Session Index

Plasmonic metamaterials may be constructed by an ensemble of photonic structures via the systematically rational design with corresponding optical responses from the collectively electromagnetic resonance. In this study, we investigated the spectral representations of several nano-objects digitally addressed in a constrained area with translational and rotational regulations.

 

Cholesteric liquid crystals have selective reflection because of its periodic structure. In this study, we used 405 nm laser and 532 nm laser to modulate the reflection band of azobenzene-doped cholesteric liquid crystals (Ad-CLC). Moreover, we can broaden the bandwidth of Ad-CLC by increasing the intensity of two lights.

 

We numerically examine the effectiveness of effective medium theory (EMT) for multilayer hyperbolic metamaterial (HMM). Reflectivity of a multilayer structure and reflectivity of the effective structure are compared. As the number of layers increases, both results agree gradually, indicating that EMT works if there are more layers in the HMM.

 

In this study, a copper-zinc-tin-sulfur (CZTS) absorber layer was investigated. The sulfurization temperature and sulfurization time required to obtain a CZTS film with an optimal material performance were determined for CZTS films with optimal elemental compositions.

 

In this work, The p-type SnO films were adopted to the fabrication of p-type TFTs. The results show the superior performance of high ION/IOFF of 1.3 × 106, a low Nit of 1.1×1012 cm-2, the VTH of 7.5V, and μ of 1.4 cm2 V-1 S-1 for the p-type TFTs.

 

We propose a new ferroelectric-nanotip-equipped SERS substrate produced by proton exchange and chemical etching. The strong electrostatic field induced by ferroelectric nanotips with spontaneous polarization through lighting rod effect effectively promotes the growth of silver nanoparticles. The proposed SERS substrate owns 5.51 times Raman signal enhancement compared to conventional samples.

 

We demonstrated the new type counter electrodes consist with carbon black and cobalt complex material in dye-sensitized solar cells. The cobalt derivative, CoCB, combine the high conductivity of carbon black and the high redoxing ability of cobalt core, resulted in similar performance to the device with Pt electrode.

 

We studied the photothermal and optomechanical deformation of a gold nanoparticle (NP) irradiated by a linearly polarized light. MMP method was used to simulate the optical traction upon the surface of NP. The photothermal heating makes the NP softened, and then optical traction deform it to be elongated.

 

The optomechanical trapping of a fixed two-dimensional gold nano-array on a dielectric nanoparticle (NP) induced by a linearly polarized Gaussian beam is studied. The 3D streamline of optical force on the NP shows the trapping behaviors on the front and back sides of the nano-array relative to the Gaussian beam.

 

Based on highly Ga-doped ZnO thin films of different thicknesses on sapphire substrate, grating structures of different grating ridge depths but with a fixed grating period at 1100 nm are fabricated for studying their surface plasmon polariton and localized surface plasmon resonance behaviors through the reflection and transmission measurements.

 

Facile synthesis and characteristics of CsPbBr3/Cs4PbBr6 composite luminophore were demonstrated. By adding proper antisolvent, the composite powder with production yield > 90% was derived from the CsPbBr3 powder. Via characterization, high quantum yield of the fluorescence from the composite should originate from the CsPbBr3 nanocrystals embedded in the Cs4PbBr6 matrix.

 

We presented a novel metamaterial absorber design which is composed of metal-dielectric-metal layers. The light-absorption band was found to cover from 470 nm to 570 nm with average absorptivity of 98.36%. Such feature was identified from the resonant coupling of sandwiched structure that contributed to the near-perfect absorptivity.

 

All-inorganic perovskite nanocrystals were applied as a color conversion layer (CCL) of a white light-emitting-electrochemical cell (LEC). A laser-scanning method was proposed to manipulate the optical properties of this perovskite CCL. Consequently, the correlated color temperatures of the white LEC were widely tuned by controlling the scanning parameters.

 

High luminescence Sr2MgSi2O7:Eu2+ phosphor was synthesized by co-precipitation method at 1150°C for 11 h. Under UV excitation at wavelength of 337 nm, the Sr2MgSi2O7:Eu2+ exhibited bright-blue emission with peak at wavelength of 486 nm, which is potential for white light-emitting diode application and can be used in latent fingerprint detection.

 

Photoluminescence (PL) emitted by MEH-PPV is sensitive to the degree of oxidation of graphene. In this work we oxidized graphene and correlated changes in intensity, spectra and lifetime of PL with the amount of oxidation.

 

We reported a phenomenon of negative differential resistance (NDR) with a typical value of peak to valley current ratio ~5 on ITO/ nitrogen doped Ga2O3/Si diode. The carrier transport mechanism ascribed to a combined effect of charge detrapping and neutralization processes as one sweeps the voltage polarity.

 

The conventional buffer layer of CdS is hazardous for the environment due to the toxic nature of the cadmium. The Cd-free ZnS film is a good candidate as an alternative to the CdS. We used the two steps method to sulfuret the Zinc thin film which was prepared by sputter-deposition.

 

In this work, the p-type molybdenum disulfide (p-MoS2) quantum dots (QDs) prepared by microwave-assisted synthesis were used to fabricate Al/p-MoS2 QDs/Al metal-semiconductor-metal (MSM) photodetors (PDs)

 

In this thesis, the fabrication of a multimode tapered fiber is presented. The coating and cladding of the fiber were removed by using the CO2 laser and then the ability of the fabricated tapered fiber to detect the refractive index of surrounding media is investigated.

 

The orbital rotation and spins of three Ag nanoparticles (NPs) driven by a circularly polarized Gaussian beam were studied. We used MMP to simulate the optical force upon NPs at an off-focal plane. Results show that a triangular pattern is formed to make an orbital motion with spin.

 

In this study, the ultra-thin Aluminum-doped ZnO (AZO) layer had been deposited by RF magnetron sputtering with intermittent process to enhance the quality of thin film, which can effectively improve the optoelectronic properties of ultra-thin AZO layer to apply on Light Emitting Diode

 

ZnO nanorods were researched and synthesized on glass substrate by the Wet Chemical Bath Deposition method at low temperatures. Gold nanoparticles are fabricated and attached to previously grown ZnO nanorods by laser. Surface-enhanced Raman Scattering (SERS) was proved by using a Rhodamine 6G (R6G) chromophore on Au-ZnO nanorods obtained.

 

We demonstrate using reflection and transmission micro-spectroscopy to efficiently and unambiguously determine the thickness of few-layer TMDC flakes and their excitonic resonance features. We compare this technique with typical methods, such as Raman, and photoluminescence spectroscopy. The thickness of the nanocrystals are confirmed by AFM.

 

We fabricated zinc oxide nanorods on different substrates for SERS application, using sol-gel method and chemical bath deposition. The thickness of the seed layer and the annealing temperature have significant effect on the morphology and optical property of the obtained nanorods and the SERS performance of the substrate.

 

The out-coupling of the conventional LEDs is typically limited since the optical confinement inside the device. An insect wing-structured layer was biomimetic fabricated and applied on the LEDs device. Not only the reflection at the interface between air and glass was reduced, but the luminous efficiency was also enhanced.

 

Copper oxide, silver oxide, cobalt oxide and nickel oxide thin films/nanostructures have been successfully deposited by reactive ion beam sputter deposition utilizing an integrated anode layer ion source ion beam sputter module. Experimental results show that crystalline quality, stoichiometry and surface morphology can be precisely controlled.

 

To find the best substrate parameters for Raman signal enhancement, we use different etching times to obtain different roughness of the surface of the material. This structure can let surface scattering of metallic nano structures and increase the local light field to cause the Raman signal enhancement mechanism.

 

We show several cationic iridium complexes exhibiting near-infrared (NIR) electroluminescence (EL) peak up to 850 nm. Peak external quantum efficiency (EQE) of 0.05% can be obtained in neat-film NIR light-emitting electrochemical cells (LECs). By using the host-guest strategy, peak EQE of the NIR LEC can be further enhanced to >0.1%.

 

Rapid thermal CVD is applied to deposit graphene nanodots and islands on copper. Graphene is then applied as a template for the nanofabrication of silver-based SERS molecular sensors with very high SERS enhancement factors for the detection of low concentration of R6G and adenine molecules.

 

Parameters of direct tunneling model in Sentaurus TCAD are derived. The experimental data is in agreement with the tunneling model. Tunneling width is only approximated 7.95% of the depletion width. Verification of the tunneling model is presented.

 

In this study, dye-sensitized solar cells (DSSCs) were fabricated and AuNPs were modified TiO2 film by using the self-assembly method with different time. The photoelectric conversion efficiency (PCE) of DSSCs for gold nanoparticle modified photoanotde with assembly time of 2 hours were improved by about 26% higher than pure TiO2.

 

In this study, we focus on the ZnO nanowire with Ag nanoparticles (NPs) to observe the nanoscale properties by Taiwan Photon Source (TPS)23A X-ray nanoprobe beamline. The Ag NPs will increase emission performance of the ZnO with localized surface plasmon resonance mechanism.