A5003393736- Plasmonic and Surface Plasmon Research
- Optical Coatings and Gratings
- Gold and Silver Nanoparticles Synthesis and Applications
- Photonic and Optical Devices
- Photonic Crystals and Applications
- Semiconductor Quantum Structures and Devices
- Mechanical and Optical Resonators
- Advanced Semiconductor Detectors and Materials
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Near-Field Optical Microscopy
- Carbon Nanotubes in Composites
- Experimental Learning in Engineering
- Nanowire Synthesis and Applications
- Metamaterials and Metasurfaces Applications
- Gas Sensing Nanomaterials and Sensors
- Strong Light-Matter Interactions
- Advanced Sensor and Energy Harvesting Materials
- Microwave Engineering and Waveguides
- Advanced Optical Sensing Technologies
- Terahertz technology and applications
- Infrared Target Detection Methodologies
- Advanced Image Fusion Techniques
- Photoacoustic and Ultrasonic Imaging
- Laser-Ablation Synthesis of Nanoparticles
Stonehill College
2015-2024
University of Massachusetts Lowell
2010-2015
University of Massachusetts Boston
2009
In this paper, we report a quantum dot infrared photodetector (QDIP) enhanced by backside-configured surface plasmonic structure with an over 40 times peak photocurrent enhancement. The QDIP enhancement the is compared that top-configured structure. shows much higher and photodetectivity D* We analyze excitation of waves structures. attributed to more efficient
In this letter, we report a quantum dot photodetector enhanced by Fano-type interference in metallic two-dimensional (2D) subwavelength hole array (2DSHA). The photocurrent enhancement wavelength shows an offset from the plasmonic resonant peak and corresponds to dip transmission spectrum of 2DSHA structure. is attributed asymmetric line shapes resonance are analyzed agree well with two-peak model. Over 100% photodetectivity photoresponsivity achieved at Fano first order mode.
In this paper, we analyse surface plasmonic resonance (SPR) induced near-field electric-field vector distribution in the quantum dot (QD) region and determine their roles infrared photodetector (QDIP) enhancement. SPR can be excited metallic two-dimensional subwavelength hole arrays (2DSHAs) when illuminated at resonant wavelengths. The vectors (Ez, Ex Ey) distributions overlaps with QD active are simulated. A long-wave (LWIR) QDIP is fabricated 2DSHA structure to experimentally measure...
Abstract In this paper, we measured the transmission of 2DSHA surface plasmonic structures and its variation with hole diameters a structures. The relationship between is found to be different from prediction Bethe's diffraction theorem. We also that photocurrent quantum dot (QD) infrared photodetectors (QDIPs) QD active layer thicknesses show dependence on QDIPs 10 layers (10-QDIPs) saturates starts decrease as diameter larger than 1.6 µ m, whereas 20 (20-QDIPs) increases linearly diameter....
In this paper, we analyze near-field vector components of a metallic circular disk array (MCDA) plasmonic optical antenna and their contribution to quantum dot infrared photodetector (QDIP) enhancement. The the MCDA distribution in QD active region are simulated. overlap integral with is calculated at different wavelengths compared QDIP enhancement spectrum. x-component (E(x)) shows larger intensity stronger correlation than E(z) thus determined be major component
In this paper, we report a frequency-modulated (FM) passive wireless sensor tag for ammonia (NH <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> ) sensing. The consists of single-walled carbon nanotube (SWCNT) network based NH sensor, radio frequency antenna, ring oscillator, and other supporting circuits. SWCNT network-based is fabricated on flexible plastic substrate through printable processes. SWCNT-based shows an enhanced sensitivity...
In this paper, we report a full-wavelength plasmonic dipole optical antenna coupled quantum dot infrared photodetector (QDIP). The can effectively modify the EM wave distribution and convert free-space propagation light to localized surface resonance (SPR) within nanometer (nm) gap region of antenna. QDIP shows incident-angle-dependent photocurrent enhancement. angular dependence follows far-field pattern directivity is measured be 1.8 dB, which agrees well with simulation. To our best...
Highly sensitive infrared photodetectors are needed in numerous sensing and imaging applications. In this paper, we report on extended short-wave (e-SWIR) avalanche photodiodes (APDs) capable of operating at room temperature (RT). To extend the detection wavelength, e-SWIR APD utilizes a higher indium (In) composition, specifically In0.3Ga0.7As0.25Sb0.75/GaSb heterostructures. The cut-off wavelength is successfully to 2.6 µm RT, as verified by Fourier Transform Infrared Spectrometer (FTIR)...
In this paper, we report a surface plasmonic enhanced polarimetric longwave infrared (LWIR) photodetector. Polarization-selective detection of LWIR incidence with different polarizations is achieved at resonant modes. Band-pass spectral filtering also provided the modes by enhancement. The extinction ratio (ER) and its limiting factor discussed.
In this paper, we investigate the conductance of single walled carbon nanotube (SWCNT) networks at different humidity levels and various device temperatures. The carrier transport processes are analyzed by performing a temperature-dependent study. It is found that SWCNT dominated thermal activation hopping over barriers between CNTs. average separation SWCNTs to vary linearly with levels. humidity-dependent network modeled compared experimental data. model agrees well
In this paper, we analyze quantum selection rules of intersubband transitions in dots (QDs) and determine their impact on plasmonic enhancement dot infrared photodetectors (QDIPs). Photoluminescence photocurrent spectrum measurement were performed QD samples with different doping levels to identify the energy associate photodetection peaks transitions. The are determined by electric-dipole interaction. To enhancement, fabricated metallic two-dimensional subwavelength hole array (2DSHA)...
In this paper, we report a quantum dot infrared photodetector (QDIP) embedded in plasmonic perfect absorber (PPA) cavity designed at the resonant wavelength of 8.2 µm. The reflection spectra and electric-field are simulated found to have strong confinement wavelength. QDIP PPA was fabricated using our flip-chip bonding fan-out reading based fabrication process. Strong photocurrent enhancement is observed Due enhancement, high efficiency (QE) 50% achieved. QE demonstration indicates that...
In this paper, we report the analysis of a concentric circular ring plasmonic optical antenna (POA) array using simple lumped coupled circuit (LCC) model. The currents in rings POA and their mutual couplings are analyzed LCC results agree well with numerical simulation CST's Microwave Studio®. model reveals between rings. It is found that not only adjacent rings, but also involve second (2nd) nearest or farther neighbors. Since near-fields antennas related to antennas, provides useful tool...
In this paper, we report a mid-wave infrared (MWIR) and long-wave (LWIR) dual-band photodetector capable of voltage-controllable detection band selection. The voltage-tunable is based on the multiple stacks sub-monolayer (SML) quantum dots (QDs) self-assembled QDs. By changing bias voltages, one can set to be MWIR, or LWIR both with high photodetectivity low crosstalk between bands.
We report an all-printed thin-film transistor (TFT) on a polyimide substrate with linear transconductance response. The TFT is based our purified single-walled carbon nanotube (SWCNT) solution that primarily consists of semiconducting nanotubes (CNTs) low metal impurities. exhibits high ON/OFF ratio around 10 3 and bias-independent over certain gate bias range. Such property different from conventional metal-oxide-semiconductor field-effect transistors (MOSFETs) due to the special band...
In this paper, ultra-wideband RF/Microwave components fabricated using a low-cost aerosol-jet printing technology are demonstrated on 50 μm thick Kapton film. The include four-stage Wilkinson power divider and novel planar quad Archimedean spiral true-time delay line. printed has achieved bandwidth of 2 to 20 GHz with typical dB insertion loss, greater than 25 return better isolation performance across the majority band. line ns true time excellent flatness entire performances comparable...
The Surface Plasmonic Resonances (SPRs) excited by two complementary structures, 2 dimensional metallic disc array (2DMDA) and subwavlength hole (2DSHA), are simulated analyzed. 2DMDA 2DSHA enhancement on quantum dot infrared photodetectors (QDIPs) also evaluated compared. give a large peak photocurrent about 40 times, whereas the provide 10 times with broad band enhancement. cause of difference in is It's indicated that QDIP depends interaction plasmonic fields dots (QDs). Based...
In this paper, we analyze the plasmonic resonance excited by linearly polarized longwave infrared (LWIR) plane waves in a metallic circular disk optical antenna (MCDA). The surface current distributions are simulated at different wavelengths, incident angles, and polarizations. (SPRs) from Bessel-type of SPR modes closely resemble those monopole antenna. An MCDA coupled LWIR quantum dot photodetector (QDIP) was fabricated measured wave wavelengths angles. A linear correlation between...
In this paper, we obtain mid-wave infrared (MWIR), long-wave (LWIR), and MWIR/LWIR dual-band images from a voltage tunable quantum dot focal plane array. The image system allows collection of information both bands thus enables on-chip fusion at the sensor with self-registered bands. We compare off-chip-fused MWIR LWIR using standard methods. shows much clearer features due to self-registration in collection. mutual (Q <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
A modular laboratory curriculum with exercises for students and lesson plans teachers is presented. Fundamentals of basic integrated photonic (IP) devices can be taught, first as a lecture-in-the-lab followed by "hands-on" measurements. This comprehensive utilizes data collected from the "AIM Photonics Institute PIC education chip" that was designed specifically purpose education, fabricated at AIM SUNY Poly. Training using this will performed through Academy network in New York (NY)...
In this paper, we report a back side configured pointed dipole optical antenna array enhanced quantum dot infrared photodetector (QDIP). configuration, the light illumination is from substrate (i.e. illumination), goes through QDIP and then reaches array. The near-field electric fields (E-fields) are simulated for both top illuminations. gives stronger E-fields than configuration. physical mechanism difference analyzed. A longwave with was fabricated tested. measurements agree well...
We report an all-printed flexible carbon nanotube (CNT) thin-film transistor (TFT). All the CNT TFT components, including source and drain electrodes, transport channel, gate electrode, are printed on a substrate at room temperature. A high ON/OFF ratio of over 10<sup>3</sup> was achieved. The all CNT-TFT also exhibits bias-invariant transconductance certain bias range. This process avoids conventional procedures in lithography, vacuum, metallization, offers promising technology for...
We report a sub-wavelength transmission surface grating (TSG) enhanced longwave infrared (LWIR) quantum dot photodetector. Broadband photocurrent enhancement covering the wavelength range from 4 μm to 11 is observed. A 4.6 times (4.6×) obtained at photodetection of 8.7 μm. By comparing simulated diffraction efficiency with spectrum, we attribute 1st-order normal (IR) incidence radiation. The photodetectivity (D*) different biases also measured and analyzed.