Search

ISBN: 978-162841713-5 CODEN: PSISD Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited., Fractal antennas have been proposed to improve the bandwidth of resonant structures and optical antennas. Their multiband characteristics are of interest in radiofrequency and microwave technologies. In this contribution we link the geometry of the current paths built-in the fractal antenna with the spectral response. We have seen that the actual currents owing through the structure are not limited to the portion of the fractal that should be geometrically linked with the signal. This fact strongly depends on the design of the fractal and how the different scales are arranged within the antenna. Some ideas involving materials that could actively respond to the incoming radiation could be of help to spectrally select the response of the multiband design., Ministerio de Economia y Competitividad (MINECO), Centro Mexicano de Innovación en Energía Solar from Fondo Sectorial CONACYT-Secretaría de Energía Sustentabilidad Energética, National Laboratory program from CONACYT through the Terahertz Science and Technology National Lab (LANCYTT), Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

ISBN: 978-162841713-5 CODEN: PSISD Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited., The practical application of optical antennas in detection devices strongly depends on its ability to produce an acceptable signal-to-noise ratio for the given task. It is known that, due to the intrinsic problems arising from its sub-wavelength dimensions, optical antennas produce very small signals. The quality of these signals depends on the involved transduction mechanism. The contribution of different types of noise should be adapted to the transducer and to the signal extraction regime. Once noise is evaluated and measured, the specific detectivity, D*, becomes the parameter of interest when comparing the performance of antenna coupled devices with other detectors. However, this parameter involves some magnitudes that can be defined in several ways for optical antennas. In this contribution we are interested in the evaluation and comparison of D_ values for several bolometric optical antennas working in the infrared and involving two materials. At the same time, some material and geometrical parameters involved in the definition of noise and detectivity will be discussed to analyze the suitability of D_ to properly account for the performance of optical antennas., Ministerio de Economia y Competitividad (MINECO), Centro Mexicano de Innovación en Energía Solar from Fondo Sectorial CONACYT-Secretaría de EnergíaSustentabilidad Energética, National Laboratory program from CONACYT through the Terahertz Science and Technology National Lab (LANCYTT), Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub

ISBN: 978-162841713-5 CODEN: PSISD Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited., One of the main technical difficulties in the fabrication of optical antennas working as light detectors is the proper design and manufacture of auxiliary elements as load lines and signal extraction structures. These elements need to be quite small to reach the location of the antennas and should have a minimal effect on the response of the device. Unfortunately this is not an easy task and signal extraction lines resonate along with the antenna producing a complex signal that usually masks the one given by the antenna. In order to decouple the resonance from the transduction we present in this contribution a parametric analysis of the response of a bolometric stripe that is surrounded by resonant dipoles with different geometries and orientations. We have checked that these elements should provide a signal proportional to the polarization state of the incoming light., Ministerio de Economia y Competitividad (MINECO), Centro Mexicano de Innovacin en Energa Solar from Fondo Sectorial CONACYT-Secretara de EnergaSustentabilidad Energtica, National Laboratory program from CONACYT through the Terahertz Science and Technology National Lab (LANCYTT), Sección Deptal. de Óptica (Óptica), Fac. de Óptica y Optometría, TRUE, pub