The French Atomic Energy Commission's Electronics and Information Technology Laboratory (CEA-Leti) has developed a prototype of the next generation of optical chemical sensors using mid-infrared silicon photonics technology that can be integrated into smartphones and other portable devices. Mid-infrared chemical sensors operate at a spectral range of 2.5 to 12 um and are considered to be at the forefront of innovative silicon photonic devices. In less than a decade, chemical sensing has become one of the key applications for these devices due to the growing potential of spectroscopy, materials processing, chemical and biomolecular sensing, and safety and industrial applications. Measurements in the mid-infrared spectral range provide highly selective, highly sensitive and unambiguous chemical identification. CEA-Leti's coin-sized on-chip sensor prototype combines high performance with low power consumption and is ready for IoT applications for a variety of consumer applications, such as smart home and vehicle air quality monitoring. And wearable health apps, and more. Its industrial uses include real-time air quality monitoring and extensive worker safety applications. Mid-infrared optical sensors currently on the market are typically bulky and expensive. At the same time, miniaturized and inexpensive sensors are unable to meet the accuracy, selectivity and sensitivity requirements of consumer applications. While size and price are not the most critical issues for industrial applications, bulky and expensive optical sensors are a major obstacle to consumer applications because consumer applications require wearables and integration in a variety of portable devices. “The mid-infrared silicon photonics technology has built a new class of integrated components that enable chip-level integration of the main building blocks required for chemical sensing,†says Sergio Nicoletti. Nicoletti is the first author of the paper "Crystal Infrared Sensor Miniaturization: Challenges and Prospects" published by CEA-Leti at SP19 Photonics West 2019. CEA-Leti's breakthrough combines three existing technologies required to fabricate on-chip optical chemistry sensors: integrated mid-infrared lasers on silicon; development of photonic integrated circuits (PIC) in the mid-infrared wavelength range; and silicon glazing Miniaturization of acoustic detectors. “Although other R&D efforts have yielded similar results, the main achievement of our project is the adoption of equipment and processes typical of the IC and MEMS industries,†Nicoletti said. “Our focus on architecture and process selection, and a series of steps. The specific link is also critical to the development of this optical chemical sensor, which CEA-Leti has now implemented as a demonstration prototype."
Elemental is a pure substance composed of
the same element. The state in which an element exists in its elemental form is
called the free state of the element. In general, the properties of elemental
matters are closely related to the properties of their elements, especially
chemical properties. For example, many metals are very metallic, then their
elemental reducibility is very strong. The elementality of different types of
elements, the difference in their properties is most prominently reflected in
the structure. In contrast to elemental matter, pure substances composed of
multiple elements are called compounds.
The element must be a pure substance composed of one element, so the mixture cannot be elemental. An element may have several elements, such as oxygen (O₂), ozone (O₃), tetrameric oxygen (O₄, a new type of oxygen molecule synthesized by a scientist in Italy), and red oxygen (O₈). Although any of these substances is elemental because they are pure substances composed of the same element, oxygen and ozone mixed together cannot be regarded as pure, it is a mixture of the same elements. In general, the properties of elementality are closely related to the properties of its elements. For example, many metals are very strong in nature, then their elemental reducibility is very strong. The elementality of different types of elements, the difference in their properties is most prominently reflected in the structure.
Elementary Substance,The Simple Substance, Pure Substance,Single Substance WUHAN RUISUNNY CHEMICAL CO. LTD , https://www.ruisunny-chem.com