The structural transformations (STs) in metal-organic frameworks (MOFs) have routed a promising possibilities to use them for data processing and information encoding. However, in order to be applicable in real life devices, such systems encounter a problem of low speed rates (κ) and poor repeatability. In our research, we report on a flexible 2D MOF single crystals possessing light driven structural anisotropy with fast (5000 s-1) and highly repeatable (over 104 cycles of ST at ambient conditions) optical modulation. The confirmed stability of such MOF-based optical modulator during 1 year shed light on the design of new family of functional optical materials for information technology.
The integration of metal-organic frameworks (MOFs) as coordination polymers into the field of nonlinear optics and light conversion has recently attracted significant attention. However, the challenge of achieving high endurance and efficiency for light conversion throughout the entire visible range using a single MOF crystal persists. In this work, we present the design of a non-centrosymmetric MOF based on a 1,3,5-benzenetricarboxylic acid ligand and Erbium (Er) ions, which demonstrates efficient and simultaneous generation of multiple second and third optical harmonics (SHG, THG) across a wavelength range of 400 to 750 nm. Through a combination of optical experiments we have confirmed the effectiveness of SHG and THG in the MOF single crystals. These phenomena are caused by the specific MOF space group and the associated dipole moment. The observation of coherent light conversion throughout the entire visible range by MOF single crystals under ambient conditions enables the realization of multicolor (up to 3) emission, which is essential for modern laser technologies.
Natural carbon isotopes (carbon-12 (12C) and carbon-13 (13C)) contained in human respiration can be used to detect various diseases (cachexia, helicobacter pylori). Isotope mass spectrometry (IRMS), which is widely used to determine carbon isotopes in human respiration has a high level of accuracy and sensitivity, but is a very complex and expensive technique. There is a less expensive way to detect carbon isotopes using an isotope-selective non-dispersive infrared spectrometer (NDIRS), but it is only suitable for simple breath tests when a small number of samples is required. Raman spectroscopy is well suited for the simultaneous detection of various gases in the analysis of human respiration, but the Raman signal from the carbon isotopes has a very low intensity, what makes their detection difficult. In this work, we demonstrate an effective system for detecting carbon isotopes 12CO2 and 13CO2 in human breath with an extremely low concentration level of ~ 0.01%. The Raman detector consists of a 5 W CW narrow-linewidth single-frequency solid-state laser at 532 nm, a focusing system with compensation for a spherical aberration, a gas cell which can withstand pressures up to 100 atmospheres and a high-resolution Czerny-Turner based spectrometer with a matrix, cooled by a Peltier element down to -40 °C. Such a system has a lower cost in comparison with analogues and can be used the medical diagnosis of various diseases.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.