This paper is addressed to possibility of images recognition by using hybrid architecture of optical and quantum-digital parts. Optical part forms a specific light signal, corresponding to different image patterns, and quantum-digital part records and process this information, which is read by quantum states measurement at the end of gas flow. Supersonic overcooled gas flow is proposed to use as a quantum information storage medium, because molecular spectra are well resolved in this case, and, therefore, better control over them by laser field can be implemented. Decoherence level in ensemble of molecules and clusters, representing gas flow, can be controlled by its rarefaction degree and its extension. Population of quantum states can be manipulated either by laser beam reflected from explored object surface(holography) in the case of low intensity or from interior object structures(tomography) in the case of high intensity. For better control over quantum levels population, laser beam is represented as a sequence of specifically shaped laser pulses. Variation of laser intensity, projected into gas flow, is produced by interference of laser beam, reflected from the explored pattern surface, and reference beam. Once irradiated, gas flow feeds spectrometer inlet. In spectrometer, electrons from excited molecules are ejected by applied ionizing laser pulse(finalizing measurement). Obtained electron energy spectra, containing information of original optical image, are recorded by the network of surrounding electrodes, so that information on spatial configuration of the object is translated into time evolution of current induced on electrodes, which is transformed to digital format by analog-digital converter for further processing by comparison of obtained electrical signals with the library of previously recorded signals, corresponding to possible images.

Ioachim Pupeza has completed his PhD in laser physics in 2011 at the Max Planck Institute of Quantum Optics (MPQ) and the Ludwig Maximilians University of Munich, Germany, after receiving diploma degrees in electrical engineering and pure mathematics from the Technical University Braunschweig, Germany in 2006 and 2007, respectively. In 2013/2014 he worked as a postdoctoral researcher at the Institute of Photonic Sciences in Barcelona, Spain, and since 2014 he has been leading the research group Field-Resolved Metrology at the MPQ. He has published more than 35 papers in reputed peer-reviewed journals.

Doped oxide semiconductors have received much attention for emerging surface plasmons in the infrared (IR) region. Recently, oxide semiconductors such as In₂O₃, ZnO have been launched as new plasmonic nanomaterials. Recently, our group reported surface-enhanced optical spectroscopes with a view to developing new sensing platforms. In this work, we focus on plasmonic response of doped oxide semiconductors with a view to providing valuable strategies for the development of new optical functionalization related to energy-saving technology for window applications. In this presentation, we report surface plasmonic properties of doped transparent oxide semiconductors in addition to those of noble metals such as Au and Ag, and then their thermal shielding applications in the IR region. In particular, three-dimensionally assembled ITO NP nanosheets showed high selective light reflection in the NIR region as a consequence of plasmon coupling between the NPs. A spatial gap between NPs is induced strong electric fields, which is related to a near-field effect on NP surfaces. This near-field phenomenon effectively produces plasmon resonances in the NP nanosheets, which acted as thermal shielding in the IR solar light. This study introduces surface plasmons on oxide semiconductor NPs as one of size-dependent properties for energy-saving applications. 

In this talk, high-speed optical wireless communications (OWC) technologies will be reviewed and introduced. The first scheme is bi-directional short-range free-space optical communication with 2x4x10 Gb/s capacity in wavelength division multiplexing (WDM) channels short transmission distance. The single-mode-fiber is used in the optical terminals for both optical transmitting and receiving functions. The measured power penalties for bi-directional, WDM OWC are less than 0.8 dB and 0.2 dB, compared with the back-to-back link and uni-directional transmission system, respectively. The second scheme is hybrid optical fiber and OWC link in outdoor environments such as cross bridge or inter-building system. A sensor head is used for monitoring the condition of bridge, and in the case of the bridge being damaged the transmission path could be changed from fiber link to OWC link to ensure data link connectivity. In both cases, the single-mode fiber are used in the optical terminals for both optical transmitting and receiving functions. The influences of environmental factor including window glasses, air turbulence and rainfall will also be addressed. The colorless and colored window glasses introduce losses under various incident angles, but did not induce substantial power penalties. The air turbulence induces extra transmission loss and instability in the received power. Raindrops are the most influential environmental factor. The bit error rate (BER) test shows that raindrops result in a seriously impaired BER to interrupt the transmission instantaneously. After appropriate performance improvement, these proposed transmission structures show potential applications for outdoor transmission under various natural weather conditions.

It has been widely known that we can see the surface blood vessel network of the thin part of our body. The near-infrared (NIR)  light in the biological window range (700-1200 nm wavelength)  is commonly used in biomedical applications such as a vein viewer and the vein authentication. The NIR light can penetrate much deeper in our body than the light of visible wavelength. However, the deep structure could not be visualized because of the strong scattering in body tissue. We developed some techniques to suppress the scattering effect and verified their feasibility in experiments. They are: the extraction of the near- axis scattered light (NASL) and the weakly scattered light (WSL) from the strongly scattered light. The deconvolution with a depth- dependent point spread function is another technique to suppress the scattering effect in a transillumination image. With these techniques we can visualize the macroscopic structure of an animal body in two dimensional (2D) images. Using the 2D transillumination images taken from different orientations, we can reconstruct the cross-sectional images and eventually the macroscopic three-dimensional (3D) image of the internal structure of an animal body. The effectiveness of the proposed technique was examined in the experiments with 3D model phantoms, and its applicability to an animal body was verified in the imaging of experimental animals.