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Demonstration of an iron fluorescence lidar operating at 372 nm wavelength using a newly-developed Nd:YAG laser
10.1364/OL.42.002858 2017-07-17 We report on the development of a pulsed neodymium-doped yttrium aluminum garnet (Nd:YAG) laser operating at a 1116 nm wavelength. Because the third harmonic is within a few gigahertz of the 372 nm absorption line of iron, this laser system represents an alte... |
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Scanning holographic optical tweezers
10.1364/OL.42.002862 2017-07-17 The aim of this Letter is to introduce a new optical tweezers approach, called scanning holographic optical tweezers (SHOT), which drastically increases the working area (WA) of the holographic-optical tweezers (HOT) approach, while maintaining tightly focuse... |
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Control of exceptional points in photonic crystal slabs
10.1364/OL.42.002866 2017-07-17 Various ways of controlling the extent of the ring of exceptional points in photonic crystal slabs are investigated. The extent of the ring in photonic crystal slabs is found to vary with the thickness of the slab. This enables recovery of Dirac cones in open... |
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Generation of continuously rotating polarization by combining cross-polarizations and its application in surface structuring
10.1364/OL.42.002870 2017-07-17 In this study, we develop a simple but highly effective technique that generates a continuously varying polarization within a laser beam. This is achieved by having orthogonal linear polarizations on each side of the beam. By simply focusing such a laser beam... |
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Luminescence in germania–silica fibers in a 1–2 μm region
10.1364/OL.42.002874 2017-07-17 We analyze the origins of the luminescence in germania–silica fibers with high germanium concentration (about 30 mol.% GeO2) in the region of 1–2 μm with a laser pump at the wavelength 532 nm. We show that such fibers demonstrate the high level of luminescenc... |
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Whispering gallery germanium-on-silicon photodetector
10.1364/OL.42.002878 2017-07-17 We design and demonstrate, to the best of our knowledge, the first whispering gallery germanium-on-silicon photodetector with evanescent coupling from a silicon bus waveguide in a CMOS-compatible process. The small footprint (63.6 μm2), high responsivity (∼1.... |
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Mid-infrared germanium photonic crystal cavity
10.1364/OL.42.002882 2017-07-17 The mid-infrared (MIR) spectral range holds significant potential for spectroscopic and sensing applications because it encompasses the fingerprint region that unveils the vibrational and rotational signatures of molecules. CMOS-compatible on-chip devices tha... |
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Visibility of dielectrically passivated graphene films
10.1364/OL.42.002850 2017-07-14 The visibility of monolayer graphene is dependent on its surrounding dielectric environment and the presence of any contamination associated with 2D layer transfer. Here, the optical contrast of residually contaminated monolayer graphene encased within a rang... |
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Polarization-dependent strong coupling between surface plasmon polaritons and excitons in an organic-dye-doped nanostructure
10.1364/OL.42.002834 2017-07-14 In this work, we demonstrate polarization-dependent strong coupling between surface plasmon polaritons (SPPs) and excitons in the J-aggregates-attached aperture array. It is shown that the excitons strongly couple with the polarization-dependent SPPs, and Rab... |
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Polarization-dependent strong coupling between surface plasmon polaritons and excitons in an organic-dye-doped nanostructure
10.1364/OL.42.002834 2017-07-14 In this work, we demonstrate polarization-dependent strong coupling between surface plasmon polaritons (SPPs) and excitons in the J-aggregates-attached aperture array. It is shown that the excitons strongly couple with the polarization-dependent SPPs, and Rab... |