Now showing items 1-20 of 1854

    • Low-loss and single-mode tapered hollow-core waveguides optically coupled with interband and quantum cascade lasers 

      Giglio, Marilena; Patimisco, Pietro; Sampaolo, Angelo; Kriesel, Jason M.; Tittel, Frank K.; Spagnolo, Vincenzo (2018)
      We report single-mode midinfrared laser beam delivery through a 50-cm-long tapered hollow-core waveguide (HCW) having bore diameter linearly increasing from 200 to 260  μm. We performed theoretical calculations to identify ...
    • Magnetooptics of Exciton Rydberg States in a Monolayer Semiconductor 

      Stier, A.V.; Wilson, N.P.; Velizhanin, K.A.; Kono, J.; Xu, X.; Crooker, S.A. (2018)
      We report 65 T magnetoabsorption spectroscopy of exciton Rydberg states in the archetypal monolayer semiconductor WSe2. The strongly field-dependent and distinct energy shifts of the 2s, 3s, and 4s excited neutral excitons ...
    • Carbon nanotube woven textile photodetector 

      Zubair, Ahmed; Wang, Xuan; Mirri, Francesca; Tsentalovich, Dmitri E.; Fujimura, Naoki; Suzuki, Daichi; Soundarapandian, Karuppasamy P.; Kawano, Yukio; Pasquali, Matteo; Kono, Junichiro (2018)
      The increasing interest in mobile and wearable technology demands the enhancement of functionality of clothing through incorporation of sophisticated architectures of multifunctional materials. Flexible electronic and ...
    • Vector bin-and-cancel for MIMO distributed full-duplex 

      Bai, Jingwen; Sabharwal, Ashutosh (2017-08-04)
      Abstract In a multi-input multi-output (MIMO) full-duplex network, where an in-band full-duplex infrastructure node communicates with two half-duplex mobiles supporting simultaneous up- and downlink flows, ...
    • Beat frequency quartz-enhanced photoacoustic spectroscopy for fast and calibration-free continuous trace-gas monitoring 

      Wu, Hongpeng; Dong, Lei; Zheng, Huadan; Yu, Yajun; Ma, Weiguang; Zhang, Lei; Yin, Wangbao; Xiao, Liantuan; Jia, Suotang; Tittel, Frank K. (2017)
      Quartz-enhanced photoacoustic spectroscopy (QEPAS) is a sensitive gas detection technique which requires frequent calibration and has a long response time. Here we report beat frequency (BF) QEPAS that can be used for ...
    • Compact photoacoustic module for methane detection incorporating interband cascade light emitting device 

      Zheng, Huadan; Lou, Minhan; Dong, Lei; Wu, Hongpeng; Ye, Weilin; Yin, Xukun; Kim, Chul Soo; Kim, Mijin; Bewley, William W.; Merritt, Charles D.; Canedy, Chadwick L.; Warren, Michael V.; Vurgaftman, Igor; Meyer, Jerry R.; Tittel, Frank K. (2017)
      A photoacoustic module (PAM) for methane detection was developed by combining a novel 3.2 μm interband cascade light emitting device (ICLED) with a compact differential photoacoustic cell. The ICLED with a 22-stage interband ...
    • A Miniaturized QEPAS Trace Gas Sensor with a 3D-Printed Acoustic Detection Module 

      Yang, Xiaotao; Xiao, Youhong; Ma, Yufei; He, Ying; Tittel, Frank K. (2017)
      A 3D printing technique was introduced to a quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor and is reported for the first time. The acoustic detection module (ADM) was designed and fabricated using the 3D printing ...
    • Lenslet array tunable snapshot imaging spectrometer (LATIS) for hyperspectral fluorescence microscopy 

      Dwight, Jason G.; Tkaczyk, Tomasz S. (2017)
      Snapshot hyperspectral imaging augments pixel dwell time and acquisition speeds over existing scanning systems, making it a powerful tool for fluorescence microscopy. While most snapshot systems contain fixed datacube ...
    • Gold coated iron phosphide core–shell structures 

      Kelly, Anna T.; Filgueira, Carly S.; Schipper, Desmond E.; Halas, Naomi J.; Whitmire, Kenton H. (2017)
      Core–shell particles Fe2P@Au have been prepared beginning with Fe2P nanorods, nanocrosses and nanobundles prepared from the solvothermal decomposition of H2Fe3(CO)9(μ3-PtBu). Iron phosphide structures can be produced from ...
    • Giant Terahertz-Wave Absorption by Monolayer Graphene in a Total Internal Reflection Geometry 

      Harada, Yoichi; Ukhtary, Muhammad Shoufie; Wang, Minjie; Srinivasan, Sanjay K.; Hasdeo, Eddwi H.; Nugraha, Ahmad R.T.; Noe, G. Timothy II; Sakai, Yuji; Vajtai, Robert; Ajayan, Pulickel M.; Saito, Riichiro; Kono, Junichiro (2017)
      We experimentally demonstrated significant enhancement of terahertz-wave absorption in monolayer graphene by simply sandwiching monolayer graphene between two dielectric media in a total internal reflection geometry. In ...
    • Molecular machines open cell membranes 

      García-López, Víctor; Chen, Fang; Nilewski, Lizanne G.; Duret, Guillaume; Aliyan, Amir; Kolomeisky, Anatoly B.; Robinson, Jacob T.; Wang, Gufeng; Pal, Robert; Tour, James M. (2017)
      Beyond the more common chemical delivery strategies, several physical techniques are used to open the lipid bilayers of cellular membranes[1]. These include using electric[2] and magnetic[3] fields, temperature[4], ...
    • Present but Unreachable: Reducing Persistentlatent Secrets in HotSpot JVM 

      Pridgen, Adam; Garfinkel, Simson L.; Wallach, Dan S. (2017)
      Applications that manage sensitive secrets, including cryptographic keys, are typically engineered to overwrite the secrets in memory once they’re no longer necessary, offering an important defense against forensic attacks ...
    • Hippocampal awake replay in fear memory retrieval 

      Wu, Chun-Ting; Haggerty, Daniel; Kemere, Caleb; Ji, Daoyun (2017)
      Hippocampal place cells are key to episodic memories. How these cells participate in memory retrieval remains unclear. After rats acquired a fear memory by receiving mild footshocks in a shock zone on a track, we analyzed ...
    • A Context-Aware Trust Framework for Resilient Distributed Cooperative Spectrum Sensing in Dynamic Settings 

      Vosoughi, Aida; Cavallaro, Joseph R.; Marshall, Alan (2017)
      Cognitive radios enable dynamic spectrum access where secondary users (SUs) are allowed to operate on the licensed spectrum bands on an opportunistic noninterference basis. Cooperation among the SUs for spectrum sensing ...
    • Decentralized Baseband Processing for Massive MU-MIMO Systems 

      Li, Kaipeng; Sharan, Rishi; Chen, Yujun; Goldstein, Tom; Cavallaro, Joseph R.; Studer, Christoph (2017)
      Achieving high spectral efficiency in realistic massive multi-user (MU) multiple-input multiple-output (MIMO) wireless systems requires computationally-complex algorithms for data detection in the uplink (users transmit ...
    • Low-complexity, Multi Sub-band Digital Predistortion: Novel Algorithms and SDR Verification 

      Tarver, Chance; Abdelaziz, Mahmoud; Anttila, Lauri; Cavallaro, Joseph R. (2017)
      The nonlinearities of power amplifiers combined with non-contiguous transmissions found in modern, frequency-agile, wireless standards create undesirable spurious emissions through the nearby spectrum of data carriers. ...
    • Continuous checkpointing of HTM transactions in NVM 

      Giles, Ellis; Doshi, Kshitij; Varman, Peter (2017)
      This paper addresses the challenges of coupling byte addressable non-volatile memory (NVM) and hardware transaction memory (HTM) in high-performance transaction processing. We first show that HTM transactions can be ordered ...
    • Reconstructing rooms using photon echoes: A plane based model and reconstruction algorithm for looking around the corner 

      Pediredla, Adithya Kumar; Buttafava, Mauro; Tosi, Alberto; Cossairt, Oliver; Veeraraghavan, Ashok (2017)
      Can we reconstruct the entire internal shape of a room if all we can directly observe is a small portion of one internal wall, presumably through a window in the room? While conventional wisdom may indicate that this is ...
    • Modulation-Doped Multiple Quantum Wells of Aligned Single-Wall Carbon Nanotubes 

      Komatsu, Natsumi; Gao, Weilu; Chen, Peiyu; Guo, Cheng; Babakhani, Aydin; Kono, Junichiro (2017)
      Heterojunctions, quantum wells, and superlattices with precise doping profiles are behind today's electronic and photonic devices based on III–V compound semiconductors such as GaAs. Currently, there is considerable interest ...
    • Exploring the effect of food intake and physical activity on body weight 

      Prioleau, Temiloluwa; Heng, Yuqiang; Veeraraghavan, Ashok; Sabharwal, Ashutosh (2017)
      Body weight is an important measurement parameter towards management of obesity, diabetes and overall health. Previous research and society at large has primarily focused on long-term fluctuation in body weight to describe ...