Bulletin of the American Physical Society
Joint Fall 2017 Meeting of the Texas Section of the APS, Texas Section of the AAPT, and Zone 13 of the Society of Physics Students
Volume 62, Number 16
Friday–Saturday, October 20–21, 2017; The University of Texas at Dallas, Richardson, Texas
Session B9: Optics I |
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Chair: Alex Zakhidov, Texas State San Marcos Room: JSOM 1.212 |
Friday, October 20, 2017 2:45PM - 3:09PM |
B9.00001: Evaluation of the diabetic foot deterioration by THz imaging ... and other applications Invited Speaker: Prof. Enrique Castro Camus In this talk I will give a general overview on the field of terahertz spectroscopy with particular emphasis on time-domain spectroscopy. I will then talk about a recent study in which we used this emerging technology for the early diagnosis of the deterioration of feet of diabetic patients. In addition I will speak about a number of other studies in which we have targeted problems in physics, chemistry, biology, medicine and even in the study of art pieces and other culturally valuable objects. [Preview Abstract] |
Friday, October 20, 2017 3:09PM - 3:21PM |
B9.00002: In-fiber polarization dependent meta-color filter Indra Ghimire, Sudip Gurung, Satyendra K Mishra, Ho Wai Howard Lee Periodic metallic nanostructures exhibit plasmonic resonance that convert the incident optical light into two-dimensional surface propagating charge density waves (surface plasmon polaritons). These patterned metal films enable enhanced transmission at the plasmonic resonance, leading an important property to use them as ultra-compact transmission color filter. In this study, we further integrate the plasmonic nanostructure into conventional optical fiber to demonstrate an in-fiber plasmonic color filter. Meta-structures are fabricated on the core of the fiber facet by focus ion beam milling. Asymmetric negative cross meta-structures with different lengths of each perpendicular arm of 580 nm and 480 nm are fabricated. Using a broadband super continuum laser as a light source for transmission measurements, we observe distinct transmission peaks at wavelength of 1390 nm and 1670 nm for horizontal and vertical polarization respectively. The splitting of the transmission peaks for different polarization is resulted from the plasmonic resonance of the asymmetric cross structure. The nanostructured optical fibers have many potential applications, for example, as in-fiber color filters/splitters, polarization convertors, and in-fiber optical and biophotonic sensors. [Preview Abstract] |
Friday, October 20, 2017 3:21PM - 3:33PM |
B9.00003: Locking a probe laser beam on a dielectric surface using a stronger coupling laser Cristian Bahrim, Nurul Azam We propose an experimental method for locking a probe laser on the dipoles of a dielectric glass surface. Our configuration creates an Electromagnetic Induced Transparency (EIT)-like environment, where the interaction between light and matter takes place at the surface of a solid insulating material, instead of deep inside a gaseous medium, as is typically the case in EIT experiments. EIT allows through quantum destructive interference between a weak probe laser beam and a stronger coupling laser beam to slow down the probe laser. In our experiments, we observe that in the presence of a stronger coupling laser, the probe laser forms an interference pattern, with evenly spaced minima of interference in the reflectance measured in the Brewster angle region. Also, a maximum (instead of a minimum as suggested by Brewster's law) appears at the Brewster angle due to a stronger interaction of the dielectric dipoles with a coupling laser beam. The influence of a capacitor voltage which is set up across the dielectric surface on the interference pattern is carefully analyzed. A possible application of this research is in developing optoelectronic switching devices and optical quantum memory. [Preview Abstract] |
Friday, October 20, 2017 3:33PM - 3:45PM |
B9.00004: Experimental Demonstration of Epsilon-Near-Zero Perfect Absorber in Ultra-Thin Films Catherine Arndt, Aleksei Anopchenko, Long Tao, Ho Wai Howard Lee There is a significant interest in the development of ultra-thin optical absorbers, which may lead to the potential of layered broadband absorbers. Ultra-thin (\textless 100 nm) Indium Tin Oxide (ITO) layers support certain radiative and bound p-polarized plasmonic modes at epsilon-near-zero (ENZ) frequencies. Excitation of the radiative Berremen mode leads to perfect absorption in the near-IR spectrum. By utilizing these properties, we demonstrate perfect absorption (\textgreater 99{\%}) in \textless 15nm thick films. ITO nanolayers are deposited by RF sputtering at elevated temperatures to control their electron concentration and ENZ frequency on top of a thick gold layer. A super continuum laser (600-1700 nm) excites the Berreman mode of the ultra-thin ITO layer. The specular reflection from the sample is collected, revealing \textgreater 99{\%} absorption in the near-IR spectrum. We also demonstrate that perfect absorption of single layer ultra-thin films could be layered to create a broadband absorber. Layers of ITO with varying ENZ wavelengths are deposited on top of a thick gold layer. The perfect absorption in ultra-thin layers confirms the possibility of a multi-layered broadband perfect absorber. [Preview Abstract] |
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