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Triple-Junction Optoelectronic Sensor with Nanophotonic Layer Integration for Single Molecule Level Decoding
摘要： Interest in developing a rapid and robust DNA sequencing platform has surged over the past decade. Various next-/third-generation sequencing mechanisms have been employed to replace the traditional Sanger sequencing method. In sequencing by synthesis (SBS), a signal is monitored by a scanning charge-coupled device (CCD) to identify thousands to millions of incorporated dNTPs with distinctive fluorophores on a chip. Because one reaction site usually occupies dozens of pixels on a CCD detector, a bottleneck related to the bandwidth of CCD imaging limits the throughputs of the sequencing performance and causes tradeoffs among speed, accuracy, read length, and the numbers of reaction sites in parallel. Thus, current research aims to align one reaction site to a few pixels by directly stacking nanophotonic layers (NPLs) onto a CMOS detector to minimize the size of the sequencing platforms and accelerate the processing procedures. This article reports a custom integrated optoelectronic device based on a triple-junction photodiode (TPD) CMOS sensor in conjunction with NPL integration for real-time illumination and detection of fluorescent molecules.
关键词： planar waveguide,nanophotonic layer,CMOS,triple-junction photodiode (TPD),filter,grating
更新于2025-11-25 10:30:42
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Investigation of sol-gel and nanoparticle-based NiOx hole transporting layer for high-performance planar perovskite solar cells
摘要： We conduct a comprehensive study on and comparison of sol-gel and nanoparticles (NPs)-based nickel oxide hole-transporting layer (HTL) for high-performance planar perovskite solar cells (PSCs). The characteristics and film properties of sol-gel and NPs were systemically investigated using ultraviolet photoelectron spectroscopy (UPS), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and photoluminescence (PL), and its effect on device-performance was also examined using J-V characteristics, quantum-efficiency, and the VOC dependence of the light intensity. Through this comparison of two types of HTL and their device-performances, these studies can provide sufficient and robust information for nickel oxide-based PSCs, and furthermore, the overall results and discussions can be useful for high-performance PSCs.
关键词： Nickel oxide,Planar perovskite solar cells,Hole transporting layer,Sol-gel,Nanoparticles
更新于2025-11-19 16:46:39
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Control of Circularly Polarized Luminescence by Orientation of Stacked π-Electron Systems
摘要： New planar chiral building blocks based on 4,7,12,15-tetrasubstituted [2.2]paracyclophanes were obtained via a synthetic route involving an optical resolution step. Planar chiral enantiomers, comprising of two fluorophores that were stacked to form a V-shaped higher-ordered structure, were synthesized from these building blocks. The V-shaped molecules emitted intense circularly polarized luminescence (CPL). Their chiroptical properties were compared with those of X-shaped molecules bearing the same two fluorophores stacked together. CPL sign of the X-shaped molecule was opposite to that of the V-shaped molecule, which is supported by the theoretical results, indicating that CPL sign can be controlled by the orientation of the stacked fluorophores.
关键词： circularly polarized luminescence,planar chirality,higher-ordered structure,[2.2]paracyclophane
更新于2025-09-23 15:23:52
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Micro Grating Deposition on Non-Planar Surfaces by Polymer-Assisted Transfer Printing
摘要： By spin-coating a few hundred of nanometer thick poly(methyl methacrylate) (PMMA) film on a micron or a sub-micron scale structure, the structure can be transferred on an arbitrary substrate. More precisely, by using a thin PMMA support layer and releasing the structure from the transient substrate into water, the PMMA with the structure can be collected on a desired substrate. Here, this technique is demonstrated to be suitable for transferring metallic binary grating and few-layer Bragg gratings from flat substrates onto 3D-printed convex lenses. Moreover, the thin PMMA film is sufficiently strong to support centimeter size free-standing areas. This enables fabrication of 1.5 μm thick, free-standing structure of a Bragg-grating with PMMA. Thus, the presented technique provides a powerful tool for transfer printing of micron scale structures.
关键词： transfer printing,non-planar surfaces,free-standing structures,microstructure transfer
更新于2025-09-23 15:23:52
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TFET performance optimization using gate work function engineering
摘要： This work presents main electrical characteristics improvement in a nanoscale tunnel ?eld-effect transistor (TFET) with 50 nm channel length, applying work function engineering techniques. Three different metal gate materials with dedicated work functions are utilized to optimize the TFET performance. By gate work function and length optimization, the main parameters of Ion = 5910-5 A/lm, Ioff = 2.5 9 10-15 A/lm, Iamb = 3910-7 A/lm, and subthreshold swing = 51.01 mV/decade are obtained in accordance with tunneling barrier shape at source/channel and drain/channel junctions. The work function engineering techniques, presented in the current work, results in 1.22 times improvement in ION and 0.99 times improvement in IOFF.
关键词： Planar triple metal gate,TFET,Work function engineering
更新于2025-09-23 15:23:52
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Adaptation of Babinet's Principle for Complementary Antennas in a Dielectric Half-Space
摘要： Babinet’s Principle is widely known to relate the impedances of complementary structures. However, the usefulness of the principle is fundamentally limited by the requirement that the complementary structures be in homogeneous media - preventing its use for modern printed circuit board style constructed antennas with a dielectric backing. This letter shows a modification of Babinet’s Principle to describe the impedance relationship of complementary structures in a dielectric half-space - providing a deeper theoretical understanding of complementary structure behavior. This provides a first step toward an analytical solution for Babinet’s Principle applied to finite dielectric backings.
关键词： planar antennas,Babinet’s Principle,dipole,slot antenna
更新于2025-09-23 15:23:52
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Planar UWB Monopole Antenna with Tri-Band Rejection Characteristics at 3.5/5.5/8 GHz
摘要： A triple band-notched ultrawide band (UWB) antenna is presented to avoid the interference of services working in the UWB band, such as WLAN, WiMAX and X-band satellite systems. The arc H-shaped slot on the radiating patch creates a low frequency notched band, while the other two band-notched bands are formed by cutting narrow slots on the ground plane. The presented antenna can operate on the ultrawide band efficiently and inhibit interference from three different kinds of narrow band communication systems. The simulation and measurement results show that the antenna has excellent band-notched function on the rejectband and almost omnidirectional radiation pattern on the passband.
关键词： planar monopole antenna,slots,triple band-notched,ultrawide band (UWB) antenna
更新于2025-09-23 15:23:52
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Electromagnetic behavior of a non-integer dimensional planar interface located in chiral medium
摘要： Purpose of the present study is to investigate the reflection and transmission characteristics of a non-integer dimensional (NID) planar interface located in an unbounded homogeneous chiral medium. The medium is NID in direction normal to the interface and a parameter, called NID parameter, is used to model the NID characteristics of the medium. Interface exists due to unequal value of the NID parameters characterizing mediums lying on two sides of the interface. It is observed co and cross-components of reflected field have very significant effect of NID parameters. Special cases in which one and neither of the NID parameter is integer order have also been discussed.
关键词： Planar interface and fractal medium,Non-integer dimensional space,Chiral medium
更新于2025-09-23 15:23:52
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A Novel Miniaturized Planar Ultra-Wideband Antenna
摘要： A novel miniaturized planar ultra-wideband antenna is proposed. The antenna design comprises an electromagnetically coupled structure and a tapered radiating slot, while a triangular slot is etched on the ground plane. The antenna miniaturization is realized by adopting an electromagnetically coupled structure formed by the notched half-ellipse patch and the strip attached to the ground. The proposed antenna can yield a large 10-dB impedance bandwidth ranging from 1.5 to 10.4 GHz with satisfactory radiation properties. It also features a physical size of 37.4 mm × 64 mm, equivalent to a compact electrical size of 0.19λ × 0.32λ at 1.5 GHz. The important design parameters are analyzed to comprehend the operating principle of the antenna. A good agreement between the simulated and measured results is achieved.
关键词： compact antenna,Ultra-wideband antenna,planar antenna,antenna miniaturization
更新于2025-09-23 15:23:52
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Optically reconfigurable planar monopole antenna for cognitive radio application
摘要： Frequency reconfigurable antenna is one of the important elements needed for cognitive radio application. Such antenna can be designed using highly resistive (HR) silicon (Si) operating as an optical switch. This letter presents a novel frequency reconfigurable planar monopole antenna suitable for cognitive radio application. The antenna is designed using HR Si working as an optical switch. The main idea behind the design of antenna is the redistribution of surface current on the antenna while changing the state of Si switches optically from high resistance to low resistance. The antenna is highly compact and uses only two switches for multiband reconfiguration. It is switchable on 1.9 GHz, 2.75 GHz, 3.7 GHz, 4.1 GHz, 4.6 GHz, 4.8 GHz, and 7.6 to 11 GHz frequency bands. Simulated and measured results are presented for the antenna. To the best of authors knowledge, this is the first multiband optically reconfigurable planar monopole antenna.
关键词： high-resistive (HR) silicon,optical excitation,low-resistive (LR) silicon,planar monopole antenna,cognitive radio,reconfigurable,multiband
更新于2025-09-23 15:22:29