A white light Fourier transform spectrometer (WLFTS) was built based on a Michelson interferometer to detect a plasmonic biosensor with large-area gold nanoslit array structures. Transmission spectra were measured simultaneously with both WLFTS and a commercialized spectrometer for comparison. Detection under various refractive index liquids and protein-binding are demonstrated.

 Preview abstract

In this study, we used a simple method to fabricate high aspect ratio polymer nanohairs on polycarbonate substrate by nanoimprint. The height of the stretched nanopillars was influenced by the de-molding temperature and the original pillar diameter. The height of the PC nanopillars can be stretched to twice of their original size.

 Preview abstract

In this paper, we fabricated and characterized a linear variable filter based on a gradient grating period guided-mode resonance filter. The device only 6 mm in length has a filtering range of 410 nm from 506 nm to 915 nm.

 Preview abstract

We demonstrate the photodetector by growing two dimension transition metal dichalcogenides (bilayer MoS2) on patterned sapphire substrate. The different stains will cause peak shift in Raman and PL spectra, which can enhance the ability of electron collecting and provide broadband absorption. These characteristics make it become attractive for photodetector application.

 Preview abstract

In this paper, we demonstrate that by increasing the thickness of the buffer layer of a guided-mode resonance filter, the full-width half-maximum can be greatly reduced, resulting in the improvement of the overall figure of merit for biosensor applications.

 Preview abstract

In this study, the structure and optoelectronic properties of the finished AZO/CuO nano-wires/AZO thin film are studied. Structural characterization by high-resolution transmission electron microscopy (HRTEM) indicates that the CuO nano-wires are mainly single crystal phases. The optimum density for the CuO nano-wire structures is achieved by sputtering a 6 nm Cu thickness. This gives the lowest resistance of 1.4 × 10-4 Ω-cm and the average transmittance from 400-800nm is about 84%. The best figure of merit for the AZO/CuO nano- wires/AZO layer is 1.54×10-2 (Ω-1), which shows that the application of AZO on transparent conductive electrode is viable.

 Preview abstract

A silver hybrid nanostructure was proposed for metal enhanced fluorescence (MEF). We combined silver 2D periodic array with silver nanoparticles to form multiscale structures. The photoluminescence (PL) and time-resolved photoluminescence (TRPL) of DCJTB on the hybrid nanostructures were characterized to show the potential for the application of MEF.

 Preview abstract

We report a method to stabilize blue phase liquid crystals (BPLCs) by photo-polymerizing the doped chiral polymers at isotropic phase, indicating that no branched structures cross the LC bulk will be generated. The chiral polymers not only control the pitch length by light-illumination, but broaden the temperature range of BP-LCs.

 Preview abstract

We present a novel technique for the fabrication of surface enhanced Raman scattering (SERS) substrates with high enhancement ratio based on nanosphere lithography (NSL) on Polydimethylsilozane with lift-off. An enhancement ratio of 6.5 x 10^6 can be reached which surpasses the performance of all the other SERS substrates we reported previously using NSL.

 Preview abstract

Polarization rotation of linearly polarized light from one direction to other angles via exposure UV light based on chiral azobenzene-doped cholesteric liquid crystals (CLCs) is demonstrated. The effects of UV-illumination duration, polarization direction of incident light, wavelength, cell gap, and others onto the performance of such polarization rotator are examined.

 Preview abstract

In this study, an eco-friendly and ultrasensitive paper substrate is developed for surface-enhanced Raman scattering (SERS) with performance approaching single molecule detection. The limits of detection when using the paper substrates reach the attomolar level, thereby approaching single molecule detection.

 Preview abstract

ZnO nanorod arrays were grown through a hydrothermal route on glass and patterned sapphire substrates. The grown ZnO nanorods were characterized by x-ray diffraction and scanning electron microscopy analyses. The resulting UV photodetector achieved the high UV responses (Rdark/RUV) 15 on the patterned sapphire substrates.

 Preview abstract

This study develops a novel and sensitive fiber-optic vibration sensor that is based on a tiny section of hollow-core-fiber (HCF) fused a tapered-fiber-plug. The proposed technique ensures the sensing element is protected by the HCF. Experimental results show the sensor can achieve high frequency responses with a good identified SNR.

 Preview abstract

In this study, the textured surface of AZO is treated as a seed layer, which is expected to lead the uniform distribution of nano-Ag particles to deposit on the surface. Finally, the AZO(20nm)/nano-Ag/AZO(20nm) ultra-thin film had been grown as transparent conductive film. The results show that the resistance of ultra-thin film reduces to 4.67×10-5 Ω-cm and the average transmittance in the visible range increases to 88.7 %. The best figure of merit for the ultra-thin film is 2.84×10-2 Ω-1, which promote the application of AZO on transparent conductive thin film.

 Preview abstract

A framework is presented for an evanescent wave exciting a silicon nanosphere on glass substrate (n=1.52) under total internal reflection. From our study, the result shows the scattered direction can be effected by the evanescent wave extraordinarily and the forward/backward scattering ratio could be adjusted in different wavelengths.

 Preview abstract

We study the localized surface plasmon resonance (LSPR) of plasmonic Ag/SiOx:a-Si QDs/Ag sandwich nanostructures with subwavelength crossed Ag gratings on the top, using the three-dimensional rigorous coupled-wave analysis (3D RCWA) simulation. The novel LSPR properties applied in photonics and optoelectronics devices, have been intensively investigated both theoretically and experimentally.

 Preview abstract

Thin polymer composite fibers filled by a cholesteric liquid crystal (CLC) core are realized by coaxial electrospinning of a polymer solution surrounding the CLC Our results demonstrate the potential application for detecting acetone vapor with the advantages of com-pact dimension, high sensitivity, relatively simple and low cost.

 Preview abstract

This paper proposes a novel pulley-type surface plasmon resonator with metallic ring to generate a nano-magnetic field. The micro-ring and InGaAs waveguide on GaAs substrate were simulated by a three-dimensional numerical modeling. The positive charge is excited on the metallic microring. The propagating surface plasmon drive the charge flow by launching an optical wave to the input waveguide.

 Preview abstract

Oxidized nanoporous silicon (ONPS) thin films that were prepared by electrochemical etching of p+-Si substrates and a followed rapid-thermal-oxidation treatment exhibited largely enhanced ultra-violet (UV) photoresponses. The improved UV-sensing properties are attributed to the uniformly distributed nanoparticles embedded in the ONPS films, which are supposed to be with silicon-core/oxide-shell nano-structures.

 Preview abstract

Optical trapping is a promising technique to locate nanometer-size dielectric particles and has especially been wide used in biological research, such as Biosensing. In this paper, we present the results of simulation for combining optical trapping with circular dichroism inside the designed circular and elliptical holes under circular and linear polarized light, respectively.

 Preview abstract

This paper reports a polyetheramine-based method, which can be controlled by varying the concentration of solution for the preparation of Cu-Sn-S precursor nanoinks without a second phase for use in sulfurization. As a result, the SnS phase reacted more readily and more rapidly, resulting in the early formation of a stoichiometric CTS thin film during sulfurization.

 Preview abstract

The coupling behavior of a radiating dipole with surface plasmon polariton (SPP) resonance induced on a planar metal surface is numerically studied with an algorithm including the feedback effect of the resulting field on the source dipole to modify the emission behavior of the radiating dipole.

 Preview abstract

A novel waveguide angular sensor concept is proposed to identify the incident angle of light. FDTD simulations show that the incident angle of light can be resolved by comparing optical energy or photocurrent among all received arms. This sensor can be fabricated along the photonic circuits for optical fiber alignment.

 Preview abstract

PVA and SrFe12O19 composite films were successfully prepared in this study. The microporous PVA films were firstly deposited on aluminum foil by electrospinning. Different morphologies of PVA films were demonstrated by changing different operation parameters. Secondly, the SrFe12O19 nanoparticles were selected by sintering process for the electrospun composite films.

 Preview abstract

The electro-optic property of a nematic liquid crystal can be modified by a nanomaterial doping. We doped the barium titanate nanoparticle into 5CB liquid crystal thin cells and observed the optical property changes. Our results show that the proper concentration of nanoparticle doping is helpful in improving the operation voltage and contrast ratio.

 Preview abstract

Metamaterial, an artificial material which its structure dimension is smaller than the wavelength of incident light, has been extensively investigated in recent years. In this study, we use Rigorous Coupled-Wave Analysis to simulate the optical phenomena of asymmetric U-shape metamaterial and it shows giant optical response in near infrared region.

 Preview abstract

In this study, we demonstrate the oxygen sensing the CuO nanobridges which is fabricated by the thermal treatment. The electrical conduction behavior of CuO nanobridges shows the significant change under various oxygen concentration. The results show the potential of such 1 step fabrication CuO nanobridges be applied for gas sensing.

 Preview abstract

In this paper, we will discuss the properties of plasmonic nanoantennas with elliptical rods embedded in a two-arm grating . We will discuss the relationships of adjusted the radius of the silver grating rods r, and the dimer embedded in a one dimension two-arm grating with grating period a, and the number grating period N in seven visible wavelengths. Finally, we will show the electrical field enhancement of rods embedded in a two-arm grating plasmonic nanoantenna with elliptical .

 Preview abstract

This study fabricated a multiple poly-Si nanowires sensor through a top-down method and immobilized glucose oxidase on the multiple nanowires for determining glucose concentration. The proposed sensor is 340 nm in width and uses five physically identical and parallel nanowires. The sensor contained nanowires of various lengths (3, 5, and 10 µm).

 Preview abstract

Among methods for self-assembly of block copolymer, solvothermal annealing has been used frequently in recent years for its short reaction period. However; parameters during the assembly process were not discussed in detail. Annealing time, temperature of annealing and deswelling process are discussed here and be found greatly affect the results.

 Preview abstract

We propose a simple method to fabricate gold nanostructures for surface enhanced Raman scattering (SERS). Efficient SERS signal was observed on periodic gold-deposited-nanowires without photoresist lift-off while no SERS signal was observed on the photoresist lifted-off sample. Simulations were performed to elucidate the results.

 Preview abstract

In this report, we establish one model to estimate forward and reverse propagation in semiconductor laser with mirror, facet phase jump, and line-width enhancement factor, and the model is also combined with statistical property for long term simulation.

 Preview abstract