Session Index

This study reports the optically and electrically controllable electro-optical characteristics of dichroic dyes-doped cholesteric LCs.
This LC device has advantages of electrically controllable absorption state, scattering state, and dynamic structures of Williams Domains.
The LC device forms different types of dynamic structures by utilizing the photo-isomerization of the doped azobenzenes.

 

we demonstrate a novel approach to improve device performance of QLEDs by blending an additive BYK-P105 into PEDOT:PSS as the hole transport layer. In addition, the PEIE -modified zinc oxide nanoparticles as the electron transport layer was firstly applied in regular-type QLEDs.

 

We use electron beam lithography and ICP-RIE dry etching to fabricate a coupled microdisk structure on an InGaAs quantum dot wafer. Based on parity-time symmetry theory, selectively optical pumping on the microdisk laser is performed to investigate the emission modes.

 

In this paper, we demonstrated two different package structures of hybrid perovskite quantum dots light emitting diodes with stable and continuous light emission. Besides, by using boron nitride nanoparticles, the lifetime of device is expected to be thousands of hours.

 

Photoelectrochemical water splitting is one of the green technologies for the hydrogen production. The hematite is a good photoanode because of its stability and short band gap. In this study, we fabricate hematite nanoantennas to enhance the efficiency of water splitting by tuning electric dipole mode and magnetic dipole mode.

 

We proposed a novel concept to design the transmissive metalens that manipulate the phase by adjusting the height of the unit cell. The polarization-independent metalens operating at 0.55 um for unpolarized incident light and focusing on 12 um along longitudinal direction is demonstrated.

 

In this study, we demonstrate a cost-effective, simple, and anisotropic etching method to fabricate periodic nanostructures with high-aspect ratios and regulatable tilt angles. We patterned various periodic nanostructures by UV imprint lithography. Then, nanocones with various heights and angles were achieved by Metal-assisted chemical etching (MACE).

 

A new optical memory with electrical writing and optical reading functions which is constructed by integrating the resistive random-access memory (ReRAM) with the vertically-coupled microdisk resonator is duly investigated. The results demonstrate the output spectra of the microdisk resonator are intimately related to the different memory states of ReRAM.

 

Tamm plasmon polariton (TPP) resonance is observed in the band gap of 1D photonic crystal (DBR) coating with metals. Due to the sharp resonance, TPP shows a high sensitivity for gas sensing at the visible wavelength.

 

The ZnO nanorod (NR) was grown by hydrothermal method and the cuprous oxide was deposited on ZnO NR by electrochemical, then the Au nanoparticles were modified. Finally, the characteristics and sensitivity were analyzed by electrochemical measurement and be applied to non-enzymatic glucose biosensor.

 

Plasmonic nanostructure has increased color printing. However, due to the loss of metals, the color display coefficient is limited. To achieve low material loss and high refractive index, silicon nitride is a good candidate. With the dielectric nanostructure, the high saturation and vivid color can be achieved.

 

Optical Sensors supported by Bloch Surface Waves (BSW) offer interesting advantages for sensing compared to Surface Plasmon Resonance (SPR), because of strong field enhancement and narrower resonance without Ohmic losses inherent in SPR. SERS measurement from AuNPs shows two orders of magnitude enhancement which opens up more prospects for Raman.

 

Strong interactions, better electromagnetic field confinements, and less leakage into the substrate for vertical SRRs are found. So, we can found a 2.6-fold enhancement of SHG nonlinearity for vertical SRRs.

 

Surfactant-assisted photoreduction using ferroelectric templates are presented for the first time. The selective coverage of the surfactant on the {100} lattice planes promotes the growth of nanoplates and enhances the uniformity of nanoparticle size. The proposed SERS substrate owns 12 times larger Raman signal enhancement compared to the conventional samples.

 

We use a micro-emulsion strategy to synthesize FAPbBr3 perovskite quantum dots (PeQDs); The photoluminescence quantum yield (PLQY) can reach 91.19%. Further, the as-prepared PeQDs are used for fabricate quantum dots light-emitting diodes (QD-LEDs) as the emission layers. Additionally, Au nanoparticles are blended into the QD-LED for triggering the plasmonic effects.

 

Coupled micro-pillar lasers are fabricated by using MBE-grown InGaAs QD wafer. The vertical cavity is formed by top metal and bottom DBR. EL measurement shows a single emission peak at λ=1178nm , and the quality factor of Q=1300.

 

We demonstrate the potential to control the light-matter interaction by the stereo-geometry in space. Comparing to planar SRRs, the vertical ones give electric and magnetic dipoles radiation power 15 and 320 times enhancement, respectively. Moreover, through radial symmetrical stacking, the absorption up to 97.5% in every polarization is also performed.

 

In this study, the Mg–Cu-co-doped p-type GaN film is deposited by co-sputtering on an amorphous glass substrate with a zinc oxide buffer layer. In addition, the Hall measurement results show a low resistivity of 9.98 × 10−3 ohm-cm and a high hole concentration of 8.25 × 1022 cm3.

 

We successfully demonstrate grating-based reflective spatial filtering devices which present the periodic modulation of the refraction index on the sub-micron scale. the proposed device exhibits the optical beam shaping with transverse invariance and high efficiency, which serves as a versatile tool for narrowing beam.

 

Directional excitation of surface plasmons polaritons (SPPs) has been investigated in recent years. To achieve high extinct ratio of directional SPPs, we design an add-on nanostructure to a nanoslit. The results show the extinction ratio ~ 4 between 600 nm to 700 nm.

 

we present a theoretical investigation of the excitonic fine structures of transition-metal dichalcogenide monolayers (TMD-MLs) by solving the density-functional-theory-based Bethe-Salpeter equation. As a main result, we reveal the optical signatures of the optically inactive dark excitons in TMD-MLs underlying in the optical spectra.

 

We investigated the dynamics of THz photoacoustic pulse generation in ultra-thin Au film. Our results indicate that Au would get soften when the thickness down to only a few nanometers. Furthermore, we attribute lattice anharmonicity in thermal expansion as the driving force for photoacoustic pulse generation in ultrathin Au films.

 

In this study, we present area-dependent electrical characteristics of single-layered DNA biopolymer devices. Various switching curves of biopolymer devices with different areas are presented, and morphological characterization show area-dependent filament formation behaviors that may be responsible for the area-dependent electrical characteristics.

 

The characteristics of the CNT acetone gas sensors are measured at room temperature. The sensitivity of the device increased from 0.51% using CNTs without Ag NPs to 1.61% with Ag NPs, under a 50 ppm ambient acetone gas concentration. The fabricated devices are favorable for gas detection applications.

 

This study investigated the influence of photoalignment on the electrophoretic movement of silica nanoparticles in liquid crystals doped with azo dyes. The photoalignment suppressed the electrophoretic movement of silica nanoparticles from the adsorption of azo dyes on silica networks, causing vertically aligned LCs in a hybrid aligned nematic cell

 

Helical nanostructures attract great attention for their exotic optical properties. In this study, we present the coupling effect of circularly polarized light by virtue of 3D spatial arrangement of helical nanostructures. The unique interaction leads to high-Q reflection of circular polarization, which may find applications in sensors and nonlinear optics.

 

Wide-direct-bandgap semiconductors have attracted much attention. This work prepared three such films by sputtering and investigated their physical and photodetection properties. The developed ZnO, NiO, and CdS thin films achieved the maximum responsivities of 323, 85, and 1.8 A/W at 354, 310, and 446 nm, respectively.

 

Amorphous structures attracted attention owning to structural coloration observed in many natural species. In this study, two different methods are used to control the randomness of amorphous tripod networks for structural and optical characterizations. Our results revealed two critical factors associated with gap formation and possible mechanisms are discussed.

 

Here, we present an organic photo-capacitor especially for sensing applications in chemical and biological fields. Although structurally similar to existing potentiometric sensors, the organic semiconductor used as active layer in the device offers unprecedented advantages as an effective sensor, which has been demonstrated here by precisely measuring various pH solutions.

 

Numerical investigation of the resonant peak by modifying the number of protruded metal nanorods and the core material in metal nanoshells are explored. A strong and tunable field coupling and enhancement effects corresponding to the transverse surface plasmon resonance and cavity plasmon resonance modes are observed.

 

A theoretical framework and formulation for calculating Si interband and intraband absorption coefficients are presented and discussed in this work. They are based on the second-order time-dependent perturbation theory of quantum mechanics which incorporates interactions matrices between electrons, photons, phonons, and charged impurities.

 

Via the metallic nanopaticles incorporated into single-crystalline organometallic perovskite bulks, the hybrid perovskite-nanoparticle compositions exhibit power-dependent optical performance which may result from the resonant energy transfer and the optical scatterings among the plasmonic nanoparticles and perovskite molecules. Nanoparticles with different materials and concentrations are also investigated.