In this paper, we present a network simulator, Aqua-Sim, for underwater sensor networks. Aqua-Sim is based on NS-2, one of the most widely used simulators, and it follows object-oriented design style all entities are implemented as classes. effectively simulates attenuation acoustic channels collision behaviors in long delay Moreover, supports three-dimensional deployment provides rich set basic advanced protocols. Through several case studies, show that can "reproduce" real world with high...

In this paper, unique surface sensing property and enhanced sensitivity in microring resonator biosensors based on subwavelength grating (SWG) waveguides are studied demonstrated. The SWG structure consists of periodic silicon pillars the propagation direction with a period. Effective region includes not only top side waveguide, but also space between light path. It leads to greatly increased contrast common evanescent wave sensors: remains constantly high as layer thickness grows. Microring...

Compared to the conventional strip waveguide microring resonators, subwavelength grating (SWG) resonators have better sensitivity and lower detection limit due enhanced photon-analyte interaction. As sensors, especially biosensors, are usually used in absorptive ambient environment, it is very challenging further improve of SWG ring resonator by simply increasing sensitivity. The high resulted from larger mode-analyte overlap also brings significant absorption loss, which deteriorates...

The success of multicarrier modulation in the form OFDM radio channels illuminates a path one could take towards high-rate underwater acoustic communications, and recently there are intensive investigations on OFDM. In this paper, we implement transmitter receiver design [4,5] TMS320C6713 DSP board. We analyze workload identify most time-consuming operations. Based analysis, tune algorithms optimize code to substantially reduce synchronization time 0.2 seconds processing block 1.7 processor...

A method for the dense integration of high sensitivity photonic crystal (PC) waveguide based biosensors is proposed and experimentally demonstrated on a silicon platform. By connecting an additional PC filter to microcavity sensor in series, transmission passband created, containing resonances sensing purpose. With proper engineering passband, multiple sensors can be integrated into microarrays interrogated simultaneously between single input output port. The concept was with 2-channel L55...

In an on-chip silicon-organic hybrid electro-optic (EO) modulator, the mode overlap with EO materials, in-device effective r33, and propagation loss are among most critical factors that determine performance of modulator. Various waveguide structures have been proposed to optimize these factors, yet there is a lack comprehensive consideration on all them. this Letter, one-dimensional (1D) photonic crystal (PC) slot structure takes into consideration. The advantage strong confinement within...

Abstract Silicon‐organic hybrid integrated devices show great potential in high‐speed optical interconnects and sensors. In this paper, a modulator based on an electro‐optic (EO) polymer (SEO125) infiltrated sub‐wavelength grating (SWG) waveguide ring resonator is presented. The core of the SWG consists periodically arranged silicon pillars along light propagation direction, which provides large mode volume overlap with EO polymer. optimized shows 36.2% duty cycle 0.7. 3‐dB modulation...

Significant progress has been made recently on the use of multicarrier modulation in form orthogonal frequency division multiplexing (OFDM) for high data rate underwater acoustic communications. In this paper, we present implementation results OFDM modems under both single-input single-output and multi-input multi-output (two transmitters two receivers) settings. The rates are 3.2 kb/s 6.4 SISO MIMO systems, respectively, with QPSK modulation, rate-1/2 channel coding, signal bandwidth 6 kHz....

In this paper, we experimentally demonstrate a highly sensitive on-chip photonic electromagnetic wave sensor operating at 14.1 GHz with 3 dB bandwidth of 4.84 GHz. The demonstrated has several important advantages over conventional electrical sensors, including high sensitivity, compact in size, and strong immunity to interference. is comprised bowtie antenna an asymmetric Mach–Zehnder interferometer (MZI). One arm the MZI electro-optic polymer infiltrated one-dimensional slot crystal...

We provide an experimental demonstration of mid-infrared polarization rotators built on a silicon-on-sapphire platform at the wavelength 4.55 μm to enable integration quantum cascade lasers (QCLs) and detectors with slotted photonic crystal waveguide (PCW) gas sensors for on-chip optical spectroscopy applications. The are essential convert preferentially transverse magnetic (TM) polarized light from QCL electric (TE) interface preferential TE-guiding PCW sensors. rotator consists...

Defect-engineered photonic crystal (PC) microcavities were fabricated by UV photolithography and their corresponding sensitivities to biomarkers in patient plasma samples compared for different resonant microcavity characteristics of quality factor Q biomarker fill fraction. Three from pancreatic cancer patients experimentally detected conventional L13 defect-engineered without nanoholes higher sensitivity PC with nanoholes. 8.8 femto-molar (0.334 pg/mL) concentration was which are 50 times...

The adoption of green chemistry protocols in nanoparticle (NP) synthesis has exhibited substantial potential and is presently a central focus research for generating versatile NPs applicable across broad spectrum applications. In this scientific contribution, we, the first time, examined ability Aconitum Laeve (A. Laeve) crude extract to synthesize silver gold nanoparticles (AgNPs@AL; AuNP@AL) explored their applications biological activities catalytic degradation environmental pollutants....

Traditional silicon waveguides are defined by waveguide trenches on either side of the high-index core that leads to fluid leakage orifices for over-layed microfluidic channels. Closing needs additional fabrication steps which may include oxide deposition and planarization. We experimentally demonstrated a new type channel design with ultralow-loss crossings (0.00248 dB per crossings). The all other on-chip passive-waveguide components fabricated in one step no planarization eliminates any...

The slow light sensor techniques have been applied to bio-related detection in the past decades. However, similar testing-systems are too large carry a remote area for diagnosis or point-of-care testing. This study demonstrated fully automatic portable biosensing system based on microring resonator. An optical-fiber array mounted controller micro-positioning system, which can be interfaced with MATLAB locate tentative position source and waveguide coupling alignment. Chip adapter...

Photonic crystal (PC) microcavities formed by 2-D air holes on silicon-on-insulator substrates were utilized as biosensors to detect antibiotics with high specificity. The antibiotic, gentamicin, molecular weight of only 478 g/mol, was successfully detected via its binding corresponding antibody pre-immobilized the sensor surface. Detection range (in concentration) extended combining different types PC a single silicon chip, covering from 0.1 nM 1 μM . Specificity detection also verified...

We propose a coupled-tolerant subwavelength photonic racetrack resonator (PRR) on the silicon-on-insulator (SOI) platform, in which grating (SWG) PRR is coupled to symmetrical SWG bus waveguide. The material equivalent refractive index can be manipulated by characteristic and thus an additional fabrication degree of freedom achieved. resonant characteristics improved significantly controlling pillar size increasing interaction length between waveguide (RBW). simulation results show that has...

We design, fabricate, and experimentally demonstrate a compact thermo-optic gate switch comprising 3.78 um-long coupled L0-type photonic crystalmicrocavities on silicon-on-insulator substrate. A nanohole is inserted in the center of each individual L0 crystalmicrocavity. Coupling between identical microcavities gives rise to bonding anti-bonding states molecules. The are numerically simulated verified with 6 nm-wide flat-bottom resonance its transmission spectrum, which enables wider...

Subwavelength grating metamaterial racetrack ring resonator (SGMRTR) increases the coupling strength between bus waveguide and thus better extinction ratio can be achieved. In this paper, we summarized our recent work on SGMRTRs. We show that with improved ratio, intrinsic detection limit of refractive index sensors pushed closer to theoretical limit. have also demonstrated first high-speed optical modulator based electro-optic polymer infiltrated subwavelength measured 3-dB bandwidth 41.4...

Elliptic Curve Cryptography (ECC) provides a similar level of security to conventional integer-based public-key algorithms, but with much shorter keys. ECC over binary field is special interest because the operations in are thought more space and time efficient. However, software implementations still slow, especially on low-end processors that used small computing devices such as sensor nodes. In this paper, we study different word sizes. With set algorithms identified, can perform 163-bit...

Summary The ATP ‐dependent Lon protease is involved in many physiological processes. In bacteria, regulates pathogenesis and, yeast, protects mitochondia from oxidative damage. However, little known about fungal phytopathogens. MAP1 , a homologue of M agnaporthe oryzae was recently identified to be important for stress resistance and pathogenesis. Here, we focus on novel pathogenic pathway mediated by . Based an interaction system between rice tandem affinity purification ( TAP )‐tagged...