MEMS: Definition, History and Salient Features

MEMS (Micro-Electro-Mechanical Systems) are miniaturized systems that integrate mechanical structures, sensors, actuators and electronic circuits, generally fabricated using microfabrication techniques on a small substrate such as silicon.

Brief history

• 1950s–60s: Development of semiconductor fabrication and silicon technology provided the foundation for miniaturized devices.
• 1960s: Early silicon pressure sensors and micromachined structures demonstrated practical MEMS concepts.
• 1970s–80s: Surface and bulk micromachining developed rapidly; accelerometers and other sensors became feasible.
• 1990s: MEMS accelerometers entered automotive airbag systems, while micromachined optical and fluidic devices expanded applications.
• 2000s onward: MEMS became widespread in smartphones, medical devices, inertial sensors, microphones, microfluidics and biomedical systems.

Salient features

1. Very small size and low mass.
2. Low power consumption.
3. Batch fabrication enables high-volume production.
4. Integration of mechanical and electronic functions.
5. High sensitivity and fast response.
6. Low material consumption.
7. Ability to integrate sensors, actuators and signal processing.
8. Applications across automotive, aerospace, healthcare, consumer electronics and industrial systems.

Conclusion: MEMS combines mechanical and electronic engineering at the microscale to create compact, sensitive and multifunctional devices.