A5088412690- Neuroscience and Neural Engineering
- Advanced Memory and Neural Computing
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Terahertz technology and applications
- EEG and Brain-Computer Interfaces
- Gold and Silver Nanoparticles Synthesis and Applications
- Photoreceptor and optogenetics research
- Photonic and Optical Devices
- Neural dynamics and brain function
- Quantum optics and atomic interactions
- Spectroscopy and Laser Applications
- Mechanical and Optical Resonators
- Spectroscopy and Quantum Chemical Studies
- Diamond and Carbon-based Materials Research
- Conducting polymers and applications
- Photosynthetic Processes and Mechanisms
- Advanced biosensing and bioanalysis techniques
- Ion-surface interactions and analysis
- Advanced Electron Microscopy Techniques and Applications
- Photonic Crystals and Applications
- Nonlinear Optical Materials Studies
- Quantum Information and Cryptography
- Mass Spectrometry Techniques and Applications
- Magnetic properties of thin films
Stanford University
2020-2025
SLAC National Accelerator Laboratory
2020-2024
Massachusetts Institute of Technology
2018-2020
Menlo School
2020
Abstract The ability to shape photon emission facilitates strong photon-mediated interactions between disparate physical systems, thereby enabling applications in quantum information processing, simulation and communication. Spectral control solid state platforms such as color centers, rare earth ions, dots is particularly attractive for realizing on-chip. Here we propose the use of frequency-modulated optical transitions spectral engineering single emission. Using a scattering-matrix...
Ultrafast light-matter interactions lead to optical-field-driven photocurrents with an attosecond-level temporal response. These can be used detect the carrier-envelope-phase (CEP) of short optical pulses, and could utilized create optical-frequency, petahertz (PHz) electronics for information processing. Despite recent reports on in various nanoscale solid-state materials, little has been done examining large-scale integration these devices. In this work, we demonstrate enhanced, on-chip...
To restore and augment complex functions such as vision, electrical neural interfaces require the ability to selectively activate neurons at cellular resolution, a challenge given limited electrode density of typical interfaces. Current steering - passing current through multiple electrodes simultaneously target locations between could enhance but is intractable if all stimulation patterns must be tested exhaustively. Here, we develop experimentally validate framework for scalable...
We present an experimental demonstration of ultrafast electron diffraction (UED) with THz-driven bunch compression and time-stamping that enables UED probes improved temporal resolution. Through longitudinal compression, a factor approximately four is achieved. Moreover, the time-of-arrival jitter between compressed pump laser pulse suppressed by three. Simultaneously, THz interaction imparts transverse spatiotemporal correlation on distribution, which we utilize to further enhance precision...
Visualizing ultrafast dynamics at the atomic scale requires time-resolved characterization with femtosecond temporal resolution. For fully relativistic electron bunch probes, existing techniques for single-shot diffraction (UED) are limited by achievable probe length, charge, and timing jitter. We present first experimental demonstration of dual-fed THz-driven compression time-stamping that enables probes improved This technique utilizes two counter-propagating quasi-single-cycle THz pulses...
Abstract Silicon‐based microelectronics can scalably record and modulate neural activity at high spatiotemporal resolution, but their planar form factor poses challenges in targeting 3D structures. A method for fabricating tissue‐penetrating microelectrodes directly onto using high‐resolution printing via 2‐photon polymerization scalable microfabrication technologies are presented. This approach enables customizable electrode shape, height, positioning precise of neuron populations...
Abstract Objective. Neural interfaces are designed to evoke specific patterns of electrical activity in populations neurons by stimulating with many electrodes. However, currents passed simultaneously through multiple electrodes often combine nonlinearly drive neural responses, making evoked responses difficult predict and control. This response nonlinearity could arise from the interaction excitable sites each cell, any which can produce a spike. this multi-site activation hypothesis is...
Silicon-based planar microelectronics is a powerful tool for scalably recording and modulating neural activity at high spatiotemporal resolution, but it remains challenging to target structures in three dimensions (3D). We present method directly fabricating 3D arrays of tissue-penetrating microelectrodes onto silicon microelectronics. Leveraging high-resolution printing technology based on 2-photon polymerization scalable microfabrication processes, we fabricated 6,600 10-130 μm tall 35-μm...
Epiretinal implants are designed to restore visual function by direct stimulation of retinal ganglion cells (RGCs) with a multi-electrode array. However, the efficacy present-day epiretinal is limited indiscriminate, simultaneous activation many RGCs different types that normally convey distinct information, resulting in highly unnatural signals. Even high-density arrays laboratory setting, single-electrode often cannot target an individual cell selectively. A possible solution use spatially...
Neural interfaces are designed to evoke specific patterns of electrical activity in populations neurons by stimulating with many electrodes. However, currents passed simultaneously through multiple electrodes often combine nonlinearly drive neural responses, making evoked responses difficult predict and control. This response nonlinearity could arise from the interaction excitable sites each cell, any which can produce a spike. this multi-site activation hypothesis is verify experimentally.
We present the DC Stark tuning of single Silicon Vacancies in SiC. demonstrate static across 200 GHz, exceeding inhomogenous broadening, and dynamic on timescales shorter than optical decay rate.
We use arrays of electrically connected bowtie nanoantennas to detect the carrier-envelope phase few-cycle optical pulses with noise performance close shot-noise limit. Our results pave way towards low-cost, low-profile CEP monitoring and tagging.
We study carrier-envelope-phase-sensitive (CEP-sensitive) photoemission from plasmonic nanoparticles illuminated with few-cycle laser pulses of varying intensity. The CEP- sensitive photocurrent exhibits antiresonant-like behavior due to competing emission different optical half-cycles.
We use arrays of electrically connected bowtie nanoantennas to detect the carrier-envelope phase few-cycle optical pulses with noise performance close shot-noise limit. Our results pave way towards low-cost, low-profile CEP monitoring and tagging.