Jongheon Lee

We present a coupled distributed feedback (DFB) laser system, based on AlGaAs/GaAs epitaxially grown compound semiconductor, with electroluminescence near 820 nm. This DFB laser system supports two lateral modes sharing a Bragg grating, thereby enabling simultaneous lasing operation at two different frequencies. We recorded a dual-mode operation with a 4.2 nm wavelength spacing, corresponding to a 1.86 THz beat frequency, and an output power of 14.7 mW at an injection current of 195 mA.

Microwave ablation is a therapeutic procedure to eliminate abnormal tissue within a body selectively. There are two types of ablation; thermal ablation aims to raise the temperature at the target, while nonthermal ablation induces a temporarily high electric field at the target to disrupt cellular membrane integrity. This work identifies the fundamental bounds of the efficiency for each type of ablation and the sources to achieve them.

Abstract : Acetaminophen and non-steroidal anti-inflammatory drugs (NSAIDs) have been widely prescribed to infected patients; however, the safety of them has not been investigated in patients with serious acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. Our objective was to evaluate the association between the previous use of acetaminophen or NSAIDs and the clinical outcomes of SARS-CoV-2 infection.