IGNOU MPHE 27 2026 - What are single negative and double negative materials? Explain with t

Question

What are single negative and double negative materials? Explain with the help of a diagram, the characteristics of the propagation of electromagnetic waves through a double negative material.

19 Jan 2026

Answer :

Word Count : 267

Single negative materials are artificial or natural media in which only one of the fundamental electromagnetic parameters is negative. If the permittivity ε is negative while permeability μ is positive, the material is called epsilon-negative, as seen in plasmas and noble metals at optical frequencies. If μ is negative and ε is positive, the material is called mu-negative, which can be realized using engineered nanostructures such as split-ring resonators. These materials support unusual electromagnetic responses but do not allow normal wave propagation over a wide frequency range. Double negative materials, also known as negative index or

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