Session Index

Since 2011, our group has been working on the trapping and analysis of proteins with nanoapertures in metal films. This talk will review the technique, recent advances (including tracking proteins, trapping proteins down to 4 kDa, analysis of the impact of mutation), and briefly highlight exciting developments from others in the field.

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Surface plasmons offer advantageous properties for enhancing light-matter interactions, primarily through their ability to tightly confine light fields. By employing metallic nanoholes as the plasmonic nanocavity and InP nanowires as the gain medium, we have successfully achieved lasing of localized surface plasmons at room temperature, making them highly suitable for communication applications. Additionally, our plasmonic nanolasers demonstrate superior features such as elevated spontaneous emission coupling factors, reduced mode volumes, and decreased power consumption, all attributed to the enhanced interactions between light and matter.

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We propose high-bandwidth white-light emitting diodes (WLEDs) that combine a single-pixel semipolar (20–21) blue micro-LED, a phenothiazine/dimesitylborane-based organic blue emitter (CC-MP3), green-emitting CH3NH3PbBr3 perovskite quantum dots (PQDs), and a commercially available red-emitting phosphorescent emitter (Ir(fbi)2(acac)) for visible light communication (VLC) and lighting applications. By designing the color conversion layers appropriately, the WLEDs achieved a bandwidth ranging from 952 to 1008 MHz, a CCT ranging from 4000K to 6000K, and a CRI ranging from 61.3 to 82.4. Moreover, PQDs and CC-MP3 were significantly stable in optical and frequency response performance after 180 days of storage.

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Exceptional points (EPs) are singularities in non-Hermitian systems where eigenvalues and eigenstates merge. This allows for unique control of asymmetric light, limited by EP chirality. Here we introduces a method to extend this control to any polarization by engineering EP pairs. Our plasmonic metasurface features chiral degenerate eigenstates for circular polarization at EPs, resulting in asymmetric reflection for all circular polarizations. Manipulating chiral EP handedness within the metasurface enables control of arbitrary polarizations, overcoming topological metasurface constraints. Furthermore, we utilize EP pairs and rotation-induced phase to create versatile vectorial holographic images, offering innovative wave control possibilities in photonics applications.

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In this study, tungsten trioxide (WO3) nanorods were grown using hydrothermal synthesis method as the sensing membranes of NO gas sensors. The performance of the NO gas sensors using WO3 nanorod sensing membranes could be improved by annealing in the hydrogen (H2) ambience at 400 oC for 15 min. The optimal responsivity of the NO gas sensor was 2305.2% under NO concentration of 1 ppm and operation temperature of 140 oC.

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The forward design process could be cumbersome and limited by the human imagination when it comes to exploring complex shapes to achieve optimal performance. However, inverse design allows us to break free from those limitations and design unconventional and simple patterns. In our work, we leverage the power of inverse design to optimize the geometric layout of metagratings, enabling us to achieve higher efficiency compared to conventional forward-designed gratings. We also optimize non-orthogonal polarization pairs and achieve similar results as forward design methods could achieve with orthogonal polarization states, which expand functionality and could further apply to polarization camera.

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Vector vortex beams (VVBs) have garnered considerable interest owing to their unique polarization properties, opening up new possibilities for innovative applications in optics and communication. There has been a persistent desire to find an effective method for dynamically switching the topological charge of VVBs. In our study, we successfully generate VVBs with topological charge (TC) of +1 and -2 in hexagonal-lattice PCSELs. Moreover, we achieve dynamic modulation of the TC of VVBs by controlling the pulse duration, enabling us to switch between modes with varying TC values.

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