Control of the local photonic density of states above magneto-optical metamaterials

TL;DR

This paper demonstrates how the local photonic density of states near magneto-optical metamaterials can be actively controlled over a broad spectral range by adjusting an external magnetic field, enabling advanced manipulation of light-matter interactions.

Contribution

It introduces a method to actively tune the local density of states near magneto-optical metamaterials using magnetic field orientation and magnitude changes.

Findings

LDOS can be significantly altered by magnetic field adjustments.

Control over LDOS is achievable in both narrow and broad spectral ranges.

This enables active, deep-subwavelength manipulation of photonic states.

Abstract

The local density of states (LDOS) of electromagnetic field drives many basic processes associated to light-matter interaction such as the thermal emission of object, the spontaneous emission of quantum systems or the fluctuation-induced electromagnetic forces on molecules. Here, we study the LDOS in the close vicinity of magneto-optical metamaterials under the action of an external magnetic field and demonstrate that it can be efficiently changed in a narrow or a broad spectral range simply by changing the spatial orientation or the magnitude of this field. This result paves the way for an active control of the photonic density of states at deep-subwavelength scale.