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Series 4 · Chapter 4.3

The Materials Map

The functional layer can be built from a surprisingly long roster of materials, and knowing the roster is the fastest route to reading past marketing labels. Patent and manufacturing literature documents two families.

Sputtered materials — deposited as continuous layers:

  • Titanium nitride (TiN): a true ceramic compound with unusual optical behavior covered fully in Chapter 4.5; no signal interference; the flagship of non-metallic sputtered film.
  • Silver: excellent infrared reflection, but visibly reflective (mirror effect), corrosion-prone, and signal-interfering.
  • Nickel-chrome alloys: older, durable, less spectrally selective.
  • Gold: very stable, expensive, largely a specialty architectural material.
  • Aluminum: early-generation technology, largely superseded.
  • Stainless alloys: mid-tier alternatives to silver.
  • Carbon is also produced by deposition processes using a graphite source — its mechanism is the subject of Chapter 4.8.

Dispersed particles — suspended in carriers:

  • Carbon black: an abundant, commodity-priced broadband absorber.
  • Silicon carbide (SiC) and aluminum oxide (Al₂O₃): common, affordable ceramic particles.
  • Indium tin oxide (ITO) and antimony tin oxide (ATO): conductive ceramic absorbers, documented in patent literature as absorbing most strongly above 1,500 nanometers — the lower-energy stretch of the infrared band.
  • Lanthanum hexaboride (LaB₆) and cesium tungsten oxide (CWO): documented as absorbing in the energy-dense range beginning near 950 nanometers — though patent literature also records their nanoscale stability challenges: LaB₆ is moisture-sensitive, and CWO degrades through oxidation.
  • Titanium nitride appears here too, as dispersed nanoparticles — the same compound, a different construction.
Infographic — The Materials Map: Two families build every functional layer: sputtered continuous materials and dispersed particles in carriers.
The Materials Map Two families build every functional layer: sputtered continuous materials and dispersed particles in carriers.

One compound, two constructions; many compounds, one label. The map is the prerequisite for everything that follows.

Infographic — Different Compounds, Different Zones of the Band: ATO and ITO absorb in the low-energy tail. LaB₆, CWO, and TiN work at the energy-dense peak.
Different Compounds, Different Zones of the Band ATO and ITO absorb in the low-energy tail. LaB₆, CWO, and TiN work at the energy-dense peak.

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