Other research

L. Tong, J. Lou, and E. Mazur. 2002. “High-quality rectangular Y2O3- ZrO2 single-crystal optical waveguides for high- temperature fiber optic sensors.” In . Fiber Optic Sensor Technology and Applications 2001. Publisher's VersionAbstract
High quality Y2O3-ZrO2 single crystal rectangular waveguides had been developed for high-temperature sensing applications. The waveguides were fabricated from bulky Y2O3 stabilized ZrO2 single crystal by precise cut and fine polish. Three rectangular waveguides with cross-section larger than 1mmx1mm and length of 45mm 65mm were obtained. They showed much better optical properties than Y2O3-ZrO2 single crystal fibers grown for fiber-optic sensing in previous work, optical losses of these waveguides were lower than 0.03dB/cm at wavelength of 900nm, and they were able to endure temperature as higher as 2300 degree(s)C. All of them survived a 10g vibration test with average STF (strain to failure) of about 0.25%. Experimental results show that, these waveguides are promising for fiber-optic sensing for temperature above 2000 degree(s)C.
D. S. Chung, K. Y. Christina Lee, and E. Mazur. 1988. “Light scattering from nonequilibrium interfaces.” Int. J. of Thermophysics, 9, Pp. 729–737. Publisher's VersionAbstract
The asymmetry of the two Brillouin peaks of light scattered from capillary waves on a water-nitrogen interface subject to a temperature gradient has been observed using a Fourier transform heterodyne technique. The local oscillator is frequency-shifted by a few kHz to separate the Stokes and anti- Stokes components. Although the sign and the order of magnitude of the effect agree with linear theory, the magnitude of the experimental asymmetry is about one half of the one predicted by linear fluctuating hydrodynamics. Key Words: capillary wave, heterodyne, nonequilibrium interface, surface light scattering, water
T. Her, R. J. Finlay, C. Wu, S. Deliwala, and E. Mazur. 1998. “Microstructuring of silicon with femtosecond laser pulses.” Appl. Phys. Lett., 73, Pp. 1673–1675. Publisher's VersionAbstract
We report that silicon surfaces develop an array of sharp conical spikes when irradiated with 500 laser pulses of 100-fs duration, 10-kJ/m2 fluence in 500-torr SF6 or Cl2. The spikes are up to 40-m tall, and taper to about 1-m diameter at the tip. Irradiation of silicon surfaces in N2, Ne, or vacuum creates structured surfaces, but does not create the sharp conical spikes.
E. Mazur. 1988. “The interaction of intense picosecond infrared pulses with isolated molecules.” In Atomic and Molecular Processes with Short Intense Laser Pulses, edited by A. D. Bandrauk, Pp. 329–336. Plenum. Publisher's VersionAbstract
In the Past decade there has been much interest in the dynamics of highly vibrationally excited and dissociating molecules. Selectivity at high levels of excitation may eventually lead to the realization of laser-controlled photochemistry, with broad applications in such diverse areas as laser- asisted chemical vapor deposition, isotope separation, and photosythesis. Polyatomic molecules in the ground electronic state can reach levels of excitation up to the dissociation threshold by absorbing a large number of photons from a resonant high-poewr infrared laser. Despite the selectivity of infrared excitation at low energy, however, at high excitation the excitation energy is no longer confined to one 'mode'. It has been shown experimentally that that for molecules excited close to or above the dissociation threshold equilibriation of energy occurs, in agreement with threoretical predictions. There is no agreement, however, as to the validity of theoretical models presuppose equipartitioning of energy in the region below the dissociation threshold. Recent spontaneous Raman spectroscopy experiments on infrared multiphoton excited molecules in our laboratory provide information on the intramolecular vibrational energy distributions of excess of energy can remain in the pumped mode up to levels of excitation close to the dissociation threshold. This paper provides a review of the results that were obtained in the past three years, part of which were published previously.
L. Tong, L. Ye, J. Lou, Z. Shen, Y. Shen, and E. Mazur. 2002. “Improved Y2O3-ZrO2 waveguide fiber optic sensor for measuring gas-flow temperature above 2000 degrees Celsius.” In . Fiber Optic Sensor Technology and Applications 2001. Publisher's VersionAbstract
AlthoughY2O3-ZrO2 fiber-optic sensor has been developed for contact measurement of temperature higher than 2000 degree(s)C, its performance is not as good as that of sapphire fiber-optic sensor below 1900 degree(s)C due to the large optical loss of the Y2O3-ZrO2 fiber. In order to improve the Y2O3- ZrO2 fiber-optic sensor for ultra-high-temperature applications, in this work, based on a newly developed rectangular Y2O3-ZrO2 single-crystal waveguide with much lower optical loss, an improved Y2O3- ZrO2 waveguide- fiber-optic sensor has been developed. The sensor has been tested up to near 2300 degree(s)C, we estimate that, the improved sensor has similar performance as the sapphire fiber-optic sensor in accuracy and resolution, except the disadvantage of relatively short waveguide. In addition, in this work, instead of the previous volatile and toxic BeO-coated probe, we use a multi-ions-doped sensor head, which is much stable and safe.
G. England, M. Kolle, P. Kim, M. Khan, P. Muñoz, E. Mazur, and J. Aizenberg. 2014. “Bioinspired micrograting arrays mimicking the reverse color diffraction elements evolved by the butterfly Pierella luna.” PNAS, Pp. –. Publisher's VersionAbstract
Recently, diffraction elements that reverse the color sequence normally observed in planar diffraction gratings have been found in the wing scales of the butterfly Pierella luna. Here, we describe the creation of an artificial photonic material mimicking this reverse color-order diffraction effect. The bioinspired system consists of ordered arrays of vertically oriented microdiffraction gratings. We present a detailed analysis and modeling of the coupling of diffraction resulting from individual structural components and demonstrate its strong dependence on the orientation of the individual miniature gratings. This photonic material could provide a basis for novel developments in biosensing, anticounterfeiting, and efficient light management in photovoltaic systems and light-emitting diodes.
D. Korff, E. Mazur, C. Duzy, and A. Flusberg. 1986. “Raman conversion using crossed broadband pump beams and bisecting Stokes.” J. Opt. Soc. Am. B, 3, Pp. 1333–1337. Publisher's VersionAbstract
The effects of stimulated Raman conversion under the conditions of crossed pump beams and a bisecting injected Stokes are examined. It is found that the beam quality of the emerging Stokes wave and the effective gain can be characterized by the following two parameters: the temporal coherence of the crossed pump beams and the angle between the pumps.
D. Rioux, S. Vallières, S. b. Besner, P. Muñoz, M. Meunier, and E. Mazur. 2013. “An Analytic Model for the Dielectric Function of Au, Ag, and their Alloys.” Advanced Optical Materials, Pp. –. Publisher's VersionAbstract
An analytical model for the prediction of the dielectric properties of gold– silver alloys is developed. This multi-parametric model is a modification of the usual Drude–Lorentz model that takes into account the band structure of the metals. It is fitted by a genetic algorithm to the dielectric function of thin alloy films of different gold–silver ratio obtained by ellipsometry. The model is validated for arbitrary alloy compositions by comparing the experimental extinction spectra of alloy nanoparticles with the spectra predicted by Mie theory.

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