Generation of high-average-power ultra-broadband infrared radiation

All-Silicon Ultra-Broadband Infrared Light Absorbers

Absorbing infrared radiation efficiently is important for critical applications such as thermal imaging and infrared spectroscopy. Common infrared absorbing materials are not standard in Si VLSI technology. We demonstrate ultra-broadband mid-infrared absorbers based purely on silicon. Broadband absorption is achieved by the combined effects of free carrier absorption, and vibrational and plasmo...

An Ultra-Low Power, Radiation Tolerant, High Speed Correlator

A digital high-speed cross-correlator (HSCC) has been developed for use in a microwave polarimetry instrument. The HSCC incorporates radiation tolerant circuit design and an ultra-low power CMOS process. In order to meet the very high input data requirement of 500 megasamples per second the correlator architecture was partitioned into different sections, each with its own trade-off requirements...

Theory of low-power ultra-broadband terahertz sideband generation in bi-layer graphene

In a semiconductor illuminated by a strong terahertz (THz) field, optically excited electron-hole pairs can recombine to emit light in a broad frequency comb evenly spaced by twice the THz frequency. Such high-order THz sideband generation is of interest both as an example of extreme nonlinear optics and also as a method for ultrafast electro-optical modulation. So far, this phenomenon has only...

Ultra-broadband near-infrared excitable upconversion core/shell nanocrystals.

Monodisperse Er(3+):NaGdF(4)@Ho(3+):NaGdF(4)@NaGdF(4) active-core/active-shell/inert-shell nanocrystals, which can extend the near-infrared wavelength excitable range for upconversion (UC) emissions, were successfully fabricated for the first time. Importantly, doping of Er(3+) and Ho(3+) into the core and shell respectively suppresses adverse energy transfers between them, resulting in intense...

High-contrast, all-silicon waveguiding platform for ultra-broadband mid- infrared photonics