Silicon photonics is now considered the photonics platform of choice for short-reach data center single mode pluggable transceivers. With the emergence of co-packaged optics concepts, it can also enable high performance computing with power-efficient interconnect, but also Lidar system integration or even optical quantum computing. In this paper we will present an overview of what can be achieved in state-of-the-art silicon photonics platforms and we will discuss some of the emerging technology trends. In particular, we will discuss the integration of LPCVD SiN in an active silicon photonics platform.
This paper presents the necessary building blocks towards the realization of on-chip, lens-free, spectrally selective, THz beam steering. We demonstrate continuous wave (CW) THz generation up to 2.2 THz by photomixing using antenna-coupled silicon-integrated germanium photodiodes, which reach an optical-to-THz conversion efficiency of about 1% at 100 GHz. We show THz beam forming within a small antenna array and address key challenges towards the realization of large quasi-optical THz phased arrays, by demonstrating low-loss (<0.2 dB/cm), low phase error routing and optical beam steering within hybrid Si/SiN optical phased arrays. Finally, we present an anti-reflection structure enabling lensfree THz beam steering.
Terahertz (THz) imaging has progressed tremendously due the continuous development of new THz emitters and detectors. However, highly integrated array devices are desired for fast THz imaging. Advanced features such as beam steering and phase contrast imaging may be realized using more complex systems that require tight integration. Silicon photonics is an enabler for CW THz applications such as imaging and high-speed communication because of low cost and high level of integration. We present results of our research on continuous-wave THz generation using antennacoupled silicon-germanium photodiodes. THz emission up to 2.2 THz has been demonstrated.
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