This article proposes a plasmonic resonance-based optical nanoantennas geometry, called multipolarized, for the use of infrared sensors on focal plane array (FPA) substrates. The fabricated nanoantennas with electronbeam lithography and their determined resonance frequency through infrared spectroscopy and finite element simulation are the results presented in this work. We present a strategy for designing and fabricating nanoantennas with high performance and sensitivity for infrared sensors. The proposed multipolarized nanoantenna geometry can be used in plan array sensors for thermal imaging detection, providing high performance and sensitivity in the infrared range.
In this work, Surface-enhanced Raman Scattering had been applied to detect L-Asparagine. The presence of this amino acid in tissues and fluids helps to the prevalence of acute lymphoblastic leukemia cells and promotes the proliferation of metastasis for some other malignant tumors; depletion of L-Asparagine is up to date the best treatment for leukemia and could improve the prognosis for other cancers. We have carried out the preparation and characterization of two types of metallic surfaces, one with nanoparticles and the other one with nanostructures; we obtained and compared the SERS spectra and enhancement factors between them to emphasize the advantages in each one. The principal aim of this work is to establish the basis for a new reliable biosensor capable of being used in clinical applications.
A century has gone by since antennas were used for the first time to control emission and reception of many types of electromagnetic radiation. The reescalation of antennas to smaller sizes and the need of on a chip devices motivated the manufacture of the so called nano-antennas that can focus farther than the diffraction limit. It is well known that metallic particles sustain resonance plasmonic modes in visible wavelengths, making them natural optic antennas. As happened with the conventional radiative antennas, nowadays it is important to characterize the radiation pattern emitted by these nano-antennas. In this research, we pretend to characterize at least qualitatively the dynamic behavior of super paramagnetic nanoparticles by exposing them to an electromagnetic field generated by excited nano-antennas of the bowtie type. We use a confocal microscope since it is a technique that increases the contrast of an image by using a pinhole that obstructs the light that is out of the focal plane. This results in a system that not only discriminates field of view over the focal plane, but it also permits depth selection inside of the specimen under observation.
We compared 9 × 9 arrays of bimetallic Ni(Nickel)-Pt(Platinum) nanoantennas for a classic and evolutive dipole configuration. We fabricated the nanoantennas by e-beam lithography and characterized them with a solar simulator to analyze the I − V curves. From these curves, a thermoelectric voltage dependence associated by classic and evolutive dipole configuration was observed. We show that the evolutive dipole nanoantennas (EDN) generate up to three times more voltage in contrast with the classic dipole nanoantenna (CDN). Indeed, the evolutive configuration is 1.3 times more efficient than its classical counterpart. The results are corroborated by absorbance of these nanoantennas in the 20 to 36 THz range, where EDN is 40% more efficient than CDN and 30% in the range of 36.1 to 90 THz. Moreover, the experimental results match the thermoelectric behavior obtained using numerical simulations. The EDN can be used in applications ranging from aerospace technology to energy harvesting, photodetector, and sensors, where high thermoelectric efficiency is needed.
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