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Hassan Arbab

Senior Research Scientist/Engineer

Email

mharbab@apl.washington.edu

Phone

206-685-8225

Research Interests

Terahertz spectroscopy, Ultrafast photonics and femtosecond optics, Wavelet methods, Biomedical optics

Education

B.S. Electrical Engineering, Shahid Beheshti University, 2004

M.S. Electrical Engineering, University of Washington, 2008

Ph.D. (dual) Electrical Engineering and Nanotechnology, University of Washington, 2012

Publications

2000-present and while at APL-UW

Differentiation of burn wounds in an in vivo porcine model using terahertz spectroscopy

Osman, O.B., T.J. Tan, S. Henry, A. Warsen, N. Farr, A.M. McClintic, Y.-N. Wang, S. Arbabi, and M.H. Arbab, "Differentiation of burn wounds in an in vivo porcine model using terahertz spectroscopy," Biomed. Opt. Express, 11, 6528-6535, doi:10.1364/BOE.397792, 2020.

More Info

1 Nov 2020

The accuracy of current burn triage techniques has remained between 50–70%. Accordingly, there is a significant clinical need for the quantitative and accurate assessment of partial-thickness burn injuries. Porcine skin represents the closest animal model to human skin, and is often used in surgical skin grafting procedures. In this study, we used a standardized in vivo porcine burn model to obtain terahertz (THz) point-spectroscopy measurements from burns with various severities. We then extracted two reflection hyperspectral parameters, namely spectral area under the curve between approximately 0.1 and 0.9 THz (–10 dB bandwidth in each spectrum), and spectral slope, to characterize each burn. Using a linear combination of these two parameters, we accurately classified deep partial- and superficial partial-thickness burns (p = 0.0159), compared to vimentin immunohistochemistry as the gold standard for burn depth determination.

Phase function effects on identification of terahertz spectral signatures using the discrete wavelet transform

Khani, M.E., D.P. Winebrenner, and M.H. Arbab, "Phase function effects on identification of terahertz spectral signatures using the discrete wavelet transform," IEEE Trans. Terahertz Sci. Technol., 10, 656-666, doi:10.1109/TTHZ.2020.2997595, 2020.

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1 Nov 2020

We describe the application of the discrete wavelet transform (DWT) in extracting the characteristic absorption signatures of materials from terahertz reflection spectra. We compare the performance of different mother wavelets, including Daubechies, least asymmetric (LA), and Coiflet, based on their phase and gain functions and filter lengths. We show that the phase functions of the wavelet and scaling filters result in spectral shifts to the absorption lines in the wavelet domain. We provide a solution by calculating advancement coefficients necessary to achieve effective zero-phase-function DWT. We demonstrate the utility of this signal processing technique using α-lactose monohydrate/polyethylene samples with different levels of rough surface scattering. In all cases, the DWT-based algorithm successfully extracts resonant signatures at 0.53 and 1.38 THz, even when they are obscured by the rough surface scattering effects. The DWT analysis with accompanying phase corrections can be utilized as a robust technique for material identification in nondestructive evaluation using terahertz spectroscopy.

Terahertz time-domain polarimetry (THz-TDP) based on the spinning E-O sampling technique: Determination of precision and calibration

Xu, K., E. Bayati, K. Oguchi, S. Watanabe, D.P. Winebrenner, and M.H. Arbab, "Terahertz time-domain polarimetry (THz-TDP) based on the spinning E-O sampling technique: Determination of precision and calibration," Opt. Express, 28, 13,482-13,496, doi:10.1364/OE.389651, 2020.

More Info

27 Apr 2020

We have developed a terahertz time-domain polarimetry (THz-TDP) system by applying frequency modulation to electro-optic sampling detection in a nonlinear crystal. We characterized the precision of this system in determining the polarization angles to be 1.3° for fixed time delay, and 0.5° for complete time-domain waveform. Furthermore, we calculated the Jones matrix of the optical components used for beam propagation to calibrate the induced systematic error. The advantages of employing this calibration approach are demonstrated on a sapphire crystal investigated at different sample test positions in transmission configuration, and using high resistivity Si, AlN and quartz in reflection geometry. The new THz-TDP technique has the advantage of not using any external polarizers, and therefore is not constrained by their optical performance limitations, such as restricted bandwidths and frequency-dependent extinction ratio. Finally, the THz-TDP technique can be easily implemented on existing time-domain spectroscopy (TDS) systems.

More Publications

Inventions

Methods and systems for assessing a burn injury

The present invention provides methods, software, and systems for assessing a burn injury.

Patent Number: 9,295,402

Hassan Arbab, Antao Chen, Dale Winebrenner, Trevor Dickey, Pierre Mourad, Matthew Klein

Patent

29 Mar 2016

Terahertz spectroscopy of rough surface targets

Patent Number: 9,261,456

Hassan Arbab, Antao Chen, Eric Thorsos, Dale Winebrenner

More Info

Patent

16 Feb 2016

A method and system for analyzing noisy terahertz spectroscopy data transforms the measured time-dependent data into frequency space, for example, using a discrete Fourier transform, and then transforms the frequency spectrum into wavelet frequency space. The twice-transformed data is analyzed to identify spectroscopic features of the signal, for example, to identify a resonance frequency. The method may be used, for example, in a stand-off detector to identify particular chemicals in a target.

Method for Characterization of Superficial Wounds

Record of Invention Number: 45573

Hassan Arbab, Antao Chen, Dale Winebrenner, Trevor Dickey, Pierre Mourad, Matthew Klein

Disclosure

1 Apr 2011

More Inventions

Acoustics Air-Sea Interaction & Remote Sensing Center for Environmental & Information Systems Center for Industrial & Medical Ultrasound Electronic & Photonic Systems Ocean Engineering Ocean Physics Polar Science Center
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