A Sub-wavelength Si LED Integrated in a CMOS Platform

Overview

Journal Nat Commun

Specialty Biology

Date 2023 Feb 16

PMID 36797286

Authors

Zheng Li

Jin Xue

Marc de Cea

Jaehwan Kim

Hao Nong

Daniel Chong

Khee Yong Lim

Elgin Quek

Rajeev J Ram

Affiliations

Soon will be listed here.

Abstract

A nanoscale on-chip light source with high intensity is desired for various applications in integrated photonics systems. However, it is challenging to realize such an emitter using materials and fabrication processes compatible with the standard integrated circuit technology. In this letter, we report an electrically driven Si light-emitting diode with sub-wavelength emission area fabricated in an open-foundry microelectronics complementary metal-oxide-semiconductor platform. The light-emitting diode emission spectrum is centered around 1100 nm and the emission area is smaller than 0.14 μm (~[Formula: see text] nm). This light-emitting diode has high spatial intensity of >50 mW/cm which is comparable with state-of-the-art Si-based emitters with much larger emission areas. Due to sub-wavelength confinement, the emission exhibits a high degree of spatial coherence, which is demonstrated by incorporating the light-emitting diode into a compact lensless in-line holographic microscope. This centimeter-scale, all-silicon microscope utilizes a single emitter to simultaneously illuminate ~9.5 million pixels of a complementary metal-oxide-semiconductor imager.

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