# Spectral selectivity from resonant-coupling in microgap-TPV

## TL;DR

This paper demonstrates how near-field and resonant coupling in microgap thermophotovoltaic systems can significantly enhance energy transfer, enabling efficient thermal conversion at lower emitter temperatures through computational modeling of optimized structures and materials.

## Contribution

It introduces a detailed computational model showing the potential of resonant near-field coupling in microgap-TPV systems for improved thermal energy transfer.

## Key findings

- Enhanced radiation transfer at ~100nm gaps due to resonance.
- Materials and structures can overcome natural limitations for lower-temperature thermal conversion.
- Computational results suggest feasibility of practical microgap-TPV devices.

## Abstract

Near-field energy coupling between two surfaces may arise from frustrated total-internal-reflectance and from atomic dipole-dipole interaction. Such an exchange of energy, if at resonance, greatly enhances the radiation transfer between an emitter and a photovoltaic converter. Computational modeling of selected, but realizable, emitter and detector structures and materials shows the benefits of both near-field and resonance coupling (e.g., with ~ 100nm gaps). In one sense, this is almost an engineering paper. A strong computational model (based on physically-proven concepts and incorporating known and predicted high-temperature properties of acceptable emitter materials) is used to demonstrate the potential of materials (properly-selected to overcome natural limitations) and of structures (carefully crafted to push the limits of present technology) for breaking barriers of thermal conversion at lower-emitter temperatures (< 1000C).

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Source: https://tomesphere.com/paper/0911.0860