Mr. Bryan J. Norton Profile

Bryan J. Norton

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Publications (4)

Proceedings Article | 26 April 2016 Presentation

Laser dosimetry for disabling anopheles stephensi mosquitoes in-flight (Conference Presentation)

Matthew Keller, Bryan Norton, Phil Rutschman, David Farrar, Maclen Marvit, Artyom Makagon

Proceedings Volume 9706, 97060U (2016) https://doi.org/10.1117/12.2213217

KEYWORDS: Visible radiation, Near infrared, Tissue optics, Pulsed laser operation, Optical tracking, Current controlled current source

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SPIE Journal Paper | 3 September 2013 Open Access

Analytical approaches for determining heat distributions and thermal criteria for infrared neural stimulation

Bryan Norton, Meghan Bowler, Jonathon Wells, Matthew Keller

JBO, Vol. 18, Issue 09, 098001, (September 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.9.098001

KEYWORDS: Tissue optics, Tissues, Thermography, Temperature metrology, Biological research, Diffusion, Infrared radiation, Capacitance, In vivo imaging, Convolution

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Proceedings Article | 15 February 2013 Paper

Green’s function representation of laser induced thermal dynamics and determination of thermal criteria for optically induced neural activation

Bryan Norton, Meghan Bowler

Proceedings Volume 8579, 857908 (2013) https://doi.org/10.1117/12.2007059

KEYWORDS: Technetium, Tissue optics, Tissues, Thermography, Diffusion, Nerve, Infrared radiation, Neurons, Real-time computing, Pulsed laser operation

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Proceedings Article | 24 November 2005 Paper

Generation and manipulation of multi-cycle terahertz pulses via optical rectification in poled lithium niobate

Yun-Shik Lee, N. Amer, W. Hurlbut, B. Norton, J. Danielson

Proceedings Volume 6002, 600211 (2005) https://doi.org/10.1117/12.630019

KEYWORDS: Terahertz radiation, Crystals, Nonlinear crystals, Pulse shaping, Frequency conversion, Lithium niobate, Picosecond phenomena, Femtosecond phenomena, Absorption, Molecules

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We demonstrate control of terahertz (THz) waves developing novel devices in the THz regime: THz pulse shapers. THz technology is a relatively unexplored subject, yet the importance of THz wave manipulation cannot be emphasized enough considering its potential application to THz imaging systems, ultrafast optical signal processing, ultrahigh-speed computing, quantum information science, nanotechnology, and chemical reaction dynamics among other areas. THz time-domain spectroscopy (THz-TDS) can assess the performance of the THz pulse shapers monitoring time-dependent THz wave propagation. THz-TDS permits precise measurements not only of the amplitude but also of the phase of THz waves, thus a comprehensive assessment of the THz devices can be achieved. The phase sensitivity is also vital to many applications such as high-contrast THz imaging and quantum control of semiconductor nanostructures. We develop arbitrary THz pulse generators synthesizing THz waveforms via optical rectification in pre-engineered domain structures of poled nonlinear crystals using femtosecond lasers. The terahertz waveforms coincide with the crystal domain structures. The one dimensional nonlinear wave equation simulates the experimental results with a good qualitative agreement. The ratio of the domain length to the optical pulse length in the crystal turns out to be the crucial limiting factor to generating optimum terahertz fields and preventing waveform distortion. Optical pulse shaping techniques is integrated into the THz pulse generators to extend the scope of THz pulse shaping control. Continuously tunable narrow-band THz pulses are generated in a fanned-out periodically-poled lithium niobate crystal. We measure the free induction decay of rotational transitions in gas-phase HCl molecules using the narrow-band THz pulses. The shape of the multi-cycle THz pulses is controlled by adjusting the relative time delay and intensity between the two optical pulses.

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