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Nano@Tech Lecture Series

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Now showing 1 - 10 of 132
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    Advancements in Photonics for Radio Frequency Electronics Systems
    (Georgia Institute of Technology, 2019-12-10) Yang, Benjamin
    The application of photonics for the processing of radio frequency (RF) systems offer many potential advantages, such as low signal transport loss, large operating bandwidth, and potentially low size, weight, and power (SWaP) form factors. While investments from the telecommunications industry have matured the basic building blocks in radio frequency photonics and photonic integrated circuit technology, insertion of these advances into modern radio frequency systems requires solving additional unique challenges. The Georgia Tech Research Institute’s (GTRI) photonics team is researching solutions to successfully insert RF photonics in fielded electronic systems and broaden the technology impact beyond telecommunications. This seminar will cover three objectives: 1) introduce the Institute for Electronics and Nanotechnology (IEN) community to GTRI and select topics of its photonics research portfolio; 2) examine advantages and challenges of both discrete and integrated photonics from an RF electronic systems perspective; 3) survey architectures, systems, and components under collaborative development between the Georgia Tech Research Institute, Georgia Tech Electrical and Computer Engineering, and external partners. We will conclude by discussing capabilities under development that can expand IEN’s competencies and explore paths toward broader collaboration across Georgia Tech.
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    Atmospheric Organic Aerosols: Sources, Chemistry, and Health Impacts
    (Georgia Institute of Technology, 2019-11-26) Ng, Nga Lee
    Organic aerosols constitute a significant fraction of submicron fine particulate matter (PM) in the atmosphere. Secondary organic aerosols (SOA) formed from condensation of low-volatility species produced by oxidation of gas-phase organic compounds often dominate the mass of atmospheric organic aerosols. Understanding the formation of SOA has proven to be a challenge owing to the difficulty in identifying and quantifying all the gas-phase precursors as well as the complex, multi-generation oxidative chemistry that leads to the aerosol formation. Laboratory chamber experiments provide the basic understanding needed for predicting SOA formation. Ambient field measurements provide important datasets for understanding the chemistry and life cycles of atmospheric aerosols. In this work, we employed an integrated laboratory and field measurement approach to investigate how emissions from human activities (e.g., SO2, NOx) interact with emissions from trees in the formation of SOA. We will also discuss oxidative stress induced by laboratory and ambient aerosols for understanding their impacts on human health upon exposure.
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    Semiconductor Nanomaterials for Transient Electronics
    (Georgia Institute of Technology, 2019-10-22) Rogers, John A.
    A remarkable feature of modern integrated circuit technology is its ability to operate in a stable fashion, with almost perfect reliability, without physical or chemical change. Recently developed classes of electronic materials create an opportunity to engineer the opposite outcome, in the form of ‘transient’ devices that dissolve, disintegrate or otherwise disappear at triggered times or with controlled rates. Water-soluble transient electronics serve as the foundations for interesting applications in zero-impact environmental monitors, 'green' consumer electronics and bio-resorbable biomedical implants. This presentation describes the foundational concepts in chemistry, materials science and assembly processes for bioresorbable electronics in 1D, 2D and 3D architectures. Wireless sensors of intracranial temperature, pressure and electrophysiology designed for use in treatment of traumatic brain injury and nerve stimulators configured for accelerated neuroregeneration provide application examples.
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    Applications of Molecular Dopants and Interface Modifiers for Electronic and Opto-Electronic Applications
    (Georgia Institute of Technology, 2019-10-08) Marder, Seth R.
    Organic, hybrid, and 2D materials have attracted interest for electronic applications due to their potential for use in low-cost, large-area, flexible electronic devices. Here we will report on recent developments pertaining to surface modifiers and dopants that could impact the charge injection/collection/transport processes in organic light emitting diodes, organic field effect transistors, and photovoltaic devices. In particular, we will examine how N-heterocylic carbenes assemble on gold substrates, the impact of the surface dipole on the work function of the gold. We will also discuss the development of metallocenes-based dimers as n-dopants and very briefly describe metal dithiolene complexes as p-dopants for organic semiconductors and their impact of device performance.
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    Expansion of Electrospinnable Materials Beyond High Molecular Weight Polymers
    (Georgia Institute of Technology, 2019-09-24) Brettmann, Blair
    Electrospinning is a valuable production method for nanoscale polymeric fibers. However, a major limitation of the technology is the requirement for the use of high molecular weight polymers as a major part of the matrix. Many applications would benefit from a more expansive range in the materials able to be electrospun, including pharmaceuticals, wearable devices and diagnostics, and active filtration. In order to realize these more advanced functional materials, composites of polymers and particles must be developed and a strong understanding of how particle inclusion affects the electrospinning process and mat properties is essential. In this work, we examine material systems containing various polymers and active particles, focusing on how inclusion of particles affects electrospinnability and functionality of the fibrous mat. We have found that polymer solutions with high conductivity, hence narrow fiber diameters, tend to trap particles in a web-like structure, rather than within individual fibers. Other polymer-particle systems exhibit a ‘bunches of grapes’ morphology where the particles agglomerate yet the polymer matrix still surrounds them and connects the bunches with fibers. These interesting morphologies can be explained by conductivity, rheology, and particle interactions in the polymer solution. We also examine how particle inclusion affects the viscoelasticity of the solutions and tie this to the electrospinning process window; showing that a finite window of viscoelasticity yields optimal electrospinnability. We use these fundamental results to electrospin materials for advanced functional applications such as pharmaceuticals and conducting polymers and provide outlook for further work in increasing the range of materials that are electrospinnable.
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    Plate Mechanical Metamaterials and Their Applications
    (Georgia Institute of Technology, 2019-09-10) Bargatin, Igor
    Recently, we introduced the concept of plate mechanical metamaterials—cellular plates with carefully controlled periodic geometry and unique mechanical properties—as well as its initial realization in the form of freestanding corrugated plates made out of an ultrathin film. We used atomic layer deposition (ALD) and microfabrication techniques to make robust plates out of a single continuous ALD layer with cm-scale lateral dimensions and thicknesses between 25 and 100 nm, creating the thinnest freestanding plates that can be picked up by hand. We also fabricated and characterized nanocardboard - plate metamaterials made from multiple layers of nanoscale thickness, whose geometry and properties are reminiscent of honeycomb sandwich plates or corrugated paper cardboard. Ultralow weight, mechanical robustness, thermal insulation, as well as chemical and thermal stability of alumina make plate metamaterials attractive for numerous applications, including structural elements in flying microrobots and interstellar light sails, high-temperature thermal insulation in energy converters, photophoretic levitation, as well as ultrathin sensors and resonators. I will briefly discuss our experimental progress on all these applications, including demonstrations of extremely robust thermal insulators that can sustain a temperature difference of ~1000 K across a micron-scale gap, hollow AFM cantilevers that offer greatly enhanced sensitivity and data acquisition rates, and macroscopic plates that levitate when illuminated by light.
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    System Scaling Through Heterogeneous Integration
    (Georgia Institute of Technology, 2019-08-27) Swaminathan, Madhavan
    A combination of "Moore" (IC) and "More than Moore" (package) scaling has led to the shrinking of electronic systems over the last several decades. As scaling continues beyond CMOS to include advanced devices, scaling of the package needs to continue to enable system scaling, leading to the integration and miniaturization of systems. This requires new technologies for package integration which when connected to assembled ICs leads to System on Package (SoP) solutions that have superior performance and size as compared to current technologies. This presentation will discuss advanced SoP platforms for integration with a focus on heterogeneity for a variety of applications that include AI, HPC, Power Electronics, mmWave to name a few. The inter-disciplinary nature of the research will be highlighted based on faculty interactions between four different schools at GT.
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    The Future of Computer-Aided Engineering
    (Georgia Institute of Technology, 2019-04-23) Diestelhorst, Ryan
    New advancements in cloud computing and machine learning have created an opportunity for a revolutionary advancement in how hardware engineering is performed. In this talk, Ryan Diestelhorst will discuss his experiences founding a successful MEMS sensor company as a Georgia Tech graduate, and how that journey informed his vision of the future of engineering. He will describe how OnScale is redefining the boundaries of high-performance simulation by giving engineers immediate and unlimited access to super computers to solve their most difficult problems.
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    Neuro-Inspired Computing with Synaptic and Neuronal Devices
    (Georgia Institute of Technology, 2019-04-09) Yu, Shimeng
    Neuro-inspired computing is a new computing paradigm that emulates the neural network for information processing. To enable the large-scale neuromorphic system, it is important to develop compact nanoscale devices to support the synaptic and neuronal functions. In this talk, I will discuss recent progress in this domain that integrates oxide based synaptic and neuronal devices in neuromorphic hardware such as machine/deep learning accelerators. First, I will discuss the desired characteristics of HfO2 based resistive synaptic devices (e.g. analog multilevel states, weight tuning linearity, variation/noises) and NbO2 based oscillation neuron devices, and show the principles of offline training and online training. Next, I will introduce the crossbar array architecture to efficiently implement the weighted sum and weight update operations that are commonly used in the machine/deep learning algorithms, and show array-level experimental demonstrations for these key operations. Lastly, I will show our recent work on doped HfO2 based ferroelectric transistor based synaptic cell design that overcomes the challenges to achieve high training accuracy for online training.
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    Dimensional Control of Light-Matter Interaction in Perovskite Chalcogenides
    (Georgia Institute of Technology, 2019-03-26) Ravichandran, Jayakanth
    Perovskite Chalcogenides are a new class of semiconductors which have tunable band gap in the visible to infrared part of the electromagnetic spectrum. Besides this band gap tunability, they offer a unique opportunity to realize large density of states semiconductors with high carrier mobility. In this talk, I will discuss some of the experimental advances made both in my research group and in the research community on the theory, synthesis of these materials and understanding their optoelectronic properties. Perovskite chalcogenides have a large structural and chemical phase, which allows us finer knobs to tailor light-matter interaction precisely over a broad energy range spanning the visible to infrared spectrum. I will show that controlling dimensionality of these materials has profound influence on the light-matter interaction, which results in novel properties such as highly anisotropic absorption and refraction, unconventional band gap evolution. Finally, I will provide a general outlook for future studies on these exciting new class of materials