Wide-band circular polarized cross bowtie antenna in LWIR
| Autor: | Shenjie Miao, Yuancheng Xu, Navaneeth Premkumar, Brian A. Lail |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Electromagnetic field
Frequency response HFSS Terahertz radiation business.industry Detector Photodetector 020206 networking & telecommunications 02 engineering and technology 021001 nanoscience & nanotechnology Polarization (waves) Optics 0202 electrical engineering electronic engineering information engineering Center frequency 0210 nano-technology business Computer Science::Information Theory |
| Zdroj: | Infrared Technology and Applications XLIV. |
| DOI: | 10.1117/12.2303905 |
| Popis: | In recent years, plasmonic resonant antennas have seen widespread consideration in many detection and chemistry applications due to their potential for enhancing and confining the emission and polarization of electromagnetic fields. Examples include optical couplers to ultra-compact photodetectors, high-resolution optical microscopy, enablers of single molecule Raman signal detection and heating elements that facilitate nanostructure growth. An asymmetric cross-bowtie antenna is investigated for providing a broad circular polarized frequency response in the long wave infrared (LWIR). The asymmetric cross-bowtie antenna is constructed with two perpendicular bowtie antennas with differing arm lengths. The asymmetric cross-bowtie antenna is numerically analyzed using a finite element method (FEM) solver; Ansys High Frequency Structural Simulator (HFSS). The two perpendicular bowtie antennas, under illumination, provide a wide-band localized circularly-polarized field within a shared antenna feed-gap. At the center frequency of 28.3 THz (10.6μm), a circularly-polarized state over 30% bandwidth is achieved. The antenna is then loaded with a metal-oxide-metal diode in order to design a circularly polarized antenna-coupled detector. |
| Databáze: | OpenAIRE |
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