TY - JOUR
T1 - T Operator Bounds on Angle-Integrated Absorption and Thermal Radiation for Arbitrary Objects
AU - Molesky, Sean
AU - Jin, Weiliang
AU - Venkataram, Prashanth S.
AU - Rodriguez, Alejandro W.
N1 - Publisher Copyright:
© 2019 American Physical Society.
PY - 2019/12/20
Y1 - 2019/12/20
N2 - 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).
AB - 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).
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U2 - 10.1103/PhysRevLett.123.257401
DO - 10.1103/PhysRevLett.123.257401
M3 - Article
C2 - 31922767
AN - SCOPUS:85077239288
SN - 0031-9007
VL - 123
JO - Physical review letters
JF - Physical review letters
IS - 25
M1 - 257401
ER -