Session Index

Quantum photonics has advanced rapidly and become a promising technology for realizing various state-of-the-art quantum devices and systems advantageous for, e.g., communications, information processing, computing, and sensing applications. Various kinds of optical elements have been developed as building blocks using photonic integrated circuits (PIC) technology for different applications. For example, PIC has been widely used in the implementation of chip-based photonic quantum circuits where different building blocks like qubit sources, linear optical circuits, modulators, and even single-photon detectors are intended to be integrated in a common substrate. Such a powerful integrated scheme has been applied to build photonic circuits for the creation, manipulation, and test of quantum entanglement states from the generated qubits as well as in implementing a reprogrammable logic gate circuitry for quantum computing. Lithium niobate (LN), renowned as “the silicon of photonics”, has been long a popular material widely used in integrated-optical and nonlinear-optical applications. A great variety of passive and active photonic elements have been realized in the LN platform. Recently, a novel material based on high-quality single crystalline films of LN has been developed and soon draws enormous attention for its greatly promising ability to realize nanoscale integrated photonic circuits/devices in this iconic optical platform.

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In this work, we first break the parity symmetry to induce topological phase transition and further investigate topological edge state lasing for it can be immune to defect and possess robustness. We break the parity symmetry by expanding and shrinking the airholes on honeycomb lattices. By combining them, topological edge state and special lasing state are observed with and without grating coupler, respectively. Furthermore, topological edge state demonstrates chiral characteristics, with two states propagating in opposite directions. It is the topological edge state with these traits that advances the research in integrated photonic devices.

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Period-one (P1) nonlinear dynamics of semiconductor lasers can be induced when subject to external optical injection. By analyzing how P1 dynamical states with different characteristics respond to perturbation superimposed onto the external optical injection, the stability and instability of the lasers at P1 dynamics are experimentally investigated.

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Tracking biomolecules is important in the biomedical field for unraveling the intricacies of various cellular processes. Conventional fluorescence-based imaging methods rely on a potentially harmful click-reaction to attach fluorophores to target biomolecules. These relatively bulky labels not only disrupt native bio-systems but also introduce issues such as photobleaching and phototoxicity, restricting their utility in live and long-term observations. Stimulated Raman scattering (SRS) has emerged as a promising solution for directly capturing the chemical information of biomolecules. Here, we visualize de novo synthesis of RNA at both cellular and tissue levels, exemplified with alkyne-tagged U2os cells and Drosophila larvae brain.

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MAPbBr3 perovskite nanofibers were synthesized using the uniaxial electrospinning method. A blend of PAN and PMMA polymers was used as the matrix to achieve a balance between stability and optical performance. The resulting nanofibers exhibited a distinct bamboo-like structure. These perovskite nanofibers, encapsulated by polymers, demonstrated robust and stable fluorescence even after immersion in water for extended periods. Notably, these MAPbBr3 nanofibers formed at the junctions of the bamboo-like fibers, exhibiting lasing effects under pulsed laser excitation. The observed waveguide lasing behavior was attributed to the Fabry-Pérot (FP) cavity when the excitation power exceeded the threshold.

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In this manuscript, we overcome the lattice mismatch between the AlGaAs distributed Bragg reflectors and Germanium substrate and successfully fabricate Germanium-based 940-nm vertical-cavity surface-emitting lasers (Ge-VCSELs) with an 8 μm oxide aperture. Also, we provide a comprehensive analysis of the static performance of the device, operated at a bias current of 7.5 mA, exhibits an optical output power of 1.4 mW, a slope efficiency of 0.312 W/A, a wall-plug efficiency of 0.1093, and a roll-over current is 22 mA.

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Despite the challenges associated with implementing a distributed-feedback Bragg reflector for VCSEL in the short-wavelength infrared (SWIR) range, there has been a growing demand for surface-emitting lasers operating within this spectral range. We successfully demonstrate the operation of 1580 nm photonic-crystal surface-emitting lasers (PCSELs) with an impressive slope efficiency of 0.46W/A, and the divergence angle of the output beam is about 1 to 2 degree. Additionally, we conducted a comparative analysis of PCSELs with different photonic crystal patterns to explore their performance characteristics.

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