A5001737064- Photonic and Optical Devices
- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Optic Sensors
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic Crystals and Applications
- Analytical Chemistry and Sensors
- Force Microscopy Techniques and Applications
- Spectroscopy and Laser Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Optical Coatings and Gratings
- Semiconductor Quantum Structures and Devices
- Advanced Chemical Sensor Technologies
- Silicon Nanostructures and Photoluminescence
- Advanced Fluorescence Microscopy Techniques
- Nanowire Synthesis and Applications
- Quantum Information and Cryptography
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Cold Atom Physics and Bose-Einstein Condensates
- Gas Sensing Nanomaterials and Sensors
- Molecular Junctions and Nanostructures
United States Naval Research Laboratory
2016-2025
Optical Sciences (United States)
2006-2025
United States Navy
2024
Naval Research Laboratory Optical Sciences Division
2006-2019
K Lab (United States)
2007-2015
University of Tulsa
2012
Société Française d'Allergologie
2008
University of Maryland, College Park
2001-2006
Sensors (United States)
2003-2006
Physical Sciences (United States)
2002-2006
Compact silicon-on-insulator (SOI) waveguide thermo-optically tunable Fabry-Perot microcavities with silicon/air Bragg mirrors are demonstrated. Quality factors of Q=4,584 measured finesse F=82. Tuning is achieved by flowing current directly through the silicon cavity resulting in efficient thermo-optic tuning over 2 nm for less than 50 mW applied electrical power. The high-Q cavities enable fast switching (1.9 mus rise time) at low drive power (<10 mW). By overdriving device, times 640 ns...
Weak scattering and short optical interaction lengths have, until this work, prevented the observation of trace gas Raman spectra using photonic integrated circuitry. spectroscopy is a powerful analytical tool, its implementation chip-scale waveguide devices represents critical step toward detection identification in small handheld systems. Here, we report first measurements gases nanophotonic waveguides. These were made possible highly evanescent rib waveguides functionalized with thin...
We demonstrate in-plane microfabricated Fabry-Perot cavities with cryogenically etched silicon/air distributed Bragg reflector (DBR) mirrors and integrated silicon-on-insulator rib waveguides. Several DBR configurations cavity lengths were measured. Various devices exhibit Q=26963, FWHM=0.060 nm, finesse F=489, free spectral range FSR=81.7 mirror reflectance R=99.4%. Thermo-optic tuning over 6.7 nm is also demonstrated.
We report the measurement of waveguide-enhanced Raman spectra from trace concentrations four vapor-phase chemical warfare agent simulants: dimethyl methylphosphonate, diethyl trimethyl phosphate, and triethyl phosphate. The are obtained using highly evanescent nanophotonic silicon nitride waveguides coated with a naturally reversible hyperbranched carbosilane sorbent polymer exhibit extrapolated one-σ detection limits as low 5 ppb. use finite-element model to explain polarization wavelength...
We develop a set of laser rate equations that accurately describes mechanical amplification in optomechanical oscillators driven by photothermal or radiation pressure forces. In the process we introduce parameters describing gain, stored energy, slope efficiency, and saturation power laser. identify three-phonon parametric interactions as microscopic mechanism enabling self-oscillation. Our theory shows remarkable agreement with our experimental data, demonstrating self-oscillation is...
We detect trace gases at parts-per-billion levels using evanescent-field absorption spectroscopy in silicon nitride microring resonators coated with a functionalized sorbent polymer. An analysis of the resonance line shapes enables measurement differential spectra for number vapor-phase analytes. The are obtained near-infrared overtone OH-stretch resonance, which provides information about toxicity analyte vapor.
Photonic integrated circuits have enabled progressively active functionality in compact devices with the potential for large-scale integration. To date lowest loss photonic are achieved silica or silicon nitride-based platforms. However, these materials generally lack reconfigurability. In this work we present a platform achieving any dielectric waveguide via opto-electro-mechanical tuning of effective refractive index (Δneff≈0.01-0.1) and phase (Δϕ>2π). A suspended microbridge weakly...
Waveguide-enhanced Raman spectroscopy (WERS) is an analytical technique frequently employed for chemical and biological sensing. Operation at visible wavelengths to harness the inverse fourth power with excitation wavelength signal scaling of scattering intensity desirable, combat inherent inefficiency spectroscopy. Until now, WERS demonstrations in have required custom materials fabrication, resulting high losses low yields. In this work, we demonstrate a silicon nitride (SIN) platform...
Light sources monolithically integrated with optical filters, modulators, and detectors are necessary components for photonic systems on a chip. For broadband applications such as chemical or biological sensing using absorption spectroscopy, white light preferred over lasers amplified spontaneous emission sources. In particular, thermal offer straightforward means emission. However, to date, there have been few reports of waveguide-coupled this work, we demonstrate suspended nanophotonic...
The development of efficient low-loss electro-optic and nonlinear components based on silicon or its related compounds, such as nitrides oxides, is expected to dramatically enhance photonics by eliminating the need for non-CMOS-compatible materials. While bulk Si centrosymmetric thus displays no second-order (\c{hi}(2)) effects, a body experimental evidence accumulated in last decade demonstrates that when strain gradient present, significant \c{hi}(2) Pockels coefficient can be observed. In...
The precise quantification of a dielectric waveguide core thickness, width, refractive index, and cladding index across wafer is critical for greater consistency accuracy in photonic circuit fabrication. However, accurate wafer-scale measurements these parameters have not yet been demonstrated. We previously described method extracting four simultaneously from silicon nitride waveguides using unbalanced Mach–Zehnder interferometers on single die. In this work, we show that technique can be...
A cryogenic etch process using low temperature (T⩽−100°C) and SF6 O2 gases is presented for fabricating high aspect ratio silicon microstructures, including photonic devices micro- nanoelectromechanical systems. The requires only a single electron beam resist mask results in open area rates of 4μm∕min. Various parameters, flow, rf forward power, substrate temperature, chamber pressure were studied, the resulting effect on quality was evaluated terms sidewall verticality surface roughness....
We demonstrate electrostatically actuated end-coupled optical waveguide devices in the indium phosphide (InP) material system. The design of a suitable layer structure and fabrication process for InP-based micro-electro-mechanical systems (MEMS) is reviewed. Critical issues design, such as coupling losses, are discussed their effect on device performance evaluated. Several demonstrated, including 1 × 2 switches resonant sensors with integrated readout. exhibit low-voltage operation (<7 V),...
We have assembled and characterized a multimode optoelectronic oscillator with integrated optical filter for detecting low-power radio-frequency (RF) signals. The system can selectively amplify RF signals from 1 to 6 GHz. input be as low - 83 dBm compression dynamic range of 72 dB. Using an silicon facilitates channelization the amplified signal 3 GHz by reducing gain above Future improvements are discussed.
Cavity opto-mechanics exploits optical forces acting on mechanical structures. Many demonstrations either require extensive alignment of components for probing and measurement, which limits the number opto-mechanical devices on-chip; or approaches limit ability to control parameters independently. In this work, we propose an architecture incorporating a waveguide-DBR microcavity coupled in-plane micro-bridge resonator, enabling large-scale integration on-chip with individually tune designs....
We experimentally demonstrate mid-infrared difference-frequency generation in suspended 181 nm thick GaAs waveguides. Generation of the idler at wavelengths between 2800 and 3150 is enabled by form-birefringent phase-matching ultrahigh index-contrast Nonlinear mixing has a measured efficiency 0.4 W⁻¹ 1.2 mm long waveguide using CW signal tunable 1490 1620 pump 1018 1032 powers few mW.
An optical waveguide MEMS switch fabricated on an indium phosphide (InP) substrate for operation at 1550 nm wavelength is presented. Compared to other switches, which typically use relatively large mirrors or long end-coupled waveguides, our device uses a parallel switching mechanism. The utilizes evanescent coupling between two closely-spaced waveguides side by side. Coupling controlled changing the gap and length via electrostatic pull-in. This enables both variable voltages below 10 V....
We present a novel waveguide design for InP microelecromechanical systems. The substrate is removed from underneath the by sacrificial etching, and suspended supported lateral tethers. This allows segments of to be moved prevents leakage loss in fixed waveguides. A single-mask fabrication process developed that can extended more complex devices employing electrostatic actuation. Fabricated waveguides exhibit 2.2 dB/cm tether pairs 0.25-dB additional loss.
A silicon-on-insulator in-plane microelectromechanical resonator coupled to a high-Q (Q≈4,200), high finesse (FMax=265) optical Fabry–Pérot microcavity is presented. The cavity utilizes reflectance dry-etched silicon/air distributed Bragg reflectors. By suspending one of the mirrors microbridge resonator, mirror can be displaced and tuned. Using electrostatic actuation, bidirectional tuning from −12.1to+17.0nm (29.1nm total range) demonstrated near 1601nm wavelength. device also enables...
Many components for free space optical communication systems have shrunken in size over the last decade. However, steering remained large and power hungry. Non-mechanical beam offers a path to reducing of these systems. Optical phased arrays can allow integrated elements. One most important aspects an array technology is its scalability number Silicon photonics potentially offer this using CMOS foundry techniques. In paper small-scale silicon photonic demonstrated both transmitter receiver...