scholarly journals High Sensitivity Terahertz Detection through Large-Area Plasmonic Nano-Antenna Arrays

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Nezih Tolga Yardimci ◽  
Mona Jarrahi
Keyword(s):  
Antenna Arrays ◽  
High Sensitivity ◽  
Large Area ◽  
Terahertz Detection

Terahertz Detection Using Large-Area Plasmonic Nano-Antenna Arrays Based on Stepped Strips

Optik ◽  
2021 ◽  
Vol 228 ◽  
pp. 165886
Author(s):  
Abdulrahman Mesgin Balow ◽  
Mehdi Khatir ◽  
Nasrin Amiri
Keyword(s):  
Antenna Arrays ◽  
Large Area ◽  
Terahertz Detection

scholarly journals Design of a Sensitive Balloon Sensor for Safe Human–Robot Interaction

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 2163
Author(s):  
Dongjin Kim ◽  
Seungyong Han ◽  
Taewi Kim ◽  
Changhwan Kim ◽  
Doohoe Lee ◽  
...  
Keyword(s):  
High Performance ◽  
Strain Sensor ◽  
High Sensitivity ◽  
Human Robot Interaction ◽  
Large Area ◽  
Tactile Sensors ◽  
Robot Interaction ◽  
Mechanical Crack ◽  
Flexible Strain Sensor ◽  
Contact Sensing

As the safety of a human body is the main priority while interacting with robots, the field of tactile sensors has expanded for acquiring tactile information and ensuring safe human–robot interaction (HRI). Existing lightweight and thin tactile sensors exhibit high performance in detecting their surroundings. However, unexpected collisions caused by malfunctions or sudden external collisions can still cause injuries to rigid robots with thin tactile sensors. In this study, we present a sensitive balloon sensor for contact sensing and alleviating physical collisions over a large area of rigid robots. The balloon sensor is a pressure sensor composed of an inflatable body of low-density polyethylene (LDPE), and a highly sensitive and flexible strain sensor laminated onto it. The mechanical crack-based strain sensor with high sensitivity enables the detection of extremely small changes in the strain of the balloon. Adjusting the geometric parameters of the balloon allows for a large and easily customizable sensing area. The weight of the balloon sensor was approximately 2 g. The sensor is employed with a servo motor and detects a finger or a sheet of rolled paper gently touching it, without being damaged.

scholarly journals Effects of Crystal Morphology on the Hot-Carrier Dynamics in Mixed-Cation Hybrid Lead Halide Perovskites

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 708
Author(s):  
Daniele Catone ◽  
Giuseppe Ammirati ◽  
Patrick O’Keeffe ◽  
Faustino Martelli ◽  
Lorenzo Di Mario ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Carrier Dynamics ◽  
Large Area ◽  
Photovoltaic Properties ◽  
Time Resolved ◽  
Hot Carrier ◽  
Mixed Cation ◽  
Small Crystals ◽  
Characterization Of Materials ◽  
Lead Halide

Ultrafast pump-probe spectroscopies have proved to be an important tool for the investigation of charge carriers dynamics in perovskite materials providing crucial information on the dynamics of the excited carriers, and fundamental in the development of new devices with tailored photovoltaic properties. Fast transient absorbance spectroscopy on mixed-cation hybrid lead halide perovskite samples was used to investigate how the dimensions and the morphology of the perovskite crystals embedded in the capping (large crystals) and mesoporous (small crystals) layers affect the hot-carrier dynamics in the first hundreds of femtoseconds as a function of the excitation energy. The comparative study between samples with perovskite deposited on substrates with and without the mesoporous layer has shown how the small crystals preserve the temperature of the carriers for a longer period after the excitation than the large crystals. This study showed how the high sensitivity of the time-resolved spectroscopies in discriminating the transient response due to the different morphology of the crystals embedded in the layers of the same sample can be applied in the general characterization of materials to be used in solar cell devices and large area modules, providing further and valuable information for the optimization and enhancement of stability and efficiency in the power conversion of new perovskite-based devices.

scholarly journals High-Sensitivity Large-Area Photodiode Read-Out Using a Divide-and-Conquer Technique

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6316
Author(s):  
Guillermo Royo ◽  
Carlos Sánchez-Azqueta ◽  
Concepción Aldea ◽  
Santiago Celma
Keyword(s):  
Traditional Approach ◽  
Signal To Noise Ratio ◽  
High Sensitivity ◽  
Divide And Conquer ◽  
Transimpedance Amplifier ◽  
Large Area ◽  
Signal To Noise ◽  
Remarkable Improvement ◽  
The Core ◽  
Novel Technique

In this letter, we present a novel technique to increase the sensitivity of optical read-out with large integrated photodiodes (PD). It consists of manufacturing the PD in several pieces, instead of a single device, and connecting a dedicated transimpedance amplifier (TIA) to each of these pieces. The output signals of the TIAs are combined, achieving a higher signal-to-noise ratio than with the traditional approach. This work shows a remarkable improvement in the sensitivity and transimpedance without the need for additional modifications or compensation techniques. As a result, an increase in sensitivity of 7.9 dBm and transimpedance of 8.7 dBΩ for the same bandwidth is achieved when dividing the photodiode read-out into 16 parallel paths. The proposed divide-and-conquer technique can be applied to any TIA design, and it is also independent of the core amplifier structure and fabrication process, which means it is compatible with every technology allowing the integration of PDs.

scholarly journals Locally Controlled Sensing Properties of Stretchable Pressure Sensors Enabled by Micro-Patterned Piezoresistive Device Architecture

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6588
Author(s):  
Jun Ho Lee ◽  
Jae Sang Heo ◽  
Keon Woo Lee ◽  
Jae Cheol Shin ◽  
Jeong-Wan Jo ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Silver Nanowires ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Fast Response ◽  
Large Area ◽  
Site Specific ◽  
Sensing Properties ◽  
Sensing Range ◽  
Wide Range

For wearable health monitoring systems and soft robotics, stretchable/flexible pressure sensors have continuously drawn attention owing to a wide range of potential applications such as the detection of human physiological and activity signals, and electronic skin (e-skin). Here, we demonstrated a highly stretchable pressure sensor using silver nanowires (AgNWs) and photo-patternable polyurethane acrylate (PUA). In particular, the characteristics of the pressure sensors could be moderately controlled through a micro-patterned hole structure in the PUA spacer and size-designs of the patterned hole area. With the structural-tuning strategies, adequate control of the site-specific sensitivity in the range of 47~83 kPa−1 and in the sensing range from 0.1 to 20 kPa was achieved. Moreover, stacked AgNW/PUA/AgNW (APA) structural designed pressure sensors with mixed hole sizes of 10/200 µm and spacer thickness of 800 µm exhibited high sensitivity (~171.5 kPa−1) in the pressure sensing range of 0~20 kPa, fast response (100~110 ms), and high stretchability (40%). From the results, we envision that the effective structural-tuning strategy capable of controlling the sensing properties of the APA pressure sensor would be employed in a large-area stretchable pressure sensor system, which needs site-specific sensing properties, providing monolithic implementation by simply arranging appropriate micro-patterned hole architectures.

scholarly journals The Science Case for PILOT II: the Distant Universe

2009 ◽  
Vol 26 (4) ◽  
pp. 397-414 ◽  
Author(s):  
J. S. Lawrence ◽  
M. C. B. Ashley ◽  
A. Bunker ◽  
R. Bouwens ◽  
D. Burgarella ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Redshift ◽  
High Sensitivity ◽  
Infrared Light ◽  
Wide Field ◽  
Atmospheric Conditions ◽  
Large Area ◽  
Optical Telescope ◽  
Infrared Telescope ◽  
Scientific Potential

AbstractPILOT (the Pathfinder for an International Large Optical Telescope) is a proposed 2.5-m optical/infrared telescope to be located at Dome C on the Antarctic plateau. The atmospheric conditions at Dome C deliver a high sensitivity, high photometric precision, wide-field, high spatial resolution, and high-cadence imaging capability to the PILOT telescope. These capabilities enable a unique scientific potential for PILOT, which is addressed in this series of papers. The current paper presents a series of projects dealing with the distant (redshift >1) Universe, that have been identified as key science drivers for the PILOT facility. The potential for PILOT to detect the first populations of stars to form in the early Universe, via infrared projects searching for pair-instability supernovae and gamma-ray burst afterglows, is investigated. Two projects are proposed to examine the assembly and evolution of structure in the Universe: an infrared survey searching for the first evolved galaxies at high redshift, and an optical survey aimed at characterising moderate-redshift galaxy clusters. Finally, a large-area weak-lensing survey and a program to obtain supernova infrared light-curves are proposed to examine the nature and evolution of dark energy and dark matter.

scholarly journals Advances in the fabrication of graphene transistors on flexible substrates

2017 ◽  
Vol 8 ◽  
pp. 467-474 ◽  
Author(s):  
Gabriele Fisichella ◽  
Stella Lo Verso ◽  
Silvestra Di Marco ◽  
Vincenzo Vinciguerra ◽  
Emanuela Schilirò ◽  
...  
Keyword(s):  
Field Effect ◽  
Field Effect Transistors ◽  
High Mobility ◽  
High Sensitivity ◽  
Atomic Layer ◽  
Transparent Electrode ◽  
Large Area ◽  
Sensing Applications ◽  
Dielectric Performance

Graphene is an ideal candidate for next generation applications as a transparent electrode for electronics on plastic due to its flexibility and the conservation of electrical properties upon deformation. More importantly, its field-effect tunable carrier density, high mobility and saturation velocity make it an appealing choice as a channel material for field-effect transistors (FETs) for several potential applications. As an example, properly designed and scaled graphene FETs (Gr-FETs) can be used for flexible high frequency (RF) electronics or for high sensitivity chemical sensors. Miniaturized and flexible Gr-FET sensors would be highly advantageous for current sensors technology for in vivo and in situ applications. In this paper, we report a wafer-scale processing strategy to fabricate arrays of back-gated Gr-FETs on poly(ethylene naphthalate) (PEN) substrates. These devices present a large-area graphene channel fully exposed to the external environment, in order to be suitable for sensing applications, and the channel conductivity is efficiently modulated by a buried gate contact under a thin Al2O3 insulating film. In order to be compatible with the use of the PEN substrate, optimized deposition conditions of the Al2O3 film by plasma-enhanced atomic layer deposition (PE-ALD) at a low temperature (100 °C) have been developed without any relevant degradation of the final dielectric performance.

Large-area photodetector with high-sensitivity and broadband spectral response based on composition-graded CdSSe nanowire-chip

2015 ◽  
Vol 649 ◽  
pp. 793-800 ◽  
Author(s):  
Shuai Guo ◽  
Zhishuang Li ◽  
Guangli Song ◽  
Bingsuo Zou ◽  
Xiaoxu Wang ◽  
...  
Keyword(s):  
Spectral Response ◽  
High Sensitivity ◽  
Large Area

Coherent terahertz detection with a large-area photoconductive antenna

2007 ◽  
Vol 91 (8) ◽  
pp. 081109 ◽  
Author(s):  
F. Peter ◽  
S. Winnerl ◽  
S. Nitsche ◽  
A. Dreyhaupt ◽  
H. Schneider ◽  
...  
Keyword(s):  
Photoconductive Antenna ◽  
Large Area ◽  
Terahertz Detection
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