A5032194119- Mechanical and Optical Resonators
- Photonic and Optical Devices
- Advanced MEMS and NEMS Technologies
- Advanced Fiber Laser Technologies
- Force Microscopy Techniques and Applications
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Photonic Communication Systems
- Advanced Fiber Optic Sensors
- Semiconductor Lasers and Optical Devices
- Geophysics and Sensor Technology
- Photonic Crystals and Applications
- Quantum Information and Cryptography
- Nanofabrication and Lithography Techniques
- Acoustic Wave Resonator Technologies
- Optical Network Technologies
- Optical Coatings and Gratings
- Integrated Circuits and Semiconductor Failure Analysis
- Thermography and Photoacoustic Techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Neural Networks and Reservoir Computing
- thermodynamics and calorimetric analyses
- Semiconductor materials and devices
- Topological Materials and Phenomena
- Superconducting and THz Device Technology
- Experimental and Theoretical Physics Studies
Physical Sciences (United States)
2018-2024
University of Maryland, College Park
2018-2024
Center for Nanoscale Science and Technology
2014-2018
National Institute of Standards and Technology
2014-2018
University of Bristol
2018
DEVCOM Army Research Laboratory
2017
National Institute of Standards
2016
Harvey Mudd College
2016
University of California, Berkeley
2010-2015
The act of position measurement alters the motion an object being measured. This quantum backaction is typically much smaller than thermal a room-temperature and thus difficult to observe. By shining laser light through nanomechanical beam, we measure beam's thermally driven vibrations perturb its with optical force fluctuations at level dictated by Heisenberg measurement-disturbance uncertainty relation. We demonstrate cross-correlation technique distinguish optically from motion, observing...
This article introduces in archival form the Nanolithography Toolbox, a platform-independent software package for scripted lithography pattern layout generation.The Center Nanoscale Science and Technology (CNST) at National Institute of Standards (NIST) developed Toolbox to help users CNST NanoFab design devices with complex curves aggressive critical dimensions.Using parameterized shapes as building blocks, allows rapidly nanoscale arbitrary complexity through scripting programming.The...
Cavity optomechanical systems are being studied for their potential in areas such as metrology, communications, and quantum information science. For a number of recently proposed applications which multiple optical mechanical modes interact, an outstanding challenge is to develop multimode architectures that allow flexibility the sub-system designs while maintaining strong interactions have been demonstrated single-mode systems. To end, we demonstrate slot-mode crystals, devices photonic...
Abstract Optical-fiber-based, hollow-core waveguides (HCWs) have opened up many new applications in laser surgery, gas sensors, and non-linear optics. Chip-scale HCWs are desirable because they compact, light-weight can be integrated with other devices into systems-on-a-chip. However, their progress has been hindered by the lack of a low loss waveguide architecture. Here, completely waveguiding concept is demonstrated using two planar, parallel, silicon-on-insulator wafers high-contrast...
The property of self-imaging combined with the polarization birefringence angled multimode waveguide is used to design a silicon nitride (SiN) splitter (PS) at λ ∼ 1550 nm. demonstrated PS on 450 nm thick SiN device layer (with 2.5 µm cladding oxide) has footprint 80 µm×13 and exhibits nearly wavelength independent performance over C+L bands. Also, can be configured as combiner (PC) in reverse direction similar bandwidth performance. measured crosstalk (CT) insertion loss (IL) are...
We measured the optical transmission through an SU-8 microring resonator inside a cryostat and analyzed shift of resonant wavelengths to determine thermo-optic behavior around wavelength 1600 nm. As temperature was decreased from room (RT) 3K, refractive index crosslinked increase 1.571 1.584, while coefficient by two orders magnitude.
The development of Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> N xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> nanobeam optomechanical crystals is reviewed. These structures consist a 350-nm thick, 700-nm wide doubly-clamped that periodically patterned with an array air holes to which defect region introduced. periodic patterning simultaneously creates photonic bandgap for 980 nm band photons and phononic 4 GHz phonons, the...
A self-sustained Radiation-Pressure driven MEMS ring OptoMechanical Oscillator (RP-OMO) attaining an anchor-loss-limited mechanical Q-factor of 10,400 in vacuum has posted a best-to-date phase noise -102 dBc/Hz at 1 kHz offset from 74 MHz carrier, more than 15 dB better the best previously published mark [1]. While enhanced optical and Q both serve to lower threshold power required obtain oscillation, it is that ends up having strongest impact on [2], much as traditional MEMS-based...
We demonstrate low-loss ( < 1 dB), broadband (BW ∼ 100 nm near λ 1550 nm) and polarization-independent fiber-to-chip couplers using 3D nano-printed polymer structures on Si 3 N 4 -on-SiO 2 platform.
Photothermal induced resonance (PTIR), also known as atomic force microscopy-infrared (AFM-IR), enables nanoscale IR absorption spectroscopy by transducing the local photothermal expansion and contraction of a sample with tip an microscope. PTIR spectra enable material identification at can measure composition depths >1 μm. However, implementation quantitative, multivariate, analysis requires improved understanding signal transduction intensity dependence on characteristics measurement...
By shining laser light through a nanomechanical beam, we measure the beam's thermally driven vibrations and perturb its motion with optical forces at level dictated by Heisenberg measurement-disturbance uncertainty relation. Such quantum backaction is typically difficult to observe room temperature where intensity fluctuations many orders of magnitude smaller than thermal motion. We demonstrate cross-correlation technique distinguish optically from motion, observing this signature up...
A Radiation Pressure driven Optomechanical Oscillator (RP-OMO) comprised of attached concentric rings polysilicon and silicon nitride has achieved a first demonstration mixed material optomechanical device, posting mechanical Q <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</sub> 22,300 at 52 MHz, which is more than 2× larger previous single-material devices [1]. With this , the RP-OMO exhibits best-to-date phase noise -125 dBc/Hz 5 kHz...
Nanobeam optomechanical crystals, in which localized GHz frequency mechanical modes are coupled to wavelength-scale optical modes, being employed a variety of experiments across different material platforms. Here, we demonstrate the electrostatic tuning and stabilization such devices, by integrating Si3N4 slot-mode crystal cavity with nanoelectromechanical systems element, controls displacement an additional “tuning” beam within near-field cavity. Under DC operation, wavelength several...
We present a MEMS-actuated tunable-bandwidth filter implemented in phosphosilicate glass (PSG). Tuning range is 0.8 to 8.5GHz. Based on performance of our stand-alone PSG resonator, minimum bandwidth can be as low 30MHz.
A super-regenerative optical receiver detecting on-off key (OOK) modulated light inputs has been demonstrated that harnesses the radiation-pressure gain of a self-sustained electro-opto-mechanical oscillator (EOMO) to render its oscillation amplitude function intensity coupled into oscillator. Unlike previous electronic receivers, this rendition removes need periodically quench signal, which then simplifies architecture and increases attainable receive bit rate. fully functional with compact...
A novel hollow-core waveguide using high-contrast sub-wavelength grating (HCG) is experimentally demonstrated for the first time. The formed by two HCG planar structures and shows both transverse lateral light confinement.
This paper demonstrates a passive, integrated electro-optic receiver for detection of free-space microwave radiation. Unlike traditional receiver, which relies on conductive antennas and electrical amplifiers, this uses only optically probed elements with no electrodes or electronic components. The employs two co-resonant structures: dielectric resonator antenna (DRA) to concentrate incoming radiation an aluminum nitride (AlN) racetrack resonantly enhance the optical carrier. field DRA...
We designed and demonstrated 3D polymer coupler structures to adiabatically couple light into waveguides. measured a coupling loss of 2.1 dB per facet around 1550 nm.
We present a new phosphosilicate glass photonic integrated circuit platform for optomechanical systems. Wafer-scale reflow enables high-Q (1.5×106) resonators and closely-spaced (250nm) waveguides. Optomechanical resonance (71.9MHz) is demonstrated.
We discuss some potential benefits of using integrated RF-photonic devices/circuits in a phased-array-Radar system. A viable and simple solution is proposed for low-cost, multi-beams beamformer that meets both transmitting receiving RF-system specifications/requirements. Proof-of-concept experiments chip-scale integrated-photonics subsystem development will also be discussed.