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Within the last years it has been shown that chemical sensitive linear and non-linear spectroscopy approaches for multi-contrast and multi-parameter imaging of biological and biomedical target structures (e.g. viruses, pathogens, tumor cells, tissue sections, organs etc.) offers great potential for clinical diagnostics and therapy. Here, we review our recent work on transferring spectroscopic approaches...
Ghost imaging (GI) exploits the intensity correlations of light to reconstruct an object. A “ghost image” is obtained by correlating the total transmitted or reflected intensity of an illuminated object with the intensity of a highly-correlated reference beam which itself doesn't interact with the object. Intriguingly, the spatial resolution of the image is provided by the non-interacting reference...
Active spectral imaging in the mid-infrared can reveal absorption ‘fingerprints’ of different chemicals within a scene. The practicality of spectral imaging with active illumination is limited by the large number of images required (as the illumination wavelength or an interferometer mirror is scanned). Single pixel imaging uses the intensity reading from a single pixel detector while illuminating...
With upconversion based mid-infrared reflection spectroscopy we have proved it possible to differentiate between several common types of black plastics. This allow for the possibility of efficient sorting of black plastics in clean fractions, paving the road for both economically viable and ecologically sustainable recycling.
Through generation of coherent extreme ultraviolet (XUV) radiation, high-harmonic generation (HHG) has opened up a wealth of possibilities for table-top research, ranging from attosecond dynamics to high resolution coherent imaging. The ability to perform interferometry with HHG sources would enable powerful coherent optical techniques such as Fourier transform spectroscopy in the XUV spectral range...
The continuous development of terahertz (THz) sources has opened up many potential applications in spectroscopy, imaging and communications. One popular THz source is the quantum cascade laser (QCL), which has many desirable properties including compactness and high output power with a narrow emission frequency. For such a source to be successfully integrated into a THz communication system, it is...
Measurements of quantum states of photons are conventionally performed with series of optical elements in bulk setups [1] or optical chips incorporating multiple tunable beam splitters. Here, we suggest and develop experimentally, for the first time to our knowledge, a new concept of quantum-polarization measurements with a single all-dielectric resonant metasurface [2]. The operating principle is...
Hyperbolic metamaterials offer a unique solution to overcome the diffraction limit due to the ability of propagating high spatial frequencies [1]. To date, there have been several demonstrations of hyperbolic metamaterials that can convert evanescent fields into propagating waves based on their geometrical structure and therefore can be used as lenses [2-4]. The drawback of all the proposed hyperlenses...
In this work, we present a fluorescent on-chip imaging system utilizing a custom-made dye-doped-resin type filter. The filter used in the system was characterized to determine its transmission properties. Unique steep cut-off property of the filter allows to align emission wavelength of the fluorophores to provide better signal-to-noise ratio (SNR). We precisely showed that fluorescent micro-objects...
The study of light beams carrying integer orbital angular momentum (OAM) has become ubiquitous during the last two decades because of their unique capability to harness light matter-interaction with applications in different fields such as optical communications, super-resolution imaging, and quantum optics [1]. Alternatively, light beams carrying non-integer OAM have also recently been demonstrated...
One of the ultimate goals of molecular physics is the possibility of accessing the structural dynamics of molecules through external fields. To this end, one first has to image the molecular structure and dynamics with few-fs temporal resolution and atomic spatial resolution simultaneously. Laser induced electron diffraction (LIED) is a very promising candidate for the spatiotemporal imaging of small...
Nonlinear wavelength up-conversion from the infrared (IR) to the visible spectrum appears as an interesting alternative for imaging applications. Since early demonstrations [1], work is being done to improve significantly features of up-converted images in terms of the efficiency by intra-cavity continuous wave up-conversion [2] and resolution and field-of-view by incoherent illumination [3]. Direct...
The resolution obtained with coherent diffractive imaging (CDI) is limited by a number of factors, one of which is the transverse coherence of the illuminating beam. For a successful reconstruction, it is accepted that the illuminating beam should have a lateral coherence length of at least twice the largest linear dimension of the sample [1].
The topology of a gapped band structure is characterised by a bulk invariant and is deeply related to the existence of gapless edge modes through a principle known as bulk-edge correspondence. This correspondence has allowed to evidence topological phases by probing edge properties. Nonetheless, some experiments based on optical lattices of cold atomic gases have reported the possibility to directly...
Exploitation of the statistical properties of classical or non-classical light sources is the cause of fascinating new applications. For the two last decades, ghost imaging has emerged as a way to form images of an object with a Single Point Detector (SPD) that does not have spatial resolution [1-5]. By taking into account space-time duality in optics, the extension of the results of spatial ghost...
With the rapid development of spatially-resolving single-photon detectors, spatially structured multidimensional entangled states start to play a key role in modern quantum science. In particular, they find extensive applications in emerging fields such as quantum imaging, holography, computation or quantum-enhanced metrology. Moreover, spatially-multiplexed schemes hold a promise to increase the...
Fiber-optical microscopy probe have been applied in in-vivo fluorescent imaging with sub-micrometer resolution for scientific and diagnostic applications [1]. However, conventional fiber-optical magnetic microscopy probe is not well suited for imaging living biological subjects. One of the reasons is that the miniaturization of fiber-optical magnetic microscopy probe is limited by the size of micro-lens...
Metal laser additive manufacturing (LAM) provides unique possibilities for the fabrication of complex parts in many key industrial areas such as aerospace, automotive, and healthcare. However, due to variations in part geometry, local environment, and the inherent stochasticity of the laser melting process, reproducibility in final part morphology and characteristics is a major concern. In this paper,...
Ghost imaging is a novel imaging technique based on correlation measurements between a structured illumination pattern (the reference) and the total intensity transmitted or reflected by an object [1]. The reference illumination patterns may be either randomly generated by a spatially incoherent light source, or pre-programmed e.g. with a spatial light modulator. Light transmitted (or reflected) by...
Alpha emitting radiation sources are typically hard to detect due to the short range of alpha particles in air (4cm). A remote detection of alpha radiation in air is possible by imaging the ionization-induced fluorescence (radioluminescence) of air molecules [1]. The alpha-induced ultraviolet light is mainly emitted by molecular nitrogen as fluorescent light with wavelengths in the regime of 297–405...
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