Article
Engineering, Electrical & Electronic
Adham Mahmoud, Jorge Ruiz-Garcia, Olivier de Sagazan, Mauro Ettorre, Ronan Sauleau, David Gonzalez-Ovejero
Summary: This article presents the use of a Luneburg lens to excite a leaky-wave antenna in the sub-THz frequency range. The antenna is fabricated on a 140-mu m thick cyclic Olefin copolymer substrate, with radiating slots etched on the polymer using photolithography. Experimental results show good input reflection coefficient and beam steering capability. The proposed solution offers a low-cost and low-profile alternative for beam-scanning antennas in the sub-THz range.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Chemistry, Analytical
Qiang Li, Bingyan Jiang, Xianglin Li, Mingyong Zhou
Summary: A solvent-assisted bonding strategy was proposed to improve the bonding quality and reduce the fabrication time of microfluidic chips. The results showed that mixing cyclohexane with isopropanol can reduce the dissolution effect. The optimal parameters for solvent treatment of the cover sheet were found to be a cyclohexane volume fraction of 70%, a dose of 1.5 mL, a bonding pressure of 2 MPa, and a bonding time of 240 s, resulting in a bonding strength of 913 kPa.
Article
Polymer Science
Eun Chae Kim, Myung-Jin Kim, Linh Nguyet Thi Ho, Woohwa Lee, Jae-Won Ka, Dong-Gyun Kim, Tae Joo Shin, Kang Moo Huh, Sungmin Park, Yong Seok Kim
Summary: The synthesis and systematic investigation of vinyl-addition polynorbornene copolymers with pendant n-alkyl chains were reported, with high transmittance films successfully prepared by a solution-casting method. The mechanical properties of the films can be controlled by tuning the length and content of the alkyl chain.
Article
Polymer Science
L. Etxeberria, J. Anakabe, L. Fernandez, A. Larranaga-Varga, J. L. Vilas-Vilela, L. Ruiz-Rubio, A. M. Zaldua
Summary: This study provides a detailed analysis of the crystallization behavior of semi-crystalline COC material. The results show that the crystalline structure generated during the injection molding of PoC device parts remains the same regardless of processing conditions. The study on the non-isothermal crystallization kinetics suggests that the Avrami-Ozawa and Avrami models are effective in describing the crystallization behavior of the material.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Chemistry, Analytical
Rodolfo G. Rodrigues, Pedro G. M. Condelipes, Rafaela R. Rosa, Virginia Chu, Joao Pedro Conde
Summary: The study developed a method to fabricate COC microfluidic structures and evaluated its material properties for application in microfluidics. The COC devices showed potential for use in biosensing and Lab-on-a-Chip applications.
Article
Engineering, Electrical & Electronic
Milan Salek, Stephen M. Hanham, Andrew P. Gregory
Summary: This letter presents the design, fabrication, and characterization of an air-mode 1-D photonic crystal resonator (PCR) operating at 100 GHz. The PCR was made of an inexpensive cyclic olefin copolymer (COC) using computer numerical control (CNC) milling. Despite the lack of complete electromagnetic bandgap due to the low permittivity of the COC, a resonator with a high quality factor (Q-factor) of 2800 was achieved by shaping the resonant field to minimize radiative loss.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Article
Computer Science, Interdisciplinary Applications
Shimin Zheng, Haidong Chen, Huibing Chen, Wenhai Zhang, Quan Xue, Wenquan Che
Summary: This article introduces a novel copper clad laminate based on COC material, investigates its loss characteristic, and designs baluns operating at X-band. Experimental results demonstrate good performance of the laminate, making it a promising candidate for microwave/millimeter wave circuit applications.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2022)
Article
Polymer Science
Zhihao Wang, Xin Shu, Hu Zhang, Lixin Cao, Yanqing Li, Zhengguo Cai
Summary: A series of 1,2-bis(imidazolidin-2-imine)benzene nickel complexes with different substituents were synthesized and characterized. The complexes showed tetrahedral configuration, with some exhibiting high steric hinderance and thermal stability. These nickel complexes were highly active for norbornene polymerization and copolymerization with styrene, forming uniform copolymers with tunable properties.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Engineering, Chemical
Gokce Kurt, Iclal Tuney, Alper Kasgoz
Summary: This study investigates the morphological, rheological, and dynamic mechanical properties of blends of cyclo-olefin copolymers (COC) and poly(Acrylonitrile-Butadiene-Styrene) (ABS) with different monomer compositions. The results show that the morphology of the blends varies with composition, and the addition of ABS increases the shear modulus and viscosity of the blends. Furthermore, the influence of ABS on the blends differs when using COC with different norbornene contents, with lower norbornene content COC being more compatible with ABS.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Meng Xiao, Kailun Fan, Mengdie Zhang, Boxue Du, Zhaoyu Ran, Zhaoliang Xing
Summary: In this study, the dielectric properties of polypropylene (PP) films were improved by blending with cyclic olefin copolymer (COC), which showed good interfacial compatibility. The blended PP/COC film exhibited enhanced dimensional stability and breakdown properties, making it a feasible idea to improve the high-temperature resistance of metalized film capacitors (MFCs).
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2022)
Article
Chemistry, Analytical
Yali Chen, Ling Xia, Xiaohua Xiao, Gongke Li
Summary: The study achieved rapid and effective quantitation of carnosine and nicotinamide in cosmetics by using cyclic olefin copolymer microchips with both dynamic and static coatings. The static coating improved the hydrophilicity of the surface and prevented nonspecific peptide adsorption, while the dynamic coating adjusted flow velocity and enhanced column efficiency. The method showed potential in complex sample analysis.
JOURNAL OF SEPARATION SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Elena Mavrona, Jil Graf, Erwin Hack, Peter Zolliker
Summary: This research optimized the 3D printing parameters for using cyclic olefin copolymer (TOPAS) to manufacture THz waveguides, demonstrating the importance of low-cost optical devices for THz applications. Transmission measurements validated the simulation results for core mode frequencies in the range of 250-900 GHz, showing the effectiveness of the optimized 3D printing parameters.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Energy & Fuels
Nevra Ercan, Ciler Kocyigit, Ali Durmus, Ahmet Kasgoz
Summary: Thermoplastic based mixed matrix membranes prepared using cyclic olefin copolymer (COC) and metal organic frameworks (MOFs) showed promising gas separation performance, especially in the case of H-2/CO2 separation compared to pure COC. Gas permeation models were effectively used to predict the increase in H-2 gas permeability. Loading MOFs significantly enhanced gas permeability and ideal selectivity.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Physical
Mingyuan Li, Zhengguo Cai, Moris S. Eisen
Summary: A new family of [N,N]-type bidentate aldimine imidazolidin-2-imine/guanidine ligands and their nickel complexes were synthesized and characterized. These nickel catalysts exhibited high activity for norbornene polymerization and copolymerization with 1-alkenes, producing various norbornene-based high-molecular-weight cyclic olefin copolymers. The nickel complexes also showed tolerance towards polar monomers, promoting the direct copolymerization of norbornene and methyl 10-undecenoate.
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Physical
K. Nikiforova, A. Gorbunova, E. Plotnikov, P. Postnikov, O. Guselnikova
Summary: Prefilled biomedical devices (PFD) are increasing in popularity in the pharmaceutical market due to their convenience in delivering accurate doses of protein drugs. Cyclic olefin copolymer (COC) is suggested as an alternative to fragile glass. The functionalization of COC with quaternary ammonium moieties (QAS) improves its surface properties, enhancing antibiofouling performance and stability.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Analytical
Chu-Tung Yeh, Devesh Barshilia, Chia-Jui Hsieh, Hsun-Yuan Li, Wen-Hsin Hsieh, Guo-En Chang
Summary: The proposed GMR optofluidic biosensing system offers a rapid, sensitive, and highly stable solution for POC applications, with self-compensation function reducing environmental instability and enhancing system performance over a long period. An outstanding limit of detection of 1.95 x 10(-8) g/mL was achieved for CRP detection, validating the effectiveness of the system for biochemical reaction detection.
Article
Engineering, Electrical & Electronic
Guo-En Chang, Shui-Qing Yu, Jifeng Liu, Hung-Hsiang Cheng, Richard A. Soref, Greg Sun
Summary: Ge1-xSnx photodetectors are a new type of mid-infrared CMOS-compatible detectors with good performance. The study shows that Ge1-xSnx PDs have high responsivity and detectivity in infrared detection due to improved optical absorption and electron-hole mobility and diffusion lengths.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Optics
Chen-Yang Chang, Po-Lun Yeh, Yue-Tong Jheng, Lung-Yi Hsu, Kuo-Chih Lee, Hui Li, H. H. Cheng, Guo-En Chang
Summary: Resonant electroluminescence from GeSn LEDs with a lateral p-i-n configuration on a silicon-on-insulator substrate was demonstrated at room temperature, showcasing efficient light emission in the mid-infrared spectrum. The results suggest potential for electrically injected GeSn light emitters operating at room temperature.
PHOTONICS RESEARCH
(2022)
Article
Optics
G. Sun, R. A. Soref, J. B. Khurgin, S-Q Yu, Guo-En Chang
Summary: This study proposes a lattice-matched Ge/GeSiSn quantum cascade detector capable of operating in the longwave infrared. The detector has a narrow spectral response and tunability, and can extend the optical response of photodetectors to longer wavelengths. It has potential applications in imaging, sensing, lidar, and space-and-fiber communications.
Article
Materials Science, Multidisciplinary
Shu An, Yi-Chiau Huang, Chen-Ying Wu, Po-Rei Huang, Guo-En Chang, Junyu Lai, Jung-Hun Seo, Munho Kim
Summary: GeSn/Si heterojunction photodiodes can be realized by transferring Si nanomembranes onto GeSn/Ge/Si substrates, which extends the wavelength range of light detection. This technique offers low dark current density and high responsivity.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Ziyihui Wang, Guocheng Fang, Zehang Gao, Yikai Liao, Chaoyang Gong, Munho Kim, Guo-En Chang, Shilun Feng, Tianhua Xu, Tiegen Liu, Yu-Cheng Chen
Summary: Self-propelled micro/nanomotors are used as intelligent sensors for analyzing extracellular biomarkers. A strategy is introduced to amplify subtle signals by coupling strong light-matter interactions on micromotors. A smart whispering-gallery-mode microlaser is demonstrated to analyze extracellular biomarkers in complex environments, providing exclusive molecular labels for cellular profiling of exosomes derived from 3D multicellular cancer spheroids. The proposed autonomous microlaser exhibits promising applications in drug screening, phenotyping, and organ-on-chip applications.
Article
Optics
Grey Abernathy, Solomon Ojo, Hryhorii Stanchu, Yiyin Zhou, Oluwatobi Olorunsola, Joshua Grant, Wei Du, Yue-Tong Jheng, Guo-En Chang, Baohua Li, Shui-qing Yu
Summary: The study focuses on SiGeSn lasers, which have opened up new possibilities for Si-based light sources. SiGeSn heterostructure and quantum well lasers have been successfully demonstrated in recent years. The research shows that adding a cap layer can improve the optical confinement factor of Fabry-Perot cavity lasers. SiGeSn/GeSn multiple quantum well devices with different cap layer thicknesses were grown, and the performance of these devices was characterized. The results provide guidance for the design of electrically injected SiGeSn quantum well lasers.
Article
Optics
Kuo-Chih Lee, Yu-Hsien Chuang, Chen-Kai Huang, Hui Li, Guo-En Chang, Kuan-Ming Hung, Hung Hsiang Cheng
Summary: Graphene-on-silicon photodetectors with a thin oxide layer exhibit p-type characteristics and have high responsivities, surpassing those of pure graphene or Si detectors. The p-type carrier concentration dominates the photocurrent, and photocurrent tunability is achieved through back-gated biasing. Gate amplification produces a current equal to the photogating current at a low bias, and photocurrent attenuation enables adjustments in detector output. This study establishes a model for gate-dependent currents and highlights the potential of gate-tunable photodetectors in high-performance optoelectronics.
Article
Chemistry, Analytical
Guo-En Chang, Shui-Qing Yu, Greg Sun
Summary: This study develops theoretical models to establish a simple rule (GeSn-rule 23) for describing the dark current density of GeSn photodetectors in terms of operation temperature, cutoff wavelength, and Sn composition. The study also finds that the performance of GeSn photodetectors, including responsivity, detectivity, and bandwidth, is highly dependent on the operation temperature.
Article
Nanoscience & Nanotechnology
Po-Lun Yeh, Bo-Rui Wu, Yi-Wei Peng, Chen-Wei Wu, Yue-Tong Jheng, Kwang Hong Lee, Qimiao Chen, Chuan Seng Tan, Guo-En Chang
Summary: This study demonstrates the first room-temperature electrically-injected Ge waveguide light emitters on a Ge-on-insulators (GOIs) platform, which have potential applications in electronic-photonic integrated circuits (EPICs). The device utilizes a high-quality Ge active layer transferred onto an insulator layer with eliminated misfit dislocations, introducing a 0.165% tensile strain to improve light emission efficiency. The improved electroluminescence at telecommunications wavelengths is achieved through a waveguide structure with enhanced optical confinement and a lateral p-i-n homojunction structure for electrical injection. The results pave the way for developing efficient, room-temperature, electrically-injected light emitters for next-generation GOI-based EPICs.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yeh-Chen Tai, Shu An, Po-Rei Huang, Yue-Tong Jheng, Kuo-Chih Lee, Hung-Hsiang Cheng, Munho Kim, Guo-En Chang
Summary: For the first time, transfer-printing techniques were used to create a cost-effective, nontoxic GeSn MIR resonant-cavity-enhanced flexible photodetector. By introducing tensile strain, the band structure of the GeSn nanomembrane active layer was effectively modulated, extending the photodetection range in the mid-infrared region and significantly enhancing the optical responsivity.
Article
Materials Science, Multidisciplinary
You Jin Kim, Shu An, Yikai Liao, Po-Rei Huang, Bongkwon Son, Chuan Seng Tan, Guo-En Chang, Munho Kim
Summary: In this study, a new scheme is developed to enhance the responsivity of Ge photodetectors (PDs) by integrating TiN and Ge on flexible platforms. The responsivity is boosted using TiN as a responsivity booster, showing a 63% improvement compared to flat Ge PDs. Moreover, a further increase in responsivity is achieved by applying tensile strain in the active region, reaching a responsivity of 11.5 mA W-1 at 1.55 μm. This work provides an efficient way to enhance the responsivity of flexible Ge PDs via heterogeneous integration of dissimilar materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Analytical
Devesh Barshilia, Akhil Chandrakanth Komaram, Pin-Chuan Chen, Lai-Kwan Chau, Guo-En Chang
Summary: A cost-effective, label-free, real-time, and sensitive slab waveguide-based particle plasmon resonance (WGPPR) biosensor was demonstrated for practical clinical applications. The sensor utilizes gold nanoparticles deposited on the waveguide layer to enhance the optical near field and enable sensitive and real-time detection. It offers a simple structure, high sensitivity, and rapid bio-sensing functionality.
Article
Engineering, Electrical & Electronic
Shu An, Shaoteng Wu, Kwang-Hong Lee, Chuan Seng Tan, Yeh-Chen Tai, Guo-En Chang, Munho Kim
Summary: Flexible germanium vertical p-i-n photodetectors with a resonant cavity structure were successfully fabricated by directly flip transferring Ge nanomembranes onto PET substrates. The devices exhibited excellent optoelectronic performance and mechanical durability, showcasing significant advances in the field of group IV NIR optoelectronic devices.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yun-Da Hsieh, Jun-Han Lin, Richard Soref, Greg Sun, Hung-Hsiang Cheng, Guo-En Chang
Summary: Tunable mid-infrared electro-absorption modulation is achieved in GeSn alloys on silicon, enabling the potential of electronic-photonic integrated circuits.
COMMUNICATIONS MATERIALS
(2021)
