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Solid-State and Biological Systems Interface
The complexity, programmability, small size, and low cost of solid-state
devices in direct contact with biological samples and living organisms can
offer new capabilities in biology and biotechnology. We develop interfaces
between solid-state & bio systems. At molecular level, we build massively
parallel device arrays to analyze proteins & DNA in low-cost, chip-scale
platforms. The interface uses large-strength charge/photon coupling as well
as low-noise spin coupling. At cellular level, interconnected neurons cultured
on solid-state chips are stimulated, trained & monitored
electrochemically, where our long-term goals are: 1) helping understand
, in biologically relevant terms, informatics of neural interactions; 2)
interfacing sensory systems with ICs to enable autonomous machines that exploit
adaptive functions of living organisms.
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1H spin
resonance single-chip (CMOS) biomolecular sensor
[article]
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Plasmonic Circuits in Reduced Dimensions
Dimensionality profoundly influences condensed-matter electron behaviors,
with two-dimensional (2D) conductors, such as GaAs/AlGaAs 2D electron gas
and graphene, enabling discoveries of intriguing fundamental phenomena. One
effect of this reduced dimensionality concerns collective electron density
waves, or plasmonic waves. While surface plasmons on 3D bulk metals appear
in the optics regime with velocity typically down to ~c/10 (c: free-space
light velocity), 2D plasmons can appear in the electronics regiime and can
attain velocities below c/100. We engineer these ultra-subwavelength 2D plasmons
to build active and passive GHz~THz plasmonic circuits and metamaterials,
which can operate far below the diffraction limit, at near field, and in
dramatically miniaturized scale. Our research also examines collective behaviors
of interacting electrons in 1D conductors, such as carbon nanotubes and GaAs
quantum wires, whose long-term goal is to develop frequency-domain methods
to understand the physics of interacting electrons in one dimension.
Negative index metamaterial using ultra-subwavelength 2D plasmons
[article]
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Other Research
NMR oil detection (with Schlumberger); Dynamic nuclear polarization;
Complexity and cooperative behaviors; Quantum stochastic dynamics; Integrated
circuit design
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Facilities
Research Support
Air Force Office of Scientific Research (AFOSR)
Army Research Office (ARO)
National Science Foundation (NSF)
Schlumberger-Doll Research Center
Cavium Networks Inc.
National Institute of Health (NIH)
Harvard Nanoscale Engineering and Science Center (NSEC)
Electronics and Telecommunications Research Institute (ETRI)
IBM T.J. Watson Research Center
Analog Devices Inc. (ADI)
Samsung Electronics Co.
Ansoft Co.
Sonnet
Agilent
Harvard University
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Maxwell-Dworkin Laboratory, Harvard University,
33 Oxford Street,
Cambridge, MA 02138, USA
Donhee Ham: (617) 496-9451, Fax:
(617) 495-2489, Email:
donhee@seas.harvard.edu
Labs: (617) 496-0142, (617) 496-0318, (617)-496-3361, (617) 496-3267,
(617) 496-3163
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© 2007 Donhee Ham. All Rights Reserved. Last modified December 15th, 2010.
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