Session Index

A change in density due to increase in temperature is one of the basic characteristics of a material and change in density can also leads to change in the refractive indices. This phenomena can be used in a controlled way to fine tune Localized Surface plasmon resonance(LSPR). In our work we fabricate an on-chip microheater where the temperature depends on the input voltage. In this work the LSPR is fine tuned indirectly by applied voltage with changing surface temperature. The outcomes of this experiment are also verify and reconfirmed by heating the substrate externally.

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We reported a broadband reflector based on polymer-stabilized cholesteric liquid crystals whose bandwidth is broadened by applying the direct current (DC) bias and then photo-polymerizing. The reflection band can be further extended toward the longer wavelengths by applying the DC voltages.

 

We demonstrate a tunable scan lens based on a 30-element optical phased array on the InP integrated photonic platform. We develop a phase calibration procedure based on the genetic algorithm, which optimizes the driving signals of the optical phased array to form focused spots. We show dynamic scanning of the focused spot, including changing the focal length to 100 μm and 75 μm, as well as introducing different lateral offsets. The minimum measured spot size is 2.72 μm, which matches well with the simulation.

 

We calculate the optical characteristics such as band structures and transmission and
reflection of plasmonic crystals with square lattices by using the finite difference time domain
method. The time-domain method provides a stable calculation of band structures for lossy
materials such as metals. We applied random source excitation to find all the possible modes.
Such an approach is advantageous in finding localized modes. We obtain the band structures of
the plasmonic crystals and the reflectance and transmittance of the plasmonic crystals both in the
TE and TM cases.

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Lead-free cesium tin halide (Cs2SnBr6) double-perovskite nanocrystals (DPNCs)
having cubic symmetry were synthesized and investigated. The prepared DPNCs and blue
phosphor were mixed with polydimethylsiloxane packaging in 365 nm UV light emitting
diodes (LEDs), which were used to fabricate environmentally friendly candlelight LEDs.

 

We fabricated a InGaAsP microdisk cavity with a photonic crystal feedback waveguide nearby and further investigated the lasing characteristic between it and a microdisk laser. The enhancement in the circular polarization degree of laser emission is achieved by integrating the microdisk laser with the waveguide.

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We measure the transverse band gap of blue phase liquid crystal(BPLCs) by observing the reflection spectrums of BPLCs through the fiber-assisting measurement system. By analysing the change of spectrum caused by temperature or electric field, we can verify the photonic band gap(PBG) model of BPLCs

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How to develop efficient red-emitting organometallics of earth-abundant copper(I) is a formidable challenge in the field of organic light-emitting diodes (OLEDs). Here, a red Cu(I) complex, MAC*-Cu-DPAC, was developed in a carbene-metal-amide motif, achieving satisfactory red emission, a high photoluminescence quantum yield of up to 70%, a high horizontal dipole ratio of 77%, and a sub-microsecond lifetime. The resulting OLEDs delivered high external quantum efficiencies of 21.1% at a maximum and 20.1% at 1000 nits, together with a red emission peak at ∼630 nm. These values represent the state-of-the-art performance for red-emitting OLEDs based on coinage metal complexes.

 

We demonstrate 1D photonic crystal (PhC) lasers embedded in a polymeric thin film, which can attach to any object's surface. Owing to this feature and the nanoclamp design with strain shaping, the PhC laser inside shows significant wavelength responses to the applied bending and pressing in experiments.

 

We propose a novel Archimedean spiral plasmonic lens (ASPL) consisting of a spiral slit and multiple circular grooves for far-field focusing. The simulation results show the focusing properties can be modulated by different arrangements of the groove widths. The ASPL with decreased groove width design exhibits the largest focal length of 1.26λ, the strongest focusing intensity, and subwavelength resolution of 0.42λ.

 

We carried out a comparative study to evaluate the feasibility of gold nanosphere and nanodisk to enhance the deep-red emitter emission. As a result, gold nanospheres and nanodisks with diameters greater than 50 and 60 nm are suitable for increasing the deep-red emitter quantum yield, respectively. Interestingly, nanodisks show greater radiative enhancement than nanospheres.

 

Hybrid Ag/Au/AgCl nanomaterials are successfully synthesized by photoreduction using the ferroelectric template. The Raman signals are effectively enhanced by electromagnetic and chemical mechanisms. The superior performance includes the limit of detection as low as 1.57×10^-9 M and the ultra-high enhancement factor of 6.92×10^9.

 

We produce the distributed feedback (DFB) laser from dye covered biopolymer with one dimensional grating. Through the pump of Q-switched laser, the emission peak and FWHM of DFB laser are 583.2nm and 0.30 nm . After embedding of silver nanoprisms The blue shift of emission peak and narrowing of linewidth have been produced.

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With the advent of two-photon polymerization, a direct laser writing is unique, flexible, and cost-effective fabrication technique for three-dimensional structure. In this paper, we have demonstrated the customized structures, such as grating、microfluidic and spiral suspension structures for many applications in the diversified scientific and industrial fields.

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The plasmonic Ag nanoparticles are photoreduced using ferroelectric templates and effectively transferred to the PMMA film by a peel-off process for the parathion detection on curved surfaces. The produced flexible SERS substrate owns intensive hotspots with ultra-low limit of detection 1.76×10^-9 M and high enhancement factor 3.25×10^8.

 

In this study, the Ga2O3 thin films were grown on sapphire substrate by RF magnetron sputtering and hydride vapor phase epitaxy technique. Then, the metal-semiconductor-metal (MSM) photodetectors were fabricated and the optoelectronic properties were studied. The Ga2O3 photodetector using hydride vapor phase epitaxy technique exhibits lower dark current and better photo responsivity.

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In this research, we demonstrate hybrid plasmonic waveguide (HPWG) have lower propagation losses and higher effective refractive index than the metal-insulator-metal (MIM) plasmonic waveguide, but still provide high confinement characteristic.