHZ.2025.3532157","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3532157","url":null,"abstract":"This letter presents a 225-GHz coupled second harmonic oscillator. The single-ended oscillator core utilizes a piecewise linear model with a phase factor to analyze the impact of the large-signal fundamental (<inline-formula><tex-math>$bm {f}_{bm {0}}$</tex-math></inline-formula>) voltages on the second-harmonic (<inline-formula><tex-math>$bm {2f}_{bm {0}}$</tex-math></inline-formula>) current, enabling the selection of optimal transistor conditions for efficient <inline-formula><tex-math>$bm {f}_{bm {0}}$</tex-math></inline-formula> oscillation and <inline-formula><tex-math>$bm {2f}_{bm {0}}$</tex-math></inline-formula> generation. To achieve good phase noise and output power performance, the coupling scheme of eight oscillator cores is proposed without extra components to suppress unwanted modes. Fabricated in a 65-nm CMOS process, the coupled oscillator generates 0.407-mW output power while consuming 40.5 mW from a 0.75-V power supply voltage. The measured dc-to-RF efficiency of the oscillator is 1% and the phase noise is −88 dBc/Hz at 1 MHz offset, resulting in a figure of merit of −179 dBc/Hz.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 2","pages":"291-295"},"PeriodicalIF":3.9,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-07DOI: 10.1109/TTHZ.2024.3520370
{"title":"IEEE Microwave Theory and Techniques Society Information","authors":"","doi":"10.1109/TTHZ.2024.3520370","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3520370","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 1","pages":"C2-C2"},"PeriodicalIF":3.9,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10832399","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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