MEMS AND ITS APPLICATIONS (PE – III) B.Tech. IV Year I Semester JNTUH R-18

• Explain the main differences between MEMS and Microsystems.

• Discuss the evolution of microfabrication technology and its impact on MEMS development.

• Provide examples of MEMS applications in various domains like optical devices, healthcare, aerospace, etc.

• Explain the working principles of different types of microsensors and microactuators (e.g., acoustic wave sensors, thermal actuators, electrostatic actuators).

• Describe the functionality and applications of common MEMS devices like microgrippers, micromotors, micropumps, and microaccelerometers.

Unit II: Materials for MEMS and Microsystems

• Compare and contrast the properties of silicon and other materials used in MEMS fabrication (e.g., GaAs, GaN, quartz, polymers).

• Discuss the advantages and limitations of using silicon as the primary substrate material for MEMS.

• Describe the role of piezoresistors in MEMS devices and their applications in sensing pressure and stress.

• Explain the potential benefits of using non-silicon materials for specific MEMS applications.

Unit III: Basics of Micromanufacturing

• Describe the basic steps involved in photolithography, including masking, exposure, and development.

• Explain the importance of maintaining a cleanroom environment for MEMS fabrication.

• Compare and contrast different deposition techniques like ion implantation, diffusion, various types of chemical vapor deposition (CVD), and oxidation.

• Discuss the principles of wet and dry etching techniques used in MEMS fabrication.

• Explain the importance of design considerations and process design in developing successful MEMS devices.

• Briefly describe the use of CAD tools for photomask layout design.

Unit IV: Fabrication of MEMS

• Compare and contrast bulk micromachining and surface micromachining techniques for MEMS fabrication.

• Explain the LIGA process and its unique capabilities for creating high-aspect-ratio microstructures.

• Discuss the application of Deep X-Ray Lithography (DXRL) in MEMS fabrication with high resolution.

Unit V: Characterization of MEMS

• Describe the working principles and operation of different characterization techniques like Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), Atomic Force Microscope (AFM), X-Ray Diffraction (XRD), and Optical Microscope.

• Explain the importance of these techniques in evaluating the physical, chemical, and functional properties of MEMS devices.

Bonus questions:

• Discuss the ethical considerations and potential challenges associated with advances in MEMS technology.

• Describe some emerging trends and future applications of MEMS in various fields.

• Briefly explain the concept of microfluidics and its role in MEMS devices.