ABSTRACT
We introduce a nanomechanical platform for fast and sensitive measurements of the spectrally resolved optical dielectric function of 2D materials. At the heart of our approach is a suspended 2D material integrated into a high Q silicon nitride nanomechanical resonator illuminated by a wavelength-tunable laser source. From the heating-related frequency shift of the resonator as well as its optical reflection measured as a function of photon energy, we obtain the real and imaginary parts of the dielectric function. Our measurements are unaffected by substrate-related screening and do not require any assumptions on the underling optical constants. This fast (τrise â¼ 135 ns), sensitive (noise-equivalent power = 90â£pWâHz), and broadband (1.2-3.1 eV, extendable to UV-THz) method provides an attractive alternative to spectroscopic or ellipsometric characterization techniques.
ABSTRACT
Alveolar hemorrhage (AH) is a rare syndrome that can often occur in autoimmune diseases, blood clotting disorders, infection or by acute inhalation injury, presenting rapid evolution and high mortality, especially with late diagnosis and treatment. Among the autoimmune diseases, there are reported cases in patients with primary antiphospholipid syndrome (PAPS), vasculitis and systemic lupus erythematosus (SLE). An early diagnosis is an essential tool in the successful management of this complication, requiring aggressive treatment based on vigorous immunosuppression and broad-spectrum antibiotic. We describe here a case of alveolar hemorrhage associated with glomerulonephritis as the open presentation in a patient with SLE.
