The role of fibonacci sequence in the transport of Bose-Einstein condensate atoms in optical lattices

P. Vignolo, Z. Akdeniz, and M. P. Tosi recently have investigated the mixture of 87Rb and 40K atoms under a Bose-Hubbard tight-binding model. In their work, 40K atoms that are localized in various configurations inside the lattice wells alter the lattice potential. They have evaluated the transport of 87Rb atoms driven by a constant force in a quasi-one-dimensional lattice. More recently, Y. Eksioglu, P. Vignolo, and M. P. Tosi have used the same model to calculate the transport of 87Rb atoms driven by a constant force through Fibonacci array of potential wells. In this presentation, we extended the previous works to deal the dependence of the site number effects on the transmittivity of the 87Rb atoms of the boson-fermion mixture in a quasi-periodic lattice. We then discuss the results obtained by altering the site number of the potential in the Fibonacci sequence

Multi-Band Plasmonic Platform Utilizing UT-Shaped Graphene Antenna Arrays

Cetin, Arif E./0000-0002-0788-8108WOS: 000431971500042In this work, we introduce a plasmonic platform based on UT-shaped graphene antenna arrays. the proposed multi-resonant platform shows three different resonances, which can be independently tuned. the physical origin of these modes is shown with finite-difference time-domain (FDTD) nearfield distribution analyses, which are used to statically tune each resonance wavelength via the geometrical parameters, corresponding to different nearfield localization. We achieve statistical tuning of multiple resonances also by changing the number of graphene layers. Another static tuning of the optical response of the UT-shaped graphene antenna is achieved via the chemical potential and the relaxation time.Istanbul Kemerburgaz University Scientific Research Foundation [PB2016-I-012]Yasa Eksioglu acknowledges the support of Istanbul Kemerburgaz University Scientific Research Foundation project No: PB2016-I-012

Plasmonic Nanohole Arrays on a Robust Hybrid Substrate for Highly Sensitive Label-Free Biosensing

Plasmonic nanohole arrays have received significant attention, as they have highly advantageous optical properties for ultrasensitive and label-free biosensing applications. Currently, most of these subwavelength periodic apertures are mainly implemented on transparent materials, which results in multiple spectrally close transmission resonances. However, this spectral characteristic is not ideal for biosensing applications, as it complicates monitoring spectral variations. In this article, utilizing a hybrid substrate composed of a high refractive index dielectric interlayer over a transparent material, we show that gold nanohole arrays support spectrally isolated and well-defined plasmonic resonances that are easy to track. Compared to conventional configurations on transparent material, nanoholes on a hybrid substrate also exhibit plasmonic modes with well-preserved amplitudes, which is useful for reliable spectral monitoring. We show that nanohole arrays on a hybrid substrate are more sensitive to changes in surface conditions. Using a spectral integration method, which evaluates wavelength shifts in a large spectral window instead of monitoring only the plasmonic resonance wavelength, we obtain a detection limit as low as 2 x 10^(-5) RIU. Furthermore, we successfully demonstrate real-time monitoring of biomolecular binding interactions even at sub-1 ng/mL levels