Patents
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Steven R. Visuri,
Anthony J. Makarewicz, Richard A. London, William J. Benett, Peter
Krulevitch, Luiz B. Da Silva
Laser and Acoustic Lens for Lithotripsy
U.S. Patent 6,491,685 B2
December 10, 2002
An acoustic focusing device whose acoustic waves are generated by
laser radiation through an optical fiber. The acoustic energy can
efficiently destroy renal and biliary calculi and is delivered to
the site of the calculi via an endoscopic procedure. The device
includes a transducer tip attached to the distal end of an optical
fiber through which laser energy is directed. The transducer tip
encapsulates an exogenous absorbing dye. Under proper irradiation
conditions (high absorbed energy density, short pulse duration),
a stress wave is produced via thermoelastic expansion of the absorber
for the destruction of the calculi. The transducer tip can be configured
into an acoustic lens such that the transmitted acoustic wave is
shaped or focused. Also, compressive stress waves can be reflected
off a high densitylow density interface to invert the compressive
wave into a tensile stress wave. Tensile stresses may be more effective
in some instances in disrupting material because most materials
are weaker in tension than compression. Estimations indicate that
stress amplitudes provided by this device can be magnified more
than 100 times, greatly improving the efficiency of optical energy
for targeted material destruction.
Robert J. Deri,
Oliver T. Strand, Henry E. Garrett
Optical Add/Drop Filter for Wavelength Division
Multiplexed Systems
U.S. Patent 6,493,484 B1
December 10, 2002
An optical add/drop filter for wavelength division multiplex systems
and construction methods. The add/drop filter includes a first ferrule
having a first preformed opening for receiving a first optical fiber;
an interference filter oriented to pass a first set of wavelengths
along the first optical fiber and reflect a second set of wavelengths;
and a second ferrule having a second preformed opening for receiving
the second optical fiber and the reflected second set of wavelengths.
The method for constructing the optical add/drop filter consists
of forming a first set of openings in a first ferrule; inserting
a first set of optical fibers into the first set of openings; forming
a first set of guide pin openings in the first ferrule; dividing
the first ferrule into a first ferrule portion and a second ferrule
portion; forming an interference filter on the first ferrule portion;
inserting guide pins through the first set of guide pin openings
in the first ferrule portion and second ferrule portion to passively
align the first set of optical fibers; removing material such that
light reflected from the interference filter from the first set
of optical fibers is accessible; forming a second set of openings
in a second ferrule; inserting a second set of optical fibers into
the second set of openings; and positioning the second ferrule with
respect to the first ferrule such that the second set of optical
fibers receive the light reflected from the interference filter.
Babak Sadigh,
Thomas J. Lenosky, Tomas Diaz de la Rubia, Martin Giles, Maria-Jose
Caturla, Vidvuds Ozolins, Mark Asta, Silva Theiss, Majeed Foad,
Andrew Quong
Method for Enhancing the Solubility of Boron and
Indium in Silicon
U.S. Patent 6,498,078 B2
December 24, 2002
A method for enhancing the equilibrium solubility of boron and indium
in silicon. The method involves first-principles quantum mechanical
calculations to determine the temperature dependence of the equilibrium
solubility of two important p-type dopants in silicon, namely boron
and indium, under various strain conditions. The equilibrium thermodynamic
solubility of size-mismatched impurities, such as boron and indium
in silicon, can be raised significantly if the silicon substrate
is strained appropriately. For example, for boron, a 1-percent compressive
strain raises the equilibrium solubility by 100 percent at 1,100êC;
and for indium, a 1-percent tensile strain at 1,100êC corresponds
to an enhancement of the solubility by 200 percent.
Conrad Yu
Micro-Machined Thermo-Conductivity Detector
U.S. Patent 6,502,983 B2
January 7, 2003
A micromachined thermal conductivity detector for a portable gas
chromatograph. The detector is highly sensitive and has fast response
time to enable detection of small gas samples, on the order of nanoliters,
in a portable gas chromatograph. The high sensitivity and fast response
time are achieved through micromachined devices composed of a nickel
wire, for example, on a silicon nitride window, about a millimeter
square, formed in a silicon member. In addition to operating as
a thermal conductivity detector, the silicon nitride window with
a micromachined wire therein can be used as a fast response heater
for polymerase chain reaction applications.
William J. Benett,
James B. Richards
PCR Thermocycler
U.S. Patent 6,503,750 B1
January 7, 2003
A sleeve-type silicon polymerase chain reaction (PCR) chamber or
thermocycler having improved thermal performance. The improved thermal
performance comes from etched features in the chamber that reduce
thermal mass and increase the surface area of the sleeve for cooling.
The improved thermal performance increases the speed and efficiency
of the reaction chamber. The improvement is accomplished by providing
grooves in the faces of the sleeve and a series of grooves on the
interior surfaces that connect with the grooves on the faces of
the sleeve. The grooves can be anisotropically etched in the silicon
sleeve simultaneously with formation of the chamber.
D. Kent Lewis
Compensated Individually Addressable Array Technology
for Human Breast Imaging
U.S. Patent 6,504,288 B2
January 7, 2003
A method of forming broad bandwidth acoustic or microwave beams
that encompass array design, array excitation, source signal preprocessing,
and received signal postprocessing. This technique uses several
different methods to achieve improvement over conventional array
systems. These methods are (1) individually addressable array elements
without any moving parts, which allow scanning around and over an
object such as a human breast; (2) digital-to-analog converters
for the source signals, which allow virtually any radiated field
to be created in the half-space in front of the array; (3) inverse
filtering from source precompensation, which allows for corrections
in the system, most notably in the response of the individual elements
and in the ability to increase contrast and resolution of signal
propagating through the medium under investigation; and (4) spectral
extrapolation to expand the bandwidth of the received signals. Used
together, the system allows for compensation to create beams of
any desired shape, control the wave fields generated to correct
for medium differences, and improve contrast and resolution in and
through the medium.
Ronald G. Musket,
Robert G. Patterson
Versatile, High-Sensitivity Faraday Cup Array
for Ion Implanters
U.S. Patent 6,507,033 B1
January 14, 2003
An improved Faraday cup array for determining the dose of ions delivered
to a substrate during ion implantation and for monitoring the uniformity
of the dose delivered to the substrate. The improved Faraday cup
array incorporates a variable size ion beam aperture by changing
only an insertable plate that defines the aperture without changing
the position of the Faraday cup, which is positioned for the operation
of the largest ion beam aperture. The design enables the dose sensitivity
range, typically from 1011 to 1018 ions per square centimeter, to
be extended to below a million (106) ions per square centimeter.
The insertable plate-aperture arrangement is structurally simple
and enables scaling to aperture areas between lesser than 1 square
centimeter and greater than 750 square centimeters, and enables
ultrahigh vacuum (UHV) applications by incorporation of UHV-compatible
materials.
Conrad Yu
Chemical Method for Producing Smooth Surfaces
on Silicon
U.S. Patent 6,514,875 B1
February 4, 2003
An improved method for producing optically smooth surfaces in silicon
wafers during wet chemical etching involves a pretreatment rinse
of the wafer before etching and a postetching rinse. The pretreatment
with an organic solvent provides a well-wetted surface that ensures
uniform mass transfer during etching, which results in optically
smooth surfaces. The postetching treatment with an acetic acid solution
stops the etching instantly, preventing any uneven etching that
leads to surface roughness. This method can be used to etch silicon
surfaces to a depth of 200 micrometers or more, while the finished
surfaces have a surface roughness of only 1.5 to 5.0 nanometers.
Michael D. Perry
High-Resolution Imaging and Target Designation
through Clouds or Smoke
U.S. Patent 6,515,737 B2
February 4, 2003
A method and system of combining gated intensifiers and advances
in solid-state, short-pulse laser technology to create compact systems
capable of producing high-resolution (that is, approximately less
than 20 centimeters) optical images through a scattering medium
such as dense clouds, fog, or smoke from air- or ground-based platforms.
Laser target designation through a scattering medium is also enabled
by using a short-pulse illumination laser and a relatively minor
change to the detectors on laser-guided munitions.
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