Year: 2019
Type: article
Abstract: Chemical defects that fluoresce in the shortwave infrared open exciting opportunities in deep-penetration bioimaging, chemically specific sensing, and quantum technologies. However, the atomic size of defects and the high noise of infrared detectors have posed significant challenges to the studies of these unique emitters. Here we demonstrate high throughput single-defect spectroscopy in the shortwave infrared capable of quantitatively and spectrally resolving chemical defects at the single defect level. By cooling an InGaAs detector array down to -190 °C and implementing a nondestructive readout scheme, we are able to capture low light fluorescent events in the shortwave infrared with a signal-to-noise ratio improved by more than three orders-of-magnitude. As a demonstration, we show it is possible to resolve individual chemical defects in carbon nanotube semiconductors, simultaneously collecting a full spectrum for each defect within the entire field of view at the single defect limit.
Source: Nature Communications
Authors: Xiaojian Wu, Mijin Kim, Haoran Qu, YuHuang Wang
Institution: University of Maryland, College Park
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $5,200
Awards: G1121704093, Chemical Control of Quantum Defects in Low-Dimensional Carbon Materials, G406635756, THE CENTER FOR ENHANCED NANOFLUIDIC TRANSPORT (CENT), G479123316, G4795465671, Nanochemistry of sp3 Quantum Defects, G5103992296, THE CENTER FOR ENHANCED NANOFLUIDIC TRANSPORT (CENT), G8427054502, Chemical Gating of a Tube-in-a-Tube Semiconductor, G8539185995, G8843831616, G9000188624
OpenAlex ID: W2949192847