Session Index

This study presents finding on the exceptional plasmonic characteristics of 2D Ti3C2Tx MXenes in the short-wave infrared (SWIR) range. We report the discovery of a strong plasmonic effect through acoustic plasmon modes, resulting in a significant reduction of the operating wavelength in the SWIR region that exceeds the performance of conventional 2D materials. Utilizing this breakthrough, we achieved an unprecedented nonlinear absorption coefficient of 1.37 × 10^(-2) m/W at a 1.56 μm wavelength. These unique optical properties are attributed to MXene's high electron density and distinctive two-dimensional structure.

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Metasurfaces, comprised of subwavelength structures which provide the capability
for arbitrary phase manipulation of electromagnetic waves, have been developed for decades to
replace conventional and bulky optical components. Recent development of “J-plates” achieve
distinct orbital angular momentum (OAM) states for two arbitrary orthogonally polarized
incident beams. However, the operating wavelength of most J-plates are in the visible. Here, we
experimentally demonstrate a J-plate operating at 940 nm that generates the high-quality vortex
beams with different OAM states. This device has the potential applications in various optical
fields, including near-infrared optical communication and stimulated emission depletion (STED)
microscopic imaging.

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We design and fabricate grating emitters with unidirectionality and high angular dispersion. We break the symmetry between top and bottom emitting directions by choosing SU-8 as the top cladding. The refractive index contrast between the top cladding (SU-8) and the bottom cladding (SiO2) allows the phase-matching condition to be satisfied only for upward diffraction. The design is verified with finite-difference time-domain (FDTD) simulation. We measure unidirectionality of 83% and angular dispersion of 0.809°/nm from the fabricated device.

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This research introduces a novel approach for mass production of high refractive index TiO_2 composite UV-resin for terahertz (THz) regime tailored for Masked Stereolithography (MSLA) 3D printing enabling versatile design of compact THz passive devices. Its careful formulation process balances a heightened refractive index (n=1.9) in THz regime while retaining low absorption coefficient, yielding impressive performance and compactness in a THz plano-convex lenses and other THz passive devices. This advancement holds vast potential for diverse, cost-effective applications in compact THz telecommunication and imaging systems, presenting an exciting leap forward in 3D printing technology.

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By substituting the heavy Cs element at the A sites of perovskite quantum dots (QDs), highly luminescent FA1-xCsxPbBr3 QDs is synthesized using a room temperature ligand-assisted re-precipitation method. The QD powder is blended with polydimethylsiloxane (PDMS) and employed as a scintillator, resulting in increased photoluminescence (PL) under X-ray illumination (radioluminescence). Utilizing PDMS for the fabrication of QD films provides effective protection from moisture and oxygen. High-quality X-ray images are obtained using these scintillators prepared with perovskite QDs.

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High-power multiple cascaded lasers based partially-corrugated-grating (PCG) DFB structures are advanced to overcome the challenging issues of on-board light sources for co-packaged optics (CPO) applications. With the systematic design of multi-section PCG-DFBs, the device could preserve a single-wavelength operation, high side-mode suppression ratio (SMSR), and low relative intensity noise (RIN). This provides the high-reliability and high-efficiency in implementing cascaded DFB lasers to improve the performance and enhance the output power. By designing a grating ratio of 0.4 and five segmentations, the laser can provide >13.8% improvement in output power, >231 mW output, <-151.75 dB/Hz RIN, and >0.4395 mW/mA slope efficiency.

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There is a common belief that the inherent dispersive phase-matching nature and the imperfect collimation of the typically used thermal sources restrain the performance of the photonic crystal guided resonance (PCGR) in mid-infrared, the spectral domain of fundamental importance to vibrational molecular spectroscopy [Wu et al., Nat Commun 2014, 5, 3892]. Here, we question this belief and numerically demonstrate a high angular tolerance of the dielectric PCGR in mid-infrared by judiciously engineering its dispersion.

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