Generalized Brewster effect is a phenomenon where light of both TE (S-) and TM (P-) polarization transmit through a surface with no reflection for a particular incident angle. Generalized Brewster angle (GBA) in visible and near-infrared (NIR) wavelength region is very useful in many scientific and technical areas of applications. However, it is very rare to find a material having this effect as it demands both dielectric and magnetic response in that wavelength range and usually magnetic response is extremely weak in the optical wavelengths. Here we demonstrate the GBA effect of an anisotropic material composed of highly ordered high aspect ratio aluminium doped zinc oxide (AZO) nanopillar arrays. Along with the experimental demonstration, we also provide a proper numerical analysis to investigate the origin of this effect in the pillar array system which will be useful for many conventional as well as new applications in photonics including protein sensing.
Real time (label-free) detection and sizing of single protein molecule at its natural state is “holy grail” in biosensing
field. This non-destructive technique is useful for predicting the dangerous diseases at very early-stage. Herein, we
report the synthesis and characterization of efficient nanoplasmonic antennas, which could be useful to fabricate an
ultrasensitive nanoplasmonic-whispering gallery mode hybrid microresonator for the real time detection and sizing of
single protein molecule. This hybrid microresonator could be easily converted as an ultrasensitive single molecule
biosensor by anchoring suitable anti-bodies on the surface of the plasmonic nanoantenna.
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