A5069530679- Terahertz technology and applications
- Spectroscopy and Laser Applications
- Photonic and Optical Devices
- Crystallization and Solubility Studies
- Acoustic Wave Resonator Technologies
- X-ray Diffraction in Crystallography
- Advanced Chemical Sensor Technologies
- Nonlinear Optical Materials Research
- Thermography and Photoacoustic Techniques
- Solid-state spectroscopy and crystallography
- Photonic Crystals and Applications
- Molecular Spectroscopy and Structure
- Aerogels and thermal insulation
- Superconducting and THz Device Technology
- Theoretical and Computational Physics
- Copper Interconnects and Reliability
- Nuclear Physics and Applications
- Advanced Chemical Physics Studies
- Spectroscopy and Quantum Chemical Studies
- GaN-based semiconductor devices and materials
- Crystallography and molecular interactions
- Nonlinear Dynamics and Pattern Formation
- Chemical Synthesis and Characterization
- Perovskite Materials and Applications
- Plant and animal studies
ZHAW Zurich University of Applied Sciences
2018-2025
Computational Physics (United States)
2025
Jožef Stefan International Postgraduate School
2013-2023
University of Ljubljana
2013-2015
Jožef Stefan Institute
2014
Organic crystals with second-order optical nonlinearity feature very high and ultra-fast nonlinearities are therefore attractive for various photonics applications. During the last decade, they have been found particularly terahertz (THz) photonics. This is mainly due to intense ultra-broadband THz-wave generation possible these crystals. We review recent progress challenges in development of organic crystalline materials detection discuss their structure, intrinsic properties, advantages...
Abstract Organic π‐conjugated crystals with second‐order optical nonlinearity are considerably attractive materials for diverse terahertz (THz) wave photonics. An overview of the research organic nonlinear (NLO) THz generation, detection, and applications is provided here. First, status NLO compared to other alternative described. Second, basic theory requirements generators detectors explained. Third, a primary focus on that have been developed during last decade, various molecular...
Terahertz time-domain spectroscopy and imaging is used to study the effects of various hiding techniques spectral features drug explosive simulants in combination with different paper textile barriers. Results show that rapid detection identification concealed possible frequency range from 1.5 4.0 THz by using an organic-crystal-based terahertz system peak analysis method.
AbstractAbstract: In last two decades, rapid development in the field of terahertz (THz) technology has opened new possibilities for creating innovative imaging and sensing systems. Although applications THz different sectors constantly increase, construction industry lags behind them. The aim this article is to review current spectroscopy research related building materials, along with key drawbacks recommendations future use. concludes that have promising potential provide many...
Developing new organic crystals for efficient broad terahertz (THz) wave generation remains challenging, as multiple critical material properties must be achieved simultaneously within a single crystal. In this work, we introduce series of nonlinear optical salt tailored THz generators. The newly designed fluorinated cationic chromophore, 6-fluoro-2-(4-hydroxystyryl)-1-methylquinolinium (OH6FQ), has been incorporated with various or non-fluorinated anions into six different ionic crystals....
The terahertz range of the electromagnetic spectrum reveals important insights when studying material properties. An ultra‐broadband time‐domain spectroscopy system based on state‐of‐the‐art, high‐stability organic nonlinear optical crystals used as both THz wave generator and detector is presented. In transmission geometry, a broad exceeding 20 high dynamic more than 80 dB achieved using compact 100 MHz femtosecond laser working at telecom wavelength 1560 nm. normal‐incidence reflection...
Abstract In the development of new organic crystals for nonlinear optical and terahertz (THz) applications, it is very challenging to achieve essentially required non‐centrosymmetric molecular arrangement. Moreover, resulting crystal structure mostly unpredictable due highly dipolar components with complex functional substituents. this work, salt top‐level macroscopic nonlinearity by controlling van der Waals volume ( V vdW ), rather than trial error, are logically designed. When ionic...
Solid-state molecular phonons play a crucial role in the performance of diverse photonic and optoelectronic devices. In this work, new organic terahertz (THz) generators based on catechol group that acts as phonon suppressing intermolecular adhesive are developed. The is widely used mussel-inspired mechanical chemistry. Newly designed electro-optic crystals consist catechol-based nonlinear optical 4-(3,4-dihydroxystyryl)-1-methylpyridinium (DHP) cations 4-(trifluoromethyl)benzenesulfonate...
The increasing scarcity of natural resources, worsening global climate change, environmental degradation, and rising demand for food are forcing the biotechnology plastics industries to seek apply circular economy models that would lead a sustainable transition in production use bioplastics. Circular can improve economic productivity bio-based have positive impact on environment by reducing conventional plastic waste consumption petrochemical feedstocks production. In addition, some...
There is a need for fast and reliable quality authenticity control tools of pharmaceutical ingredients. Among others, hormone containing drugs foods are subject to scrutiny. In this study, terahertz (THz) spectroscopy THz imaging applied the first time analyze melatonin its product Circadin. Melatonin found naturally in human body, which responsible regulation sleep-wake cycles. frequency region between 1.5 4.5 THz, characteristic spectral features at 3.21 weaker one 4.20 observed allowing...
In the last decade, terahertz (THz) technologies have been introduced to detection, identification, and quantification of biomolecules in various biological samples. This review focuses on substances that represent important biomarkers urine associated with cancers their treatments. From a diagnostic point view, liquid biopsy is particularly because it allows non-invasive rapid collection large volumes this review, THz spectral responses considered metabolic obtained previous studies are...
Organic crystals with second-order optical nonlinearity feature very high and ultra-fast nonlinearities are therefore attractive for various photonics applications. During the last decade, they have been found particularly terahertz (THz) photonics. This is mainly due to intense ultra-broadband THz-wave generation possible these crystals. We review recent progress challenges in development of organic crystalline materials detection discuss their structure, intrinsic properties, advantages...
Abstract Organic terahertz (THz) crystals consist of polar molecules with various functional substituents, resulting in numerous molecular phonon vibrations the THz frequency range. However, effect incorporating substituents into organic on absorption is rather an unexplored area. In this work, by choosing appropriate model system consisting two benchmark nonlinear optical crystals, exhibiting identical type phenolic cation–anion assembly but different their ultra‐broadband wave generation...
We present results on the comparison of different THz technologies for detection and identification a variety explosives from our laboratory tests that were carried out in framework NATO SET-193 "THz technology stand-off explosives: spectroscopy to field" under same controlled conditions. Several laser-pumped pulsed broadband time-domain (TDS) systems as well one electronic frequency-modulated continuous wave (FMCW) device recorded spectra transmission and/or reflection.
Abstract Ultra‐broadband THz photonics covering the 0.3–20 range provides a very attractive foundation for wide of basic research and industrial applications. However, lack ultra‐broadband devices has yet to be overcome. In this work, high‐density organic electro‐optic crystals are newly developed efficient wave generation in broad spectral successfully used broadband time‐domain spectroscopy. The new generator crystals, namely OHP‐TFS have low void volume, high density, shown cover spectrum...
We report on measurements of the refractive indices and absorption in bulk single crystals aluminum nitride, region from 1 to 8 THz. The birefringence is approximately 0.2 larger than optical frequency range. Both exhibit normal dispersion with no pronounced resonances. Optical power loss coefficients are 2 cm−1 4 estimated static dielectric constants 7.84 9.22, for ordinary extraordinary polarization, respectively.
Several pharmaceutical drugs, such as alprazolam, ibuprofen, acetaminophen, activated carbon and others, caffeine-containing foods were tested using terahertz (THz) time domain spectroscopy in the range from 0.3 to 2 THz. The dry powder of drugs was mixed with HDPE pressed into pellets hydraulic press. coffee grounds also after ball-milling mixing HDPE. caffeine containing liquid dried out on paper strips various stacking. Experiments allow one determine characteristic spectral signatures...
Abstract Development of new organic crystals possessing large second‐order optical nonlinearity is very challenging because strong tendency centrosymmetric dipole–dipole molecular assembly in crystals. This makes it difficult to develop various analogous that allow fine tuning and physical properties enhance the device performance. A design approach an isomorphic crystal library consisting 11 highly efficient nonlinear salt reported. Analyzing so‐called tolerance space previously reported...