Plasmonic lasers exploit strong electromagnetic field confinement at dimensions well below the diffraction limit. However, lasing from an hot spot supported by discrete, coupled metal nanoparticles (NPs) has not been explicitly demonstrated to date. We present a new design for room-temperature nanolaser based on three-dimensional (3D) Au bowtie NPs organic gain material. The extreme compression, and thus ultrasmall mode volume, within gaps produced laser oscillations localized plasmon...

Significance Nanoelectronic transistor sensors based on synthesized one- and two-dimensional nanomaterials have achieved real-time label-free detection of a wide range biological species with high sensitivity, although direct analysis samples has been limited due to Debye charge screening in physiological solutions. This paper describes general strategy overcoming this challenge involving comodification the sensor surface polymer receptor, where forms permeable layer that increases effective...

Transistor-based nanoelectronic sensors are capable of label-free real-time chemical and biological detection with high sensitivity spatial resolution, although the short Debye screening length in ionic strength solutions has made difficult applications relevant to physiological conditions. Here, we describe a new general strategy overcome this challenge for field-effect transistor (FET) that involves incorporating porous biomolecule permeable polymer layer on FET sensor. This increases...

This article reports the study of infrared plasmonics with both random and periodic arrays indium-tin-oxide (ITO) nanorods (NR). A description is given on synthesis, patterning, characterization physical properties ITO NR arrays. classical scattering model, along a 3-D finite-element-method finite-difference-time-domain numerical simulation method has been used to interpret unique light phenomena. It also shown that intrinsic plasma frequency can be varied through careful postsynthesis...

This paper reports an all-moldable nanofabrication platform that can generate, from a single master, large-area nanoscale patterns with programmable densities, fill factors, and lattice symmetries. Solvent-assisted embossing (SANE) could increase the spacing of up to 100% as well decrease them down 50% in step by stretching or heating polymer substrate. Also, SANE reduce critical feature sizes small 45% compared master controlled swelling patterned molds different solvents. These...

Nanowire nanoelectronic devices have been exploited as highly sensitive subcellular resolution detectors for recording extracellular and intracellular signals from cells, well natural engineered/cyborg tissues, in this capacity open many opportunities fundamental biological research biomedical applications. Here we demonstrate the capability to take full advantage of attractive capabilities nanowire long term physiological studies by passivating elements with ultrathin metal oxide shells....

Semiconductor nanowires represent powerful building blocks for next generation bioelectronics given their attractive properties, including nanometer-scale footprint comparable to subcellular structures and bio-molecules, configurable in nonstandard device geometries readily interfaced with biological systems, high surface-to-volume ratios, fast signal responses, minimum consumption of energy. In this review article, we summarize recent progress the field nanowire a focus primarily on silicon...

Surface-enhanced Raman spectroscopy (SERS) has emerged as an ultrasensitive molecular-fingerprint-based technique for label-free biochemical analysis of biological systems. However, conventional SERS substrates, enhancement factors (EFs) strongly depend on background refractive index (RI), which prevents reliable spatiotemporal living cells consisting different extra-/intracellular organelles with a heterogeneous distribution local RI values between 1.30 and 1.60. Here, we demonstrate that...

Abstract In this study, the photothermal effect and up-conversion florescence imaging of gold nanobipyramids in liver cancer cells are investigated theoretically experimentally to explore ablation tumor therapy with higher conversion efficiency, shorter laser action time, smaller range lower power. The small-size good biocompatibility infrared absorption peak located first biological window synthesized. Femtosecond is focused on clusters die after being irradiated for 20 s at a power as low...

This study introduces a novel surface-enhanced Raman spectroscopy (SERS)-based lateral flow test (LFT) dipstick that integrates digital analysis for highly sensitive and rapid viral quantification. The SERS–LFT dipsticks, incorporating gold–silver core–shell nanoparticle probes, enable pixel-based of large-area SERS scans. Such an approach enables ultralow-level detection viruses readily distinguishes positive signals from background noise at the pixel level. developed SERS–LFTs demonstrate...

Seamless and minimally invasive integration of 3D electronic circuitry within host materials could enable the development systems that are self-monitoring allow for communication with external environments. Here, we report a general strategy preparing ordered interconnected addressable macroporous nanoelectronic networks from 2D nanowire precursors, which fabricated by conventional lithography. The have porosities larger than 99%, contain approximately hundreds devices, feature sizes 10-μm...

The application of surface-enhanced Raman spectroscopy (SERS) for everyday quantitative analysis is hindered by the point-to-point variability SERS substrates that arises due to heterogeneous distribution localized electromagnetic fields across a suite plasmonic nanostructures. Herein, we adopt elastic scattering as internal standard. Both and inelastic (i.e., Raman) are simultaneously enhanced given "hot spot", thus, signal provides intrinsic standard scales all plasmon-enhanced within...

The conventional methods of creating superhydrophobic surface-enhanced Raman spectroscopy (SERS) devices are by conformally coating a nanolayer hydrophobic materials on micro-/nanostructured plasmonic substrates. However, the may partially block hot spots and therefore compromise signals analytes. In this paper, we report partial Leidenfrost evaporation-assisted approach for ultrasensitive SERS detection low-concentration analytes in water droplets hierarchical micro-/nanostructures, which...

This paper describes three-dimensional (3D) nanohole arrays whose high optical transmission is mediated more by localized surface plasmon (LSP) excitations than polaritons (SPPs). First, LSPs on 3D hole lead to an order of magnitude higher 2D planar arrays. Second, LSP-mediated broadband and tunable SPP-enhanced transmission, which restricted Bragg coupling. Third, for the first time, two types plasmons can be selectively excited manipulated same plasmonic substrate. new substrate fabricated...

This paper reports the manipulation of surface plasmon polaritons (SPPs) in a liquid plasmonic metal by changing its physical phase. Dynamic properties were controlled solid-to-liquid phase transitions 1D Ga gratings that fabricated using simple molding process. Solid and phases found to exhibit different properties, where light coupled SPPs more efficiently We exploited supercooling characteristics access associated with over wider temperature range (up 30 °C below melting point bulk Ga)....

This paper describes a new nanofabrication method, moiré nanolithography, that can fabricate subwavelength lattices with high-rotational symmetries. By exposing elastomeric photomasks sequentially at multiple offset angles, we created arrays rotational symmetries as high 36-fold, which is three times higher than quasiperiodic (≤12-fold) and six two-dimensional periodic (≤6-fold). Because these nanopatterns be generated over wafer-scale areas, they are promising for range of photonic...

This Letter describes how out-of-plane lattice plasmon (OLP) resonances in 2D Au nanoparticle (NP) arrays show dispersive quality factors. These factors can be tailored simply by controlling NP height. Numerical calculations of near-field optical properties and band diagrams were performed to understand the measured dispersion effects OLPs. The results revealed that delocalized OLPs are a type surface Bloch mode composed many harmonics. As OLP evolves from stationary state propagating state,...