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High-Capacity Directly Modulated Optical Transmitter for 2-μm Spectral Region
The 2-µm wave band is emerging as an attractive region for optical communications because of several major advantages. First of all, the Hollow-Core Photonic Band Gap Fiber (HC-PBGF), which has ultra-low...
PublicationsReflectivity and Bandwidth Modulation of Fiber Bragg Gratings in a Suspended Core Fiber by Tunable Acoustic Waves
The acousto-optic modulation of fiber Bragg gratings in a four holes suspended core fiber is experimentally demonstrated. Strong modulations with a reflectivity amplitude decrease by up to 67% and a 57%...
PublicationsOptical phonon features of triclinic montebrasite: dispersion analysis and non-polar Raman modes
Polarized infrared and Raman spectra of triclinic LiAl(PO4)(OH) [montebrasite] single crystal were recorded for appropriate optical configurations. Dispersion analysis was applied on the infrared reflectivity...
PublicationsBroadband sample holder for microwave spectroscopy of superconducting qubits
We present a practical design and implementation of a broadband sample holder suitable for microwave experiments with superconducting integrated circuits at millikelvin temperatures. Proposed design can...
PublicationsExploitation of the hepatic stellate cell Raman signature for their detection in native tissue samples
Hepatic stellate cells (HSCs) surround liver sinusoids and store retinol while they are quiescent. During fibrotic liver diseases and acute-on-chronic liver failure they change to the activated state in...
PublicationsRaman spectroscopic investigation of 13CO2 labeling and leaf dark respiration of Fagus sylvatica L. (European beech)
An important issue, in times of climate change and more extreme weather events, is the investigation of forest ecosystem reactions to these events. Longer drought periods stress the vitality of trees and...
PublicationsRapid monitoring of intermediate states and mass balance of nitrogen during denitrification by means of cavity enhanced Raman multi-gas sensing
The comprehensive investigation of changes in N cycling has been challenging so far due to difficulties with measuring gases such as N2 and N2O simultaneously. In this study we introduce cavity enhanced...
PublicationsFast and Highly Sensitive Fiber-Enhanced Raman Spectroscopic Monitoring of Molecular H2 and CH4 for Point-of-Care Diagnosis of Malabsorption Disorders in Exhaled Human Breath
Breath gas analysis is a novel powerful technique for noninvasive, early-stage diagnosis of metabolic disorders or diseases. Molecular hydrogen and methane are biomarkers for colonic fermentation, because...
PublicationsSapphire fiber Bragg gratings for high temperature and dynamic temperature diagnostics
This paper reports on a new kind of temperature sensor operating over an extremely large temperature range at high monitoring speeds. The sensor utilizes fiber Bragg gratings inscribed into multimode single...
PublicationsAtomic layer deposition of AlN for thin membranes using trimethylaluminum and H2/N2 plasma
Aluminum nitride (AlN) thin films with thicknesses from 25 to 100 nm were deposited on silicon and amorphous silica by plasma enhanced atomic layer deposition (PE-ALD). Trimethylaluminum (TMA) and a H2...
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