This study proposes a new-fashioned plasmonic photoconductive antenna (PCA) with high optical-to-terahertz (THz) conversion efficiency. Finite element method was used to investigate and optimize the interaction of 800 nm femtosecond laser with the designed nanodisk array in the antenna's gap using its geometrical parameters. According to the simulation results, our optimized nanoplasmonic structure showed more than 38% enhancement in the absorption efficiency compared to the conventional structure without any nanostructure. Measuring the THz radiation of the fabricated PCAs using a time domain spectroscopy setup exhibited an exceptional 5.6 times higher electric field in 0.1–2.5 THz range compared to a similar PCA but without nanoplasmonic structure.

In recent years, the significant progress of organic-inorganic hybrid perovskite solar cells has surprised the photovoltaic community. Moreover, many other optoelectronic devices have been fabricated using this new generation of materials which makes it more attractive for researchers. Among different physical and chemical synthesis methods, we have taken on a two-step solution-based synthesis procedure to deposit CH₃NH₃PbI₃ with 1.55 eV energy band gap in ambient air condition. Various optoelectrical characterization tools have been used to thoroughly investigate the perovskite film quality. Simulations were carried out using Finite-Difference Time-Domain method (FDTD) for studying light absorption mechanism in perovskite films. Various surface roughness amounts were applied to the simulations to achieve a good consistency between experimental and theoretical absorption curves. This approach can give an insight into how surface roughness effectively impacts on the optical characteristics of the synthesized layer. Moreover, light absorption mechanism has been also investigated which demonstrates how light with a wavelength of more than 540 nm can be transmitted from a 400 nm thick perovskite layer. Simulations also illustrate how surface roughness can help light trapping in the perovskite layer.

Today, finding a low cost, efficient, functional and reliable solution for controlling smart lighting systems has become topic of many research groups and industry. In this study, a multi-functional wafer level package (WLP) for phosphor-based white LED system has been designed and manufactured using 7-mask BiCMOS process. This package integrates 4 high power blue LED dies with a temperature sensor and a blue selective light sensor for monitoring system performance. Each sensor has been designed, characterized and calibrated to be part of the smart monitoring unit. An interdigitated power transistor and a 4-bit flash analog-to-digital converter (ADC) were also monolithically integrated with sensors’ readout and extra controlling functions.

Given the performance decay of high-power light-emitting diode (LED) chips over time and package condition changes, having a reliable output light for sensitive applications is a point of concern. In this study, a light feedback control circuit, including blue-selective photodiodes, for blue/ultraviolet (UV) LED, has been designed and implemented using a low-cost seven-mask BiCMOS process. The feedback circuit was monolithically integrated in a package with four high-power blue LED chips. For sensing the intensity of exact colored blue/UV light in the package, selective photodiodes at 480-nm wavelength were implemented. An opamp-based feedback circuit combined with a high-power transistor controls the output light based on real-time sensor data. The whole system is a low-cost integrated package that guarantees a stable and reliable output light under different working conditions. Output light can be also controlled linearly by a reference input voltage.