We demonstrated a high-power (474 mW) blue superluminescent diode (SLD) on c-plane GaN-substrate for speckle-free solid-state lighting (SSL), and high-speed visible light communication (VLC) link. The device, emitting at 442 nm, showed a large spectral bandwidth of 6.5 nm at an optical power of 105 mW. By integrating a YAG-phosphor-plate to the SLD, a CRI of 85.1 and CCT of 3392 K were measured, thus suitable for solid-state lighting. The SLD shows a relatively large 3-dB modulation bandwidth of >400 MHz, while a record high data rate of 1.45 Gigabit-per-second (Gbps) link has been achieved below forward-error correction (FEC) limit under non-return-to-zero on-off keying (NRZ-OOK) modulation scheme. Our results suggest that SLD is a promising alternative for simultaneous speckle-free white lighting and Gbps data communication dual functionalities.

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Combining different therapies into a single nanomaterial platform is a promising approach for achieving more efficient, less invasive and personalized treatments. Here, we report on the development of such a platform by utilizing nanowires with iron core and iron oxide shell as drug carriers and exploiting their optical and magnetic properties. The iron core has a large magnetization, which provides the foundation for low-power magnetic manipulation and magnetomechanical treatment. The iron oxide shell enables functionalization with doxorubicin through a pH-sensitive linker, providing selective intracellular drug delivery. Combined, the core-shell nanostructure features an enhanced light-matter interaction in the near-infrared region, resulting in a high photothermal conversion efficiency of >80% for effective photothermal treatment. Applied to cancer cells, the collective effect of the three modalities results in an extremely efficient treatment with nearly complete cell death (~90%). In combination with the possibility of guidance and detection, this platform provides powerful tools for the development of advanced treatments.

Group III-nitride semiconductor materials especially AlGaN are key-emerging candidates for the advancement of ultraviolet (UV) photonic devices. Numerous nanophotonics approaches using nanostructures (e.g., nanowires, nanorods, and quantum dots/disks) and nanofabrication (e.g., substrate patterning, photonic crystals, nanogratings, and surface-plasmons) have been demonstrated to address the material growth challenges and to enhance the device efficiencies of photonic devices operating at UV wavelengths. Here, we review the progress of nanophotonics implementations using nanostructured interfaces and nanofabrication approaches for the group III-nitride semiconductors to realize efficient UV-based photonic devices. The existing challenges of nanophotonics applications are presented. This review aims to provide analysis of state-of-the-art nanophotonic approaches in advancing the UV-photonic devices based on group III-nitride semiconductors. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

Group-III-nitride superluminescent diodes (SLDs) 7 are emerging as light sources for white lighting and visible light 8 communications (VLC) owing to their droop-free, low speckle 9 noise, and large modulation bandwidth properties. In this paper, 10 we discuss the development of GaN-based visible SLDs, and ana-11 lyze their electro-optical properties by studying the optical power-12 bandwidth products and injection current densities. The significant 13 progress in blue SLDs and their applications for white light VLC is 14 highlighted. A blue SLD, with an optical power of >100 mW and 15 large PBP of 536 mW•nm, is utilized to generate white light, result-16 ing in a high color rendering index (CRI) of 88.2. In a modulation 17 experiment designed for an SLD-based VLC system, an on-off key-18 ing scheme exhibits a 1.2 Gbps data rate, with a bit error rate of 1.8 19 × 10 −3 , which satisfies the forward error correction criteria. A high 20 data rate of 3.4 Gbps is achieved using the same SLD transmitter, 21 by applying the 16-quadrature-amplitude-modulation (16-QAM) 22 discrete multitone modulation scheme for high-speed white light 23 communication. The results reported here unequivocally point to 24 the significant performance and versatility that GaN-based SLDs 25 could offer for beyond-5G implementation, where white lighting 26 and high spectral efficiency VLC systems can be simultaneously 27 implemented.