US 11,079,652 B2 · Omniresonant broadband coherent perfect absorption (CPA) apparatus, method, and applications

Abstract

The present disclosure is directed to systems and methods for omniresonant broadband coherent perfect absorption of incoherent light over large bandwidths. The apparatus and methods that enable 100% effective optical absorption in a structure, irrespective of the material from which it is constructed, over a large, continuous bandwidth (omniresonance) in ultrathin devices. Specifically, we demonstrate achromatic optical absorption (omniresonance) in a planar Fabry-Pérot micro-cavity via angularly multiplexed phase-matching. By assigning each wavelength to an appropriate angle of incidence, the micro-cavity is rendered absorbing with continuous spectral range. For example, the linewidth of a single-order 0.7 nm wide resonance is de-slanted in spectral-angular space to become a 70 nm wide achromatic resonance spanning multiple cavity free spectral ranges. The embodied invention can have important applications in, e.g., harvesting solar energy, white-light micro-lasers, and other broadband resonantly enhanced optical effects.

Claims8

Dependent claims

An omniresonant broadband coherent perfect absorption (CPA) apparatus, comprising:

a light diffracting component;
a lens L1;
and
an omniresonant optical cavity, disposed along an optical axis,
wherein the omniresonant optical cavity is disposed tilted at an angle, ψ, with respect to the optical axis,
further wherein an angle γ(λ) is a diffraction angle of a white-light input to the diffraction component with respect to a light diffracting component normal,
wherein γ(λ)−γo is the angle that any wavelength λ makes with respect to the optical axis,
wherein γ(λ) is within a range from 12 degrees to 70 degrees and γ0 is within a range from 45 degrees to 65 degrees,
wherein a central wavelength λc is diffracted at γo=γ(λc=550 nm) and coincides with the optical axis,
wherein the incidence angle made by the wavelength λ after the lens with respect to the optical axis is
φ
⁡
(
λ
)
=
tan
-
1
⁢
{
d
1
d
2
⁢
tan
⁡
(
γ
⁡
(
λ
)
-
γ
o
)
}
,
where d1 and d2 are the distances from the light diffracting component to the lens L1 and from the lens L1 to the cavity, respectively, such that the condition θ(λ)=φ(λ)+ψ is satisfied.

38 more elements

Dependencies are inferred from the claim text.

Omniresonant broadband coherent perfect absorption (CPA) apparatus, method, and applications

Life of this patent

Omniresonant broadband coherent perfect absorption (CPA) apparatus, method, and applications

Life of this patent

Abstract

Claims8