Now showing items 1-16 of 16

    • Adaptive Optics based Telescope Arrays Receiver for Compensation of Optical Turbulence Effects in a Deep-Space Optical Communication link with Mars 

      Hashmi, A.; Eftekhar, Ali Asghar; Adibi, Ali; Amoozegar, Farid (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009)
      Future deep-space exploration missions demand a broadband and integrated communication infrastructure to transport the scientific data to Earth. Optical communication employing optical arrays receiver is a viable ...
    • Analysis of telescope arrays based receiver for deep-space optical communications with Mars 

      Hashmi, A.; Eftekhar, Ali Asghar; Adibi, Ali; Amoozegar, Farid (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009-10)
      Telescope arrays receivers are analyzed for deep-space optical communications between Earth and Mars. It is shown that data rates up to 14 M bits/sec are possible when Mars is at the farthest range from the Earth.
    • Athermal operation in polymer-clad silicon microdisk resonators 

      Alipour, Payam; Hosseini, Ehsan Shah; Eftekhar, Ali Asghar; Momeni, Babak; Adibi, Ali (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009-10)
      We have used a urethane polymer as cladding to reduce the temperature sensitivity of resonance in high-Q silicon microdisk resonators. A two-order-of-magnitude improvement in resonance stability is demonstrated, and ...
    • Effect of Stress Due to Plastic Package Moisture Absorption in Hall Sensors 

      Cesaretti, Juan Manuel; Taylor, W. P.; Monreal, G.; Brand, Oliver (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009-06)
      Commercial magnetic sensors based on the Hall effect are usually encapsulated in non-hermetic plastic packages. These plastic packages are known to swell in high humidity conditions due to moisture absorption. This swelling ...
    • The Evolution Study Of Thin Film Structure During The Film Formation 

      Park, Min Sang; Aiyar, Avisheck; Park, Jung Ok; Reichmanis, Elsa; Srinivasarao, Mohan (Georgia Institute of TechnologyAmerican Institute of Physics, 2010-01)
    • Functionalization of high frequency SAW RFID devices for ozone dosimetry 

      Westafer, Ryan S.; Levitin, Galit; Hess, Dennis W.; Bergin, Michael H.; Edmonsonx, Peter J.; Hunt, William D. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009)
      In this paper we report new work on the gravimetric detection of ozone at EPA and OSHA relevant concentrations (approximately 100 ppb) in filtered ambient air. We have extended our proof-of-concept work which used both ...
    • Large-scale array of small high-Q microdisk resonators for on-chip spectral analysis 

      Soltani, Mohammad; Li, Qing; Yegnanarayanan, Siva; Momeni, Babak; Eftekhar, Ali Asghar; Adibi, Ali (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009-10)
      We demonstrate on-chip, large-scale arrays of small high-Q microdisk resonators, suitable for both in-plane coupling and out-of-plane (imaging) spectral analysis devices with high resolution (linewidth < 50pm to 0.5nm), ...
    • Multipath Fading Measurements at 5.8 GHz for Backscatter Tags With Multiple Antennas 

      Griffin, Joshua D.; Durgin, Gregory D. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2010-11)
      Multipath fading can be heavy for ultra-high frequency (UHF) and microwave backscatter radio systems used in applications such as radio frequency identification (RFID). This paper presents measurements of fading on the ...
    • Proximity Lithography in Sub-10 Micron Circuitry for Packaging Substrate 

      Wang, Fengtao; Liu, Fuhan; Kong, Linghua; Sundaram, Venky; Tummala, Rao R.; Adibi, Ali (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2010-11)
      Rapid changes in the semiconductor industry will continue toward higher functionality that leads to higher input/outputs (I/O) counts, pushing packaging towards higher density architectures. In the next two to three ...
    • Quasi 2-D Field Reconstruction Using the Conjoint Cylindrical Wave Expansion 

      Pirkl, Ryan J.; Durgin, Gregory D. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009-04)
      Off-the-horizon propagation severely degrades the accuracy of any field reconstruction technique that presupposes a two-dimensional (2-D) wireless channel. Therefore, employing the 2-D cylindrical wave expansion (CWE) ...
    • Revisiting the Spread Spectrum Sliding Correlator: Why Filtering Matters 

      Pirkl, Ryan J.; Durgin, Gregory D. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009-07)
      A wireless channel sounder based upon the conventional spread spectrum sliding correlator implementation uses unfiltered pseudo-random noise (PN) at both the transmitter and receiver to generate a time-dilated copy of ...
    • A row-action based L₁-minimization approach to robust fluorescent tomography 

      Mohajerani, Pouyan; Behrooz, Ali; Eftekhar, Ali A.; Adibi, Ali (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009-10)
      We present a row-action method based on minimization of the L₁ norm for improving the accuracy of fluorescent tomography in reconstruction of fluorescent objects. The method is validated using a CW system and milk-based ...
    • Sub-microsecond thermal reconfiguration of silicon photonic devices 

      Atabaki, Amir H.; Eftekhar, Ali A.; Yegnanarayanan, Siva; Adibi, Ali (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009-10)
      Using the experimental data we show the possibility of sub-microsecond reconfiguration of silicon photonics microresonators through pulse shaping of micro-heater excitation. Also, a novel heater structure based on small ...
    • Sustained GHz oscillations in ultra-high Q silicon microresonators 

      Soltani, Mohammad; Yegnanarayanan, Siva; Li, Qing; Atabaki, Amir; Eftekhar, Ali A.; Adibi, Ali (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2009)
      We report the experimental observation of long-sustained GHz electronic oscillations resulting from coupled electron-photon dynamics in ultra-high-Q Si microdisk resonators with CW pumping. Theoretical analysis identifies ...
    • A Temperature-Insensitive Third-Order Coupled-Resonator Filter for On-Chip Terabit/s Optical Interconnects 

      Li, Qing; Yegnanarayanan, Siva; Soltani, Mohammad; Alipour, Payam; Adibi, Ali (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2010-12)
      We design and demonstrate a temperature-insensitive third-order coupled-resonator filter in the silicon-on-insulator platform for on-chip terabit/s optical interconnects. Optimum filter design enables up to 21 flat-band ...
    • A theoretical view on self-assembled monolayers in organic electronic devices 

      Heimel, Georg; Romaner, Lorenz; Zojer, Egbert; Brédas, Jean-Luc (Georgia Institute of TechnologySociety of Photo-optical Instrumentation Engineers (SPIE), 2008-04)
      Self-assembled monolayers (SAMs) of covalently bound organic molecules are rapidly becoming an integral part of organic electronic devices. There, SAMs are employed to tune the work function of the inorganic electrodes in ...