Reflective Optical Limiter Based on Resonant Transmission

TL;DR

This paper introduces a novel reflective optical energy limiter that blocks high-energy pulses by reflecting them, using a temperature-dependent defect layer in a photonic structure, preventing damage from overheating.

Contribution

The paper presents a new concept of a reflective energy limiter that avoids absorption and damage by reflecting high-energy pulses, based on a self-regulated impedance mismatch mechanism.

Findings

The device effectively reflects high-energy pulses exceeding a certain threshold.

It operates over a broad frequency window due to the defect mode.

The approach prevents overheating and destruction of the limiter.

Abstract

Optical limiters transmit low-level radiation while blocking electromagnetic pulses with excessively high energy (energy limiters) or with excessively high peak intensity (power limiters). A typical optical limiter absorbs most of the high-level radiation which can cause its destruction via overheating. Here we introduce the novel concept of a reflective energy limiter which blocks electromagnetic pulses with excessively high total energy by reflecting them back to space, rather than absorbing them. The idea is to use a defect layer with temperature dependent loss tangent embedded in a low-loss photonic structure. The low energy pulses with central frequency close to that of the localized defect mode will pass through. But if the cumulative energy carried by the pulse exceeds certain level, the entire photonic structure reflects the incident light (and does not absorb it!) for a broad frequency window. The underlying physical mechanism is based on self-regulated impedance mismatch which increases dramatically with the cumulative energy carried by the pulse.