Details

Autor(en) / Beteiligte

• Molesky, Sean
• Jin, Weiliang
• Venkataram, Prashanth S
• Rodriguez, Alejandro W

Titel

T Operator Bounds on Angle-Integrated Absorption and Thermal Radiation for Arbitrary Objects

Ist Teil von

• Physical review letters, 2019-12, Vol.123 (25), p.257401-257401, Article 257401

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2019

Quelle

PROLA

Beschreibungen/Notizen

• We derive fundamental per-channel bounds on angle-integrated absorption and thermal radiation for arbitrarily structured bodies-for any given material susceptibility and bounding region-that simultaneously encode both the per-volume limit on polarization set by passivity and geometric constraints on radiative efficiencies set by finite object sizes through the scattering T operator. We then analyze these bounds in two practical settings, comparing against prior limits as well as near optimal structures discovered through topology optimization. Principally, we show that the bounds properly capture the physically observed transition from the volume scaling of absorptivity seen in deeply subwavelength objects (nanoparticle radius or thin film thickness) to the area scaling of absorptivity seen in ray optics (blackbody limits).