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Principles and approaches of direct 3D writing using ultra-short laser pulses are now well established and have reached industrial requirements for throughput. Integration of 3D photonic functionalities and combining them with capabilities of 3D printing are overviewed.
As a class of semiconductors, transition metal dichalcogenides (TMDs) have the formula MX2, where M stands for a transition metal (i.e., Mo, W, Ti, Nb, etc.) and X stands for a chalcogen (i.e., S, Se or Te). TMDs show graphene-like layered structure. Strong covalent bonds in layers and weak van der Waals interaction between layers allow TMDs to form a robust 2D nanostructure. In a TMD monolayer, the...
We review our recent work on nanophotonic waveguide devices. We shall discuss structures which efficiently couple light into a plasmonic slot waveguide, and the use of a hyperuniform disordered photonic bandgap structure to make a highly compact waveguide polarizers. Nanoscale photonic integration was successfully used to demonstrate the monolithic integration of 850 photonic components on a CMOS...
The TriPleX technology of LioniX is a versatile dielectric waveguide platform based on alternating silicon nitride (Si3N4) and silicon oxide (SiO2) layers, fabricated with CMOS compatible equipment. The Low Pressure Chemical Vapour (LPCVD) deposition of Si3N4 and SiO2 allows batch manufacturing with stable material properties allowing full design by geometry and volume production.
Optical arbitrary waveform generation (OAWG) plays a critical role in many applications, such as generating optical ultra-wide band (UWB) signal, optical pulse radar, all-optical temporal differentiator, and test of optical communication system. Although lots of OAWG schemes were reported using mature fiber grating techniques, one of the most promising solutions is prone to be the miniaturization...
All-optical implementations of signal processing have attracted a great deal of attention due to the unique potential of this approach to overcome the bandwidth and speed bottleneck of electronic devices. Many all-optical signal processing techniques, offering processing bandwidths up to several THz, have been proposed and successfully employed in a wide range of areas, such as ultrafast telecommunications,...
Metamaterialsare electromagnetic composites constructed by subwavelength sized microstructures, and thus can exhibit tailored effective permittivity and permeability. Effective-medium theory (EMT) plays a crucial role since it serves as a bridge to link theories, which are frequently conducted on model hypothetical systems, and experiments which are always performed on realistic metamaterial systems...
Electromagnetic wave induced forces have been extensively studied for decades. It has been well known that for an electromagnetic wave propagating in vacuum the photons carrying momentum exert a positive photon pressure on an object. However, a metamaterial can have a negative effective refractive index, in which case the wave vector is directed towards the source of radiation. In such a medium, should...
We present a three-dimensional anisotropic elastic metamaterial, which can generate dipolar resonances. Repeating these subwavelength units can lead to one-dimensional arrays, which are essentially elastic rods that can withstand both longitudinal, and flexural vibrations. Band structure analysis shows the systems can have distinctive responses to waves with each polarization. In particular, we demonstrate...
In quantum information processing, one of the most common methods to represent a qubit is by means of the polarization degree of freedom of a photon. Efficient methods to determine the photon polarization state are hence the fundamental tools in the studies of qubit systems. In fact, both theoretically optimal and practical polarization measurement schemes have been investigated extensively in the...
In this talk, we will discuss our recent progress on second-order correlation weak-value measurements. By extending the conventional weak-value measurements to second-order correlation function, in one experiment, we have post-selected a nonlinear observable to improve the sensitivity of EIT-based magnetometry in an atomic vapor cell by few orders of magnitude in comparison to previous reports. In...
The state vector of a pure quantum system is a set of complex probability amplitudes used for describing the system in each state of a given Hilbert space. Characterizing the state of a quantum system is crucial for fundamental studies in quantum mechanics as well as for manipulating and utilizing quantum systems for practical applications.
Light transport in opaque scattering media mixes the light across the large number of modes in the system. The mixing results in the scrambling of information encoded on the incident light, which is generally detrimental. However, the multimodal transport hints at the possibility of utilizing them as complex optical networks if the transport could be controlled. In recent years, wavefront shaping...
Silicon Optical Fibers (SOFs) has attracted considerable interest for a wide range of applications, spanning from mid infrared power delivery, Raman amplification, and broadband supercontinuum generation to functionalized optoelectronic devices, microresonators and nonlinear optics. Subwavelength-core SOFs have been fabricated recently, however, their fascinating properties, which are significantly...
Exceptional point is a fundamental notion in quantum field theories and enables new functionalities in photonics. In this talk, I will discuss harnessing parity-time (PT) symmetry to realize optical exceptional points using the state-of-the-art integrated nanophotonics technology for novel optoelectronic functionalities. I will present unidirectional light transport and coherent light control at PT...
It has been demonstrated that photonic band gap can be realized in quasi-periodic photonic crystal. We design a two dimensional octagonal photonic quasicrystal composed of alumina cylinders. The photonic band gaps are theoretically examined by the Transfer Matrix Method (TMM) and Finite-Difference Time-Domain (FDTD) for transverse magnetic (TM) wave. A Y-shaped light splitter is designed and simulated...
The rhythmic features found in the spontaneous ultra-weak photon emission from seedlings, in the early stages of development, will be presented and discussed based in the results of past 10 years with wheat, corn and sunflower seeds. Synchronism with external triggers such gravimetric tide and geomagnetic cycles are studied and might give indications for further applications in chronobiology and agriculture.
As the most promising solution to sustain network capacity scaling beyond the fundamental nonlinear Shannon limits of standard single-mode fibers, space division multiplexing (SDM) has attracted enormous attention. To utilize the dimension of “space”, including mode-division multiplexing (MDM) using multi-mode (few-mode) fibers and core multiplexing using multi-core fibers, SDM can substantially increase...
Every living being have a UWPE (Ultra Weak Photon Emission), also known as Biophotons. Analysing these low energy emissions and its properties allows further understanding of the natural world around us, serving also as a diagnostic indicator for certain physiological characteristics, but its detection is hard and requires a set of very specific, sensitive and expensive equipment inside a dark chamber.
The emission of ultra weak light by living beings has been studied by several researchers throughout the world. The study of these emissions in biological samples is very important, due to its applications in the environmental, agronomical and biomedical areas. The objective here is to develop and implement a dark chamber with multiple tubes and a system able to make acquisition of spontaneous and...
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