부산대학교 도서관

We demonstrate room temperature mid-wave infrared detectors with high peak detectivity. Our detector structures consist of type-II superlattice nBn detectors with ultra-thin ( $\sim $ 250 nm) absorbers, integrated into an all-epitaxial guided-mode resonance architecture. The resulting devices show strong spectral selectivity, controlled by grating period, and low dark currents. We achieve room temperature $\vphantom {_{\int }}$ TE-polarized peak specific detectivity ( $D^{*}$ ) of $\approx {1.2\times 10^{10}} \, {\text {cm}\sqrt {\text {Hz}}/\text {W}}$ at $\lambda = {4.4} \,{\mu }\text {m}$ and $\approx {1\times 10^{10}} \, {\text {cm}\sqrt {\text {Hz}}/W}$ at $\lambda = {4.7} \,{\mu }\text{m}$ , for grating periods of $\Lambda = {1.6} \, {\mu }\text{m}$ and $\Lambda ={1.8}\, {\mu }\text{m}$ , respectively. The presented all-epitaxial devices offer a unique approach to efficient room temperature mid-wave infrared detection with strong spectral and polarization selectivity.