Now showing items 41-60 of 31861

    • Photonic anomalous quantum hall effect 

      Mittal, Sunil; Orre, Venkata Vikram; Leykam, Daniel; Chong, Yi Dong; Mohammad Hafezi (2019)
      We experimentally realize a photonic analogue of the anomalous quantum Hall insulator using a two-dimensional (2D) array of coupled ring resonators. Similar to the Haldane model, our 2D array is translation invariant, has ...
    • Realization of an acoustic third-order topological insulator 

      Xue, Haoran; Yang, Yahui; Liu, Guigeng; Gao, Fei; Chong, Yidong; Zhang, Baile (2019)
      The recent discovery of higher-order topological insulators (TIs) has opened new possibilities in the search for novel topological materials and metamaterials. Second-order TIs have been implemented in two-dimensional (2D) ...
    • Mode instability in a Yb-doped stretched core fiber 

      Xia, Nan; Yoo, Seongwoo (2017)
      In this work we present the theoretical study of transverse mode instability (TMI) in ytterbium (Yb)-doped rectangular core fibers with different core aspect ratios using the fast Fourier transform (FFT) beam propagation ...
    • Microscopy using randomized speckle illumination 

      Perinchery, Sandeep Menon; Shinde, Anant; Murukeshan, Vadakke Matham (2017)
      It is well known for structured illumination microscopy (SIM) that the lateral resolution by a factor of two beyond the classical diffraction limit is achieved using spatially structured illumination in wide-field fluorescence ...
    • Optical gating of resonance fluorescence from a single germanium vacancy color center in diamond 

      Chen, Disheng; Mu, Zhao; Zhou, Yu; Fröch, Johannes E.; Rasmit, Abdullah; Diederichs, Carole; Zheludev, Nikolay; Aharonovich, Igor; Gao, Wei-bo (2019)
      Scalable quantum photonic networks require coherent excitation of quantum emitters. However, many solid-state systems can undergo a transition to a dark shelving state that inhibits the resonance fluorescence. Here, we ...
    • Critical conditions for jumping droplets 

      Vo, Quoc; Tran, Tuan (2019)
      A droplet initially overstretched on a solid substrate pulls back to lower the contact area and may jump away from the substrate. The condition to realize such macroscopic behaviors is often dictated by microscopic ...
    • High performance city rendering in Vulkan 

      Zhang, Alex; Chen, Kan; Johan, Henry; Erdt, Marius (2018)
      City scale scenes often contain large amounts of geometry and texture that cannot altogether fit on GPU memory. Our ongoing work seek to minimise texture memory usage by streaming only view-relevant textures and to improve ...
    • Distribution-based semi-supervised learning for activity recognition 

      Qian, Hangwei; Pan, Sinno Jialin; Miao, Chunyan (2019)
      Supervised learning methods have been widely applied to activity recognition. The prevalent success of existing methods, however, has two crucial prerequisites: proper feature extraction and sufficient labeled training ...
    • The stress granule protein G3BP1 binds viral dsRNA and RIG-I to enhance interferon-β response 

      Kim, Susana Soo-Yeon; Sze, Lynette; Lam, Kong-Peng (2019)
      RIG-I senses viral RNA in the cytosol and initiates host innate immune response by triggering the production of type 1 interferon. A recent RNAi knockdown screen yielded close to hundred host genes whose products affected ...
    • Optical and electrical properties of two-dimensional palladium diselenide 

      Zhang, George; Amani, Matin; Chaturvedi, Apoorva; Tan, Chaoliang; Bullock, James; Song, Xiaohui; Kim, Hyungjin; Lien, Der-Hsien; Scott, Mary C.; Zhang, Hua; Javey, Ali (2019)
      Two-dimensional (2D) noble-metal dichalcogenides exhibit exceptionally strong thickness-dependent bandgaps, which can be leveraged in a wide variety of device applications. A detailed study of their optical (e.g., optical ...
    • Small-signal modeling, stability analysis, and controller design of grid-friendly power converters with virtual inertia and grid-forming capability 

      Deng, Han; Fang, Jingyang; Yu, Jiale; Tang, Yi; Debusschere, Vincent (2019)
      Distributed virtual inertia provided by grid-friendly power converters is emerging as an effective way for inertia enhancement and frequency regulation improvement in more-electronics power systems. However, most existing ...
    • An essential descriptor for the oxygen evolution reaction on reducible metal oxide surfaces 

      Huang, Xiang; Wang, Jiong; Tao, Hua Bing; Tian, Hao; Xu, Hu (2019)
      The development of a universal activity descriptor like the d-band model for transition metal catalysts is of great importance to catalyst design. However, due to the complicated electronic structures of metal oxides, the ...
    • Breaking diffraction limit of far-field imaging via structured illumination bessel beam microscope (SIBM) 

      Perinchery, Sandeep Menon; Haridas, Aswin; Shinde, Anant; Buchnev, Oleksandr; Murukeshan, Vadakke Matham (2019)
      Breaking the diffraction limit in imaging microscopes with far-field imaging options has always been the thrust challenge for optical engineers and biologists over the years. Although structured illumination microscopy and ...
    • Multi-beam interferometric patterning in optically transparent materials 

      Tham, Nicholas; Kim, Young Jin; Murukeshan, Vadakke Matham (2017)
      A method to directly pattern nanoscale periodic features within optically transparent solid materials by means of a configurable multi-beam femtosecond laser interference is proposed. While femtosecond micromachining of ...
    • Nanoparticle sorting in silicon waveguide arrays 

      Zhao, Haitao; Zhang, Yi; Chin, Lip Ket; Yap, Peng Huat; Wang, Kuan; Ser, Wee; Liu, Ai Qun (2017)
      This paper presents the optical fractionation of nanoparticles in silicon waveguide arrays. The optical lattice is generated by evanescent coupling in silicon waveguide arrays. The hotspot size is tunable by changing the ...
    • Non-invasive multimodality imaging directly shows TRPM4 inhibition ameliorates stroke reperfusion injury 

      Chen, Bo; Ng, Gandi; Gao, Yahui; Low, See Wee; Sandanaraj, Edwin; Ramasamy, Boominathan; Sekar, Sakthivel; Bhakoo, Kishore; Soong, Tuck Wah; Nilius, Bernd; Tang, Carol; Robins, Edward G.; Goggi, Julian; Liao, Ping (2018)
      The transient receptor potential melastatin 4 (TRPM4) channel has been suggested to play a key role in the treatment of ischemic stroke. However, in vivo evaluation of TRPM4 channel, in particular by direct channel ...
    • Comparative heterochromatin profiling reveals conserved and unique epigenome signatures linked to adaptation and development of malaria parasites 

      Fraschka, Sabine A.; Filarsky, Michael; Hoo, Regina; Niederwieser, Igor; Yam, Xue Yan; Brancucci, Nicolas M. B.; Mohring, Franziska; Mushunje, Annals Tatenda; Huang, Ximei; Christensen, Peter R.; Nosten, Francois; Bozdech, Zbynek; Russell, Bruce; Moon, Robert W.; Marti, Matthias; Preiser, Peter Rainer; Bártfai, Richárd; Voss, Till S. (2018)
      Heterochromatin-dependent gene silencing is central to the adaptation and survival of Plasmodium falciparum malaria parasites, allowing clonally variant gene expression during blood infection in humans. By assessing ...
    • Tensile strength of large-scale incipient rock joints : a laboratory investigation 

      Shang, Junlong; West, L. J.; Hencher, S. R.; Zhao, Zhiye (2017)
      In this paper, a testing methodology was developed in the laboratory to measure the tensile strength of large-scale incipient rock joints. In the test, an expansive grout was used to develop the tensile force. Each test ...
    • High-speed photo detection at two-micron-wavelength : technology enablement by GeSn/Ge multiple-quantum-well photodiode on 300 mm Si substrate 

      Xu, Shengqiang; Wang, Wei; Huang, Yi-Chiau; Dong, Yuan; Masudy-Panah, Saeid; Wang, Hong; Gong, Xiao; Yeo, Yee-Chia (2019)
      We report high-speed photo detection at two-micron-wavelength achieved by a GeSn/Ge multiple-quantum-well (MQW) p-i-n photodiode, exhibiting a 3-dB bandwidth (f3-dB) above 10 GHz for the first time. The epitaxy of device ...
    • An efficient image formation algorithm for real-time linear-array photoacoustic tomography 

      Mozaffarzadeh, Moein; Periyasamy, Vijitha; Upputuri, Paul Kumar; Pramanik, Manojit; Makkiabadi, Bahador (2019)
      In photoacoustic (PA) imaging using commercial ultrasound transducers, two dimensional PA images are pro-duced by commonly used delay-and-sum (DAS) as the reconstruction method. However, the reconstructed image is a ected ...