Bulletin of the American Physical Society
Joint Spring 2011 Meeting of the New England Sections of the APS and the AAPT
Volume 56, Number 2
Friday–Saturday, April 8–9, 2011; Lowell, Massachusetts
Session F3: Materials, Optics |
Hide Abstracts |
Chair: Shiva Vangala, UMass Lowell Room: Olney Science Center 0-519 |
Saturday, April 9, 2011 8:00AM - 8:12AM |
F3.00001: Mid-Field Imaging of a Mid-Infrared Beaming Device David Adams, Sukosin Thongrattanasiri, Viktor Podolskiy, Daniel Wasserman We have experimentally measured the evolution of mid-infrared light at the exit side of a beaming device comprised of a subwavelength slit surrounded by a metallic grating. This device operates by coupling much of the light transmitted through the slit into surface waves which scatter off the ridges of the grating. Due to relatively large-scale dimensions afforded in the mid-infrared wavelength range, the subsequent beam evolution occurs over an appreciable distance (hundreds of microns). This has allowed us to image the emerging patterns which ultimately give rise to the far-field beam profile, and also to design geometries for control of the mid- and far-field beam evolution. [Preview Abstract] |
Saturday, April 9, 2011 8:12AM - 8:24AM |
F3.00002: ENZ-enhanced transmission through subwavelength slits Sandeep Inampudi, David Slocum, David C. Adams, Shivshankar Vangala, William D. Goodhue, Daniel Wasserman, Viktor A. Podolskiy We have performed a comprehensive analysis of the role of bulk ENZ (Epsilon near Zero) materials in the enhancement of light transmission through a subwavelength slit. We developed an analytical model capable of calculating the field distribution throughout the system. Our results show that the transmission enhancement is dominated by the plasma resonance of ENZ ``substrate'' layer. On the other hand, the transmission enhancement due to ENZ filling of the slit is often compensated by material absorption accompanying plasma resonance. [Preview Abstract] |
Saturday, April 9, 2011 8:24AM - 8:36AM |
F3.00003: Funneling Light Through a Subwavelength Aperture Using Epsilon Near Zero Materials David Slocum, David Adams, Sandeep Inampudi, Shiva Vangala, William Goodhue, Viktor Podolskiy, Daniel Wasserman We show enhanced light funneling through subwavelength features at optical frequencies using an Epsilon-Near-Zero (ENZ) metamaterial layer. Our metamaterial consists of highly doped InAsSb, grown by Molecular Beam Epitaxy on a semi-insulating GaAs substrate. The bulk optical properties of the material are characterized as well as transmission through a subwavelength slit filled with the ENZ material. For TM polarizations (electric field perpendicular to the slit), there is a peak in the transmission spectra at the ENZ frequency. As expected, this enhancement is not seen for TE polarizations or in samples without the ENZ epilayer. The experimental results are supported by numerical simulations of the structure. [Preview Abstract] |
Saturday, April 9, 2011 8:36AM - 8:48AM |
F3.00004: Polarization and Angle Dependent Spontaneous Emission Rates in Hybrid Metal-Semiconductor Nanostructures Yikuan Wang, Tianyu Yang, Mark Tuominen, Marc Achermann We are interested in exciton-plasmon interactions between semiconductor nanocrystals (NCs) and a gold nanodisc array. Using angle resolved white-light transmission spectroscopy we identified localized in- and out-of-plane surface plasmon (SP) resonances in the gold array. Upon depositing CdSe/ZnS (core/shell) NCs on the metal disc array, we measured photoluminescence (PL) decay rates of the NCs as a function of emission direction and polarization by time-correlated single photon counting technique. Since the wavelengths of the selected NCs matched the out-of-plane SP resonance wavelengths of gold array, the spontaneous emission of the NCs is strongly dependent on detection angles and polarizations. The in-plane, $s$-polarized PL measurements are independent on detection angles, and can be described by the PL decay dynamics of two NC subsets: from NCs on the dielectric substrate and from NCs on the gold nanodiscs that experience non-radiative quenching by the metal structures. The out-of-plane, $p$-polarized PL measurements show an increase of the PL amplitude and an accelerated PL decay, both caused by SP-induced enhancement of the spontaneous emission rate. [Preview Abstract] |
Saturday, April 9, 2011 8:48AM - 9:00AM |
F3.00005: Toothed Mid-Infrared Metal-Insulator-Metal Waveguides Kevin Anglin, David Adams, Troy Ribaudo, Daniel Wasserman We have fabricated both flat and toothed MIM waveguides for mid-IR frequencies and investigated transmission of these structures as a function of wavelength and periodicity. The transmission spectra of these structures for TM and TE polarized light is investigated and our results compared to numerical simulations, which mimic the coupling efficiency and incident k-vectors present in our experimental setup. A photonic bandgap is imposed on the transmission properties due to the periodic modulation of the MIM structure, and good agreement of passbands and stopbands was demonstrated between experimental data and numerical simulation. Control of the transmission passband frequency (specifically at longer wavelengths) is possible for these toothed structures by changing the period of the teeth. These structures offer potential for applications in chemical sensing, due to slow light propagation and high confinement of electric fields inside the waveguide. [Preview Abstract] |
Saturday, April 9, 2011 9:00AM - 9:12AM |
F3.00006: Sensitive detection of explosives via fluorescence quenching and pattern recognition technique Abhishek Kumar, Robinson Anandakathir, Jung Hwan Cho, Pradeep Kurup, Jayant Kumar There is significant interest in developing chemical sensors for detection of trace explosives. Optical sensors are inherently very sensitive and have potential to detect explosive vapors at room temperature and ambient conditions. There is a need to develop materials for optical sensors to fabricate a sensor array which can provide required sensitivity and selectivity. Here, we report an optical sensor array combined with pattern recognition technique for sensitive and selective detection of explosives. The optical sensor array consists of four conjugated polymers. These polymers have good quantum yield of fluorescence and large Stoke's shift. We have shown that by employing pattern recognition technique, the presence of nitro containing explosive TNT (2,4,6-trinitro toluene) can be discriminated with other common chemical intereferants in 60 seconds. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700