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Light Conference 2018 International Academic Conference

Submissions to ‘Rising Star of Light’

'Rising Stars of Light' Awards
Submission Statement

To encourage young scholars to publish their innovative work, we'd like to set up an award, 'Rising Stars of Light'.  The academic achievements of all the award recipients must be original and unpublished in optics: one first-prize (a prize of ¥ 20000), two second-prizes (a prize of ¥ 10000) and three third-prizes (a prize of ¥ 5000) will be selected on site. Please see official website for more specific selection rules and procedures.

Submission deadline:May 15, 2018

  • Metasurface has been proposed as the next-generation 2D functional material to replace classic optical components. While metasurfaces have unique advantages to achieve light modulation with an ultra-thin 2D layer, the relatively low transfer efficiency is a primary drawback. Such weakness leads to the mixing of unmodulated light into the output signal and greatly limits the functionality. We present a new design strategy to fabricate self-filtering metasurface with pure modulated light, which is computationally and experimentally verified on different applications to improve their performance. It is also insensitive to the incident light polarization. Normal metasurface system requires bulky polarizer and filter, while our ultra-thin design paves the way to multi-functional meta-surface-based chip-scale circuits to replace the conventional optical components. A prove-of-principle meta-cavity is designed to improve the transfer efficiency by 83%, while theoretical calculation shows 633% enhancement for an upgraded setup. This design can be widely applied to optical lithography, integrated photonics, optical sensing, data-processing, and nano-imaging.
  • CW laser operation at 2.09 μm pumped by a 796 nm laser diode is achieved with an output power of 11 W and an optical-to-optical conversion efficiency of 28.9%, both of which are the highest values reported so far for lasing around 2.1 m in Tm3+ doped mixed sesquioxide ceramics.
  • The joint presence of narrow bandgap and a 2DEG arising from topological surface states enables the realization of excellent Ohmic contacts. We selected Bi2Se3 and TaSe2 to construct terahertz detectors with high sponsivity and short response time.
  • The emerging meta-holograms rely on arrays of intractable meta-atoms with various geometries and sizes for customized phase profiles, which can only modulate the phase of wavefront precisely at an optimal incident angle of given wavelengths. The stringent and bandlimited angle tolerance remains a fundamental obstacle towards their pragmatic applications, in addition to high fabrication precision demands. Utilizing a different design principle, we reveal that facile metagrating holograms based on extraordinary optical diffraction could empower molding arbitrary wavefronts with extreme angle tolerance (near grazing incidence) in the visible-near infrared regime. Modulating the displacements between uniformly-sized meta-atoms rather than geometrical parameters, the metagratings produce robust detour phase profile irrespective of wavelengths and incident angles. The demonstration of high-fidelity meta-holograms and in-site polarization multiplexing significantly simplifies the metasurface design and lowers the fabrication demand, and thereby opens new routes towards flat optics with high performances and improved practicality.
  • An exceptional microlaser with its gain-loss modulation tailored at a quantum-symmetry exceptional point, which enables unique photonics functionalities (such as structured and twisted lasing radiations) with enhanced energy-efficiency even in the nonlinear regime above the lasing threshold.
  • Based on the classic two-state model, liquid water is a complex system of ice-like and quartz-like structure. Although lots of theoretical work have been completed about this model, experimental evidences are still needed. Herein 355 nm pulse laser is employed to excite stimulated Raman scattering (SRS) of liquid water both in bulk and on surface with the generation of shock wave induced dynamic high pressure. Two characteristic features Raman peaks of both spontaneous Raman and SRS indicate the coexistence of two components in localized water area. The ice-like structure in liquid water corresponds to ice Ih phase under the presented conditions, because the pressure dependence of low Raman shift agree well with the anomaly of diffusion coefficient in ice Ih phase, when the shock wave induced dynamic high pressure forms. Two structures of water molecules show different pressure dependent behaviors based on the SRS results observed, meanwhile the distribution of two structures is different in bulk and on surface.
  • The magneto-optical polarization rotation effect has prolific applications in various research areas spanning the scientific spectrum including space and interstellar research, nano-technology and material science, biomedical imaging, and sub-atomic particle research. In nonlinear magneto-optical rotation (NMOR), the intensity of a linearly-polarized probe field affects the rotation of its own polarization plane while propagating in a magnetized medium. However, typical NMOR signals of conventional single-beam $\Lambda-$scheme atomic magnetometers are peculiarly small, requiring sophisticated magnetic shielding under complex operational conditions. Here, we show the presence of an energy-symmetry blockade that undermines the NMOR effect in conventional single-beam $\Lambda-$scheme atomic magnetometers. We further demonstrate, both experimentally and theoretically, an inelastic wave-mixing technique that breaks this NMOR blockade, resulting in more than five orders of magnitude ($>$300,000-fold) NMOR optical signal power spectral density enhancement never before seen with conventional single-beam $\Lambda-$scheme atomic magnetometers. This new technique, demonstrated with substantially reduced light intensities, may lead to many applications, especially in the field of bio-magnetism and high-resolution low-field magnetic imaging.
  • Interferometric methods are known for their high sensitivity for biochemical optical sensing, but on the expense of their large size. By using wedge interferometry, the size can be drastically reduced while maintaining adequate detection capabilities. In this article, a miniaturized refractometer based on this interferometer type is demonstrated to be able to achieve Sensitivity of 1.66×10^-5 RIE/µm and Detection Limit of 8.7×10^-5 RIE for bulk refractometry of glucose aqueous solution. The device consists of two semitransparent mirrors made of glass slide coated by sputtered Aluminum thin film, enclosing a tapered frame that maintains one mirror slightly tilted with respect to the other, and simultaneously encloses the liquid under test. This structure causes interference pattern that depends on the refractive index of the test liquid when illuminated by a collimated laser beam. Analytical modeling is developed for the structure, from which a very promising estimation of the sensitivity is evaluated that exceeds the state-of-the-art for volume refractometry, and can be achieved upon using microfabrication techniques. Numerical simulations are also presented for principle validation. The proposed novel device opens a new avenue for optofluidic detection and is very suitable for point-of-care-testing and handheld devices due to its compact size, simple and cheap fabrication.
  • The detection of the concentration of Benzo[a]pyrene in water play an important role in the field of chemistry, medicine, and biology because Benzo[a]pyrene is identified carcinogens that cause cancer of the lungs, skin, and prostate, and act as endocrine-disrupting compounds. Meanwhile, the immunoreactions between the antibody and the target in the antigen, which is widely used in label-free biosensors, are highly relied on the flow rate according to the intrinsic adsorption kinetics. However, most of optical biochemical sensor for the detection of B[a]P lack the simultaneous measurement of B[a]P concentration and flow rate. In this paper, a flow rate compensated fiber optic biosensor based on Co2+ doped tilted fiber Bragg gratings has been proposed and experimentally demonstrated for the detection of the Benzo[a]pyrene molecules. A tilted fiber Bragg grating with a tilted angle of 8º was inscribed into a Co2+ doped fiber. The flow rate and Benzo[a]pyrene molecules can be measured simultaneously by interrogating the resonance wavelength of core mode and wavelength interval between the core mode and cladding mode according to the heat exchange and evanescent field of the cladding mode, respectively. The experimental results show that the Benzo[a]pyrene sensitivities of up to 12 pm/pM, the limit of detection of 110 pM, and the flow rate sensitivity of -0.13 nm/(μL/s), respectively, were achieved. More importantly, a re-calibrated method involving simultaneous measurement of the core mode and the wavelength interval was used to compensate for the flow rate, and the accuracy of the Benzo[a]pyrene detection improved significantly. Thus the technique appears to have potential applications in chemistry, medicine, and biology.