Metamaterial
Engineered materials that manipulate waves through designed structure.
A metamaterial is an engineered material whose properties arise not from the chemical composition of its base substances, but from their deliberately designed internal structure. These properties are often rare or absent in naturally occurring materials. Metamaterials are typically fashioned from multiple materials, such as metals and plastics, and arranged in repeating patterns at scales smaller than the wavelengths of the phenomena they influence. Their shape, geometry, size, orientation, and arrangement give them the ability to manipulate electromagnetic, acoustic, or seismic waves by blocking, absorbing, enhancing, or bending waves, achieving benefits beyond what is possible with conventional materials. Metamaterial research is interdisciplinary, involving fields such as electrical engineering, electromagnetics, classical optics, solid state physics, and material sciences.
- field
- Engineered materials, electromagnetics, acoustics, optics
- known_for
- Manipulating waves via internal structure, negative refractive index, potential for super-lenses and invisibility
Lore & Background
Explorations of artificial materials for manipulating electromagnetic waves began at the end of the 19th century. Karl Ferdinand Lindman studied wave interaction with metallic helices as artificial chiral media in the early twentieth century. In the late 1940s, Winston E. Kock from AT&T Bell Laboratories developed materials with similar characteristics. In the 1950s and 1960s, artificial dielectrics were studied for lightweight microwave antennas, and microwave radar absorbers were researched in the 1980s and 1990s. Guerra fabricated a sub-wavelength transparent grating and coupled it with a microscope objective to resolve a grating in silicon, achieving super-resolution. David R. Smith et al.
Reader's Guide
Metamaterials represent a paradigm shift in material science, where function is derived from structure rather than chemistry. Their significance lies in their ability to achieve properties—such as negative refractive index—that are rare or absent in nature, enabling control over electromagnetic, acoustic, and seismic waves in ways previously impossible. This has opened potential applications ranging from super-lenses that can resolve beyond the diffraction limit to invisibility cloaks, improved ultrasonic sensors, and even shielding structures from earthquakes. The field is inherently interdisciplinary, drawing on electrical engineering, optics, solid state physics, and nanoscience. Recent developments also show promise for metamaterials in optical computing, with systems theoretically able to perform certain tasks more efficiently than conventional computing. The legacy of metamaterials is ongoing, with contemporary researchers classifying the realm into electromagnetic/optical wave metamaterials, other wave metamaterials, and diffusion metamaterials, each governed by distinct equations and metrics.
Did You Know?
- The word 'metamaterial' comes from the Greek word 'meta' (meaning 'beyond' or 'after') and the Latin word 'materia' (meaning 'matter' or 'material').
- Acoustic metamaterials can exhibit negative refraction, analogous to electromagnetic metamaterials.
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