EMI Grid Design

II-VI Optical Systems designs and manufactures EMI-shielded windows that are made to provide the optimal balance between optical transmission and RF shielding. These shielded windows provide protection against disruptive/damaging RF energy to assist in meeting MIL-STD-461 radiated emissions (RE) and susceptibility (RS) requirements.

II-VI Optical Systems has the capability to design EMI-shielding layers to meet requirements for:

  • Shielding efficiency
    • Across all typical frequency ranges
  • Optical transmission
    • Across all typical wavelength ranges and angles of incidence
  • Diffraction effects
    • To minimize effects of diffracted energy

This engineering capability allows II-VI Optical Systems to:

  • Model all common grid architectures (square, hub-and-spoke, overlapping circles) as well as transparent conducting oxide films and semiconductor windows (Si, Ge).
  • Quantitatively define the critical design trade-offs for optical transmission versus EMI shielding for a specific application.
  • Design an overall window configuration to maximize performance as well as manufacturability.

Depending on the application and wavebands of interest, II-VI Optical Systems will assist customers in determining whether a semiconductor substrate, transparent conductive oxide, or metallic grid approach is best suited for the particular system. In general, for broad optical wavebands and/or low frequency EMI, a thin-film metallic grid structure is the optimal choice for EMI protection.

Taken together with its sister company, MLA, II-VI Optical Systems has the manufacturing capability to cost-effectively produce EMI-shielded windows for any of the three basic protective configurations.