RESUMEN
This paper presents a single-pixel polarimetric compressive sensing (CS)-based direction of arrival (DoA) estimation technique using a cavity backed programmable coding metasurface aperture. The single-pixel DoA retrieval technique relies on a dynamically modulated waveform diversity, enabling spatially incoherent radiation masks to encode the incoming plane waves on the radar aperture using a single channel. The polarimetric nature of the wave-chaotic coded metasurface ensures that the DOA estimation is sensitive to the polarization state of the incoming waves. We show that the polarimetric single-pixel DoA concept can be realized by encoding the polarization information of the incoming waves at the physical layer level within the antenna. A dynamically reconfigurable wave-chaotic metasurface, which possesses a structured sparsity of dual-polarized coded metamaterial elements, is proposed for the proof of concept. It is shown that by encoding and compressing the source generated far-field incident waves into a single channel, we can retrieve high fidelity polarimetric DoA information from compressed measurements.
RESUMEN
A transparent electrode is an essential component that has a strong influence on the extraction of light from organic light-emitting diodes (OLEDs) due to its effect on both electrical and optical performance. In this work, we present theoretical studies, full wave simulations, and experimental results to evaluate the influence of the thickness of epsilon negative tri-metal layer (TML) electrodes on the performance of red phosphorescent OLEDs (PHOLEDs) via an optical microcavity effect. The results show that the external quantum efficiency of the optimized TML-based red PHOLED of 17.6% is significantly improved, and it is approximately 40% higher than that of the conventional indium tin oxide (ITO)-based red PHOLED of 12.5%.