NiSi

NiSi is a brand associated with photographic filters and filter systems used in still photography and video. NiSi Optics produces a range of optical filters, including neutral-density (ND) filters, circular polarizers (CPL), graduated filters, and holder systems for modular filter setups. The filters are designed to minimize reflections and color cast, with multi-coating schemes intended to improve transmission and durability. NiSi markets both round screw-in filters and square/holder configurations for professional rigs, and offers accessories such as filter cases and lens adapters. The brand has global distribution through authorized retailers and online channels.

Nickel silicide, abbreviated NiSi, is a chemical compound formed when nickel reacts with silicon at elevated temperatures. It is widely used in the microelectronics industry as a low-resistance contact material and diffusion barrier in silicon-based integrated circuits. NiSi can form in different crystalline phases, notably NiSi and NiSi2, whose properties depend on temperature and composition. The silicidation process typically involves depositing a nickel layer on silicon and annealing it to form a uniform, conductive interface, reducing contact resistance and enabling device scaling. Challenges include controlling phase formation, achieving uniform interfaces, and mitigating unwanted interfacial reactions during thermal processing, especially as device dimensions continue to shrink and performance demands increase.