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We have demonstrated packaging of a silicon photonic chip with polymer multimode waveguides on a package substrate in a face-up electro-optic 3D integration scheme. The optical loss at the die-to-package interface in O-band was measured to be 7.6dB, which agrees well with simulation.
We report on the experimental and theoretical investigation of a new class of terahertz filters based on frequency-selective surfaces patterned on thin foils of the low-loss cyclo-olef n polymer Zeonor. We observe both broad and narrowband resonances, which stem from the FSS response and the coupling to substrate guided modes, respectively. The filtering properties are studied as a function of the...
A low-cost, easy-to-fabricate paper-based capacitance sensor with inkjet printed interdigitated electrodes is presented. The sensor enables measurements of the dielectric properties of electrode free polymer films, a quick technique for assessing the insulating quality of polymer sheets. We demonstrate the suitability of the sensor for moisture and vapor measurements, permitting direct operation of...
Biomimetics is an engineering activity which aims to convert principles of biological function into human technology. A bio-device using information transfer-conversion system of the creature is a biosensor. Organic materials are quite fascinating due to availability of many metastable states which is considered to play a pivotal role for the next-generation electronics. Especially, “Organic lontronics”...
In the joint project SMARTHERM the applicability of vertically-aligned carbon nanotubes (VA CNT) is main subject of interest. Target is the implementation of a VACNT layer as functional thermal interface material into an RF package to prove this promising technology's feasibility. This paper presents the approach the SMARTHERM consortium has taken so far. Beginning with a general motivation why to...
We have developed highly transparent color liquid crystal display (LCD) using newly developed scattering-type liquid crystal, which shows transparent state when voltage is not applied, with field sequential color (FSC) driving method without employing color filter and polarizer. Furthermore the light is directly introduced to the panel glass substrates from the edge of the substrates (not from back...
The characteristics of polymer photodetectors based on a blend of a donor, poly(3-hexylthiophene) (P3HT), and an acceptor, fullerene derivative [6-6]phenyl-C61-butyric acid methyl ester (PCBM) using Ga-doped ZnO (GZO) electrodes modified by phosphonic acid-based self-assembled monolayer treatment in a short time are investigated. The characteristics of the conventional device with GZO modified by...
Flexible ITO-lree P3HT:PC61BM solar cells with spin-coated silver nanowire transparent electrode are demonstrated. For conventional structure type of solar cells, the power conversion efficiency (PCE) of devices based on silver nanowire can reach around 2.29%. As for inverted structure type, the PCE of devices can reach 3.39%. The conventional and inverted flexible ITO based P3HT:PC61BM solar cells...
Ultra-thin flexible glass provides all the benefits of glass — thermo-mechanical stability at high temperature, transparency and the best barrier property in a transparent material, while capable of using R2R processing and deliver products that can be flexible. Corning® Willow® Glass is 100–200 μm thick glass that is flexible and is used in a roll-to-roll (R2R) process. In this paper we will discuss...
We have demonstrated a new composite thin film for encapsulation consisting of polydimethylsiloxane (PDMS) and graphene. Graphene is a kind of hydrophobic material, causing that moisture could hardly penetrate into the surface of graphene. Graphene is usually fabricated by the method of Chemical Vapor Deposition (CVD). The atomic distance of graphene is very small; thus the water vapor channel from...
Hybrid integration of GaN and Si photonic devices is promising. Using a polymer bonding technique, GaN microring resonators are fabricated on Si substrate. Transmission characteristics of the GaN microring is measured.
We present a novel composite comprised of piezoelectric PMN-PT nanoparticles embedded in a SU8 polymer matrix that can be spin coated on any substrate to realize acoustic resonators and transducers. High Overtone Bulk Acoustic Resonators (HBARs) are fabricated using this novel composite on a low acoustic loss silicon substrate. Initial experimental results yield piezoelectric coefficient (d33) as...
Chitosan polymer matrix film is prepared from a mixed solution of chitosan and silver nitrate by drop-casting at different surfaces. The film shows various advantages for handling such as flexibility and mechanical strength. UV-Vis, FTIR, SEM and XRD analysis confirms the reduction of silver nitrate to form silver nanoparticles (AgNPs) and its in-situ growth of the silver nanowires (AgNWs) in the...
Stem cells are a promising tool for regenerative medicine and in the study of new therapies based on their secreted products, which modulate the immune system response and help tissue repair. The research on human patients in this field is slowed down by the limited availability of human stem cells, since the expansion of those cells is usually performed with exogenous substances or with the use of...
This paper presents the methodology for realisation of stretchable interconnects based on hybrid thin film stack of spray-coated conductive polymer PEDOT: PSS and evaporated gold (Au) film. The PEDOT: PSS film, with its properties in electrical conductivity and mechanical softness, serves as a stress release buffer in the layered hybrid structure. With the serpentine-shape design, the stretchable...
Isotropic conductive adhesives (ICAs) based on metal-coated polymer spheres (MPS) have shown high potential for low-temperature, high-throughput assembly of a transducer array on a substrate in ultrasound imaging applications. The process of bonding and subsequently dicing a transducer stack on a flexible substrate was evaluated. The bonding material was MPS-based ICAs containing a commercial epoxy...
In this study, novel flexible organic light-emitting diode structure (f-OLED) hybrimer/polymer/metal/polymer/emissive layer/metal was proposed. We studied the effect of the mechanical bending on its electro-optical behavior. The device contains polymeric based anode PEDOT:PSS/Au/PEDOT:PSS, where the conductive polymer was spray deposited on preliminary UV exposed hybrimer surface. It was found enhancement...
The interest in wearable electronics has been rapidly increasing due to the high demands for various wearable devices such as smart glasses and smart watches which satisfy the needs of today's customers. Future wearable devices will require fully flexible chip packaging performance and also maintain stable electrical performance under repeatedly bending environment. To meet these requirements, ultra-thin...
The polymer cored solder interconnect has been investigated in board level strain concerned ball grid array type IC package for many years. The novel solder ball with a polymer core is designed to compensate the board level reliability weakness of current metal alloy interconnect such as mechanical and thermal-mechanical fatigue endurance due to its unique spherical polymeric core able to absorb the...
Emerging high-performance computing systems have been aggressively driving advances in packaging technologies to meet their escalating performance and miniaturization needs. Large, high-density 2.5D silicon interposers have gained momentum with the recent split-die trend but face critical reliability challenges at board-level that are addressed by introducing an additional organic BGA package between...
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