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Papers by Reid Brennen
2007 Digest of the IEEE/LEOS Summer Topical Meetings, 2007
An overview of the laser ablation fabrication
Micro Total Analysis Systems 2000, 2000
... 1 reader Save reference to library · Related research. Optimization of Turn Geometries for Mi... more ... 1 reader Save reference to library · Related research. Optimization of Turn Geometries for Microchip Electrophoresis. Joshua I Molho, Amy E Herr, Bruce P Mosier, Juan G Santiago, Thomas W Kenny, Reid A Brennen, et al. in ...
Analytical Chemistry, 2001
Chip-based microcolumn separation systems often require serpentine channels to achieve longer sep... more Chip-based microcolumn separation systems often require serpentine channels to achieve longer separation lengths within a compact area. However, analyte bands traveling through curved channels experience an increased dispersion that ...
Spie Milestone Series, 1999
ABSTRACT A micromachined chopper has demonstrated modulation of coherent and incoherent light. Th... more ABSTRACT A micromachined chopper has demonstrated modulation of coherent and incoherent light. The chopper uses an electrostatically driven lateral micromotor to actuate a shutter plate across a through-substrate window. Test devices have been fabricated and exhibit operating frequencies ranging from 1 to 31 kHz and have stable deflection amplitudes of 400 micrometers . Further optimizations of the design are discussed.
Analytical chemistry, Jan 21, 2015
A planar, chip-based flow cell for UV-VIS absorbance detection in HPLC is presented. The device f... more A planar, chip-based flow cell for UV-VIS absorbance detection in HPLC is presented. The device features a micro-fabricated free-standing liquid core waveguide (LCW) capillary detection tube of long path length that is based on total internal reflection. We report on the linearity and calibration slope characteristics of lithographically produced LCWs with different interior/exterior geometries. 3D ray tracing was indispensable in modeling behavior in the more demanding geometries: multipath behavior may be intrinsic to these waveguides with consequent non-linearity. Fortunately, non-linearity in lithographically easy-to-produce waveguide geometries (such as with a flat, concave exterior and a round interior) is not as detrimental as might be initially expected. Experimental performance is predictably affected by the attainable surface quality of the LCW and efficient and reproducible coupling of the input light into the LCW.
Rev Sci Instr, 1996
Our objective is the fabrication of small high-precision parts using LIGA, which can be used in a... more Our objective is the fabrication of small high-precision parts using LIGA, which can be used in a variety of industrial applications. LIGA is a combination of deep x-ray lithography, electroplating, and replication processes that enables the fabrication of microstructures with vertical dimensions several millimeters high, lateral dimensions in the micrometer range, and submicron tolerances. On beamline 10.3.2, at the Advanced Light Source (ALS), the Center for X-ray Optics (CXRO) has built an end station suitable for LIGA. The ALS is an excellent source of radiation for this application. The CXRO, in close collaboration with Sandia National Laboratory and the Jet Propulsion Laboratory, has developed the other essential process steps of mask making, resist development, x-ray exposure, and electroplating. This technology provides a powerful tool for mass production and miniaturization of mechanical systems into a dimensional regime not accessible by traditional manufacturing operations. We will present several applications that exploit the characteristics of the LIGA process: the fabrication of magnetic laminations for a high precision stepping motor; miniature octopole lens for advanced e-beam lithography; high-aspect-ratio x-ray collimating grids for astronomy; and microscopic tumblers for nuclear security. {copyright} {ital 1996 American Institute of Physics.}
2007 Digest of the IEEE/LEOS Summer Topical Meetings, 2007
An overview of the laser ablation fabrication
Micro Total Analysis Systems 2000, 2000
... 1 reader Save reference to library · Related research. Optimization of Turn Geometries for Mi... more ... 1 reader Save reference to library · Related research. Optimization of Turn Geometries for Microchip Electrophoresis. Joshua I Molho, Amy E Herr, Bruce P Mosier, Juan G Santiago, Thomas W Kenny, Reid A Brennen, et al. in ...
Analytical Chemistry, 2001
Chip-based microcolumn separation systems often require serpentine channels to achieve longer sep... more Chip-based microcolumn separation systems often require serpentine channels to achieve longer separation lengths within a compact area. However, analyte bands traveling through curved channels experience an increased dispersion that ...
Spie Milestone Series, 1999
ABSTRACT A micromachined chopper has demonstrated modulation of coherent and incoherent light. Th... more ABSTRACT A micromachined chopper has demonstrated modulation of coherent and incoherent light. The chopper uses an electrostatically driven lateral micromotor to actuate a shutter plate across a through-substrate window. Test devices have been fabricated and exhibit operating frequencies ranging from 1 to 31 kHz and have stable deflection amplitudes of 400 micrometers . Further optimizations of the design are discussed.
Analytical chemistry, Jan 21, 2015
A planar, chip-based flow cell for UV-VIS absorbance detection in HPLC is presented. The device f... more A planar, chip-based flow cell for UV-VIS absorbance detection in HPLC is presented. The device features a micro-fabricated free-standing liquid core waveguide (LCW) capillary detection tube of long path length that is based on total internal reflection. We report on the linearity and calibration slope characteristics of lithographically produced LCWs with different interior/exterior geometries. 3D ray tracing was indispensable in modeling behavior in the more demanding geometries: multipath behavior may be intrinsic to these waveguides with consequent non-linearity. Fortunately, non-linearity in lithographically easy-to-produce waveguide geometries (such as with a flat, concave exterior and a round interior) is not as detrimental as might be initially expected. Experimental performance is predictably affected by the attainable surface quality of the LCW and efficient and reproducible coupling of the input light into the LCW.
Rev Sci Instr, 1996
Our objective is the fabrication of small high-precision parts using LIGA, which can be used in a... more Our objective is the fabrication of small high-precision parts using LIGA, which can be used in a variety of industrial applications. LIGA is a combination of deep x-ray lithography, electroplating, and replication processes that enables the fabrication of microstructures with vertical dimensions several millimeters high, lateral dimensions in the micrometer range, and submicron tolerances. On beamline 10.3.2, at the Advanced Light Source (ALS), the Center for X-ray Optics (CXRO) has built an end station suitable for LIGA. The ALS is an excellent source of radiation for this application. The CXRO, in close collaboration with Sandia National Laboratory and the Jet Propulsion Laboratory, has developed the other essential process steps of mask making, resist development, x-ray exposure, and electroplating. This technology provides a powerful tool for mass production and miniaturization of mechanical systems into a dimensional regime not accessible by traditional manufacturing operations. We will present several applications that exploit the characteristics of the LIGA process: the fabrication of magnetic laminations for a high precision stepping motor; miniature octopole lens for advanced e-beam lithography; high-aspect-ratio x-ray collimating grids for astronomy; and microscopic tumblers for nuclear security. {copyright} {ital 1996 American Institute of Physics.}