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Dive into the research topics where Felix Lu is active.

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Featured researches published by Felix Lu.


Applied Physics Letters | 2010

Independent individual addressing of multiple neutral atom qubits with a micromirror-based beam steering system

Caleb Knoernschild; Larry Isenhower; Alex T. Gill; Felix Lu; Mark Saffman; Jungsang Kim

We demonstrate a scalable approach to addressing multiple atomic qubits for use in quantum information processing. Individually trapped R87b atoms in a linear array are selectively manipulated with a single laser guided by a microelectromechanical beam steering system. Single qubit oscillations are shown on multiple sites at frequencies of ≃3.5 MHz with negligible crosstalk to neighboring sites. Switching times between the central atom and its closest neighbor were measured to be 6–7 μs while moving between the central atom and an atom two trap sites away took 10–14 μs.


Optics Letters | 2008

MEMS-based optical beam steering system for quantum information processing in two-dimensional atomic systems

Caleb Knoernschild; Changsoon Kim; Bin Liu; Felix Lu; Jungsang Kim

To provide scalability to quantum information processors utilizing trapped atoms or ions as quantum bits (qubits), the capability to address multiple individual qubits in a large array is needed. Microelectromechanical systems (MEMS) technology can be used to create a flexible and scalable optical system to direct the necessary laser beams to multiple qubit locations. We developed beam steering optics using controllable MEMS mirrors that enable one laser beam to address multiple qubit locations in a two-dimensional trap lattice. MEMS mirror settling times of approximately 10 micros were demonstrated, which allow for fast access time between qubits.


Optics Express | 2009

Multiplexed broadband beam steering system utilizing high speed MEMS mirrors.

Caleb Knoernschild; Changsoon Kim; Felix Lu; Jungsang Kim

We present a beam steering system based on micro-electromechanical systems technology that features high speed steering of multiple laser beams over a broad wavelength range. By utilizing high speed micromirrors with a broadband metallic coating, our system has the flexibility to simultaneously incorporate a wide range of wavelengths and multiple beams. We demonstrate reconfiguration of two independent beams at different wavelengths (780 and 635 nm) across a common 5x5 array with 4 micros settling time. Full simulation of the optical system provides insights on the scalability of the system. Such a system can provide a versatile tool for applications where fast laser multiplexing is necessary.


Applied Physics Letters | 2007

Band discontinuity measurements of the wafer bonded InGaAs∕Si heterojunction

Kyle S. McKay; Felix Lu; Jungsang Kim; Changhyun Yi; April S. Brown; Aaron R. Hawkins

p-type InGaAs∕Si heterojunctions were fabricated through a wafer fusion bonding process. The relative band alignment between the two materials at the heterointerface was determined using current-voltage (I-V) measurements and applying thermionic emission-diffusion theory. The valence and conduction band discontinuities for the InGaAs∕Si interface were determined to be 0.48 and −0.1eV, respectively, indicating a type-II band alignment.


IEEE\/ASME Journal of Microelectromechanical Systems | 2010

Investigation of Optical Power Tolerance for MEMS Mirrors

Caleb Knoernschild; Changsoon Kim; Christopher W. Gregory; Felix Lu; Jungsang Kim

Optical power tolerance on micromirrors is a critical aspect of many high-power optical systems. Absorptive heating can negatively impact the performance of an optical system by altering the micromirrors curvature during operation. This can lead to shifts in the beam waist locations or imaging planes within a system. This paper describes a scheme to measure the impact of mirror heating by optical power and determine the power tolerances of micromirrors with gold and aluminum coatings using a 532-nm laser. Results are compared with an analytical model of thermally induced stress and optical absorptive heating. Experimental data shows that gold-coated mirrors are able to handle 40 mW of optical power with a beam waist displacement of less than 20% of the output Rayleigh length, while aluminum-coated mirrors can tolerate 125 mW. Measured data along with modeling suggest that, with proper metal coating, optical powers greater than 1 W should not adversely affect the system performance.


conference on lasers and electro optics | 2007

Integrated optics technology for quantum information processing in atomic systems

Changsoon Kim; Caleb Knoernschild; Bin Liu; Kyle S. McKay; Felix Lu; Jungsang Kim

Scalable quantum information processing in ion traps or neutral atoms requires highly integrated and functional optical systems for qubit manipulation and detection. We discuss and demonstrate integrated optics technologies that are relevant for this application.


Bulletin of the American Physical Society | 2010

Scalable neutral atom quantum computing with MEMS micromirrors

Caleb Knoernschild; Felix Lu; Hoon Ryu; Michael Feng; Jungsang Kim


Bulletin of the American Physical Society | 2008

Broadband Multi-Spot Optical Beam Steering with Independent 2D Addressability for Quantum Information Processing

Caleb Knoernschild; Changsoon Kim; Felix Lu; Jungsang Kim


Frontiers in Optics | 2007

Compact High Quantum Efficiency Single Photon Detector in the Ultraviolet Wavelengths

Kyle S. McKay; Felix Lu; Jungsang Kim; Henry H. Hogue


Bulletin of the American Physical Society | 2007

Optical MEMS Based Beam Steering for 2D lattice

Caleb Knoernschild; Changsoon Kim; Felix Lu; Bin Liu; Jungsang Kim

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Hoon Ryu

Korea Institute of Science and Technology Information

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Alex T. Gill

University of Wisconsin-Madison

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