Optical Correlators
Hybrid Opto-electronic Correlator (HOC) with phase scanning and stabilization
Diagram of an HOC
Experimental output of an HOC with shift, scale, and rotation insensitivity
Balanced Joint Transform Correlator (BJTC)
Diagram of a BJTC, which combines an HOC with a JTC
After getting the BJTC operational for the first time!
FiO 2023 poster on the use of an HOC for fundamental science research
Presenting the HOC at AMOS 2022, where I won the Best Presentation award
AMOS 2023 poster on ultra-high-speed operation of an HOC
Custom SLM mount I designed to aid in alignment. Meant to be used with a TI DLP471 DMD SLM
FPGA + focal plane array for my opto-electronic correlators (using a Xilinx Ultrascape+ VCU118 dev-board)
Closeup picture of an optical engine for the HOC
PQ:PMMA Volume Holograms
Holographic gratings on a ~2 mm thick PQ:PMMA disk I made
WDM holograms on another PQ:PMMA disk
PQ:PMMA cylinder with wide FOV holograms
PQ:PMMA molded into cylindrical lenses. Fresh from the oven on Dec. 29 2023! The resulting holograms will be fascinating!
HOEs going into the oven in the darkroom
Hologram diffraction on a PQ:PMMA cylinder
Fully automated HOE writing/characterization system for wavelength division multiplexing (WDM) & demultiplexing (DeMUX) at arbitrary wavelengths, as well as for writing storage holograms with thousands of multiplexed images
Custom device to automatically position HOE disks in their correct orientation for writing or characterization
Exposing a PQ:PMMA cylinder for wide FOV holograms
PQ:PMMA absorption spectrum for an exposed sample. I used this to make a model of Δn(λ)
Comparison of Δn(λ) from my model vs the measured value
Angular selectivity for a ~2 mm thick PQ:PMMA disk with 3x NIR WDM at the corresponding NIR wavelengths
Diagram for 6x WDM at 1550 nm using PQ:PMMA HOEs
Experimental 6x WDM setup for ~1550 nm using PQ:PMMA HOEs
Demultiplexed output of the 6x WDM system
Monocular Passive Ranging (MPR) device using a PQ:PMMA DeMUX HOE as a wavelength filter. The interior has an HOE, three avalanche photodetectors, and an aiming camera
Overlap of HOE DeMUX filters (blue, red, yellow) with O2 absorption spectrum (purple)
MPR distance measurement experiment using a reference light source
Photonic Integrated Circuits
SEM micrograph of an edge-emitting laser I fabricated on an AlGaAs substrate
Various DBR laser waveguides patterned on a chip (after eBL, prior to etching)
Free-space coupling to an edge-emitting laser
DBR laser emitting from the front facet
DBR output without collimation
DBR output after collimating
At Argonne's the Center for Nanoscale Materials (CNM)
Sputtering Cr & Au at the CNM cleanroom
Performing e-beam lithography (eBL) at the CNM cleanroom
Volunteering & Outreach
Prof. Manijeh Razeghi giving a seminar I organized for the SPIE student chapter
Another SPIE seminar I organized
A recent SPIE seminar I organized
Food for an outreach event
SPIE student chapter outing
A recent SPIE seminar I organized
Exhibition for the robotics team I founded at ITESM
The team of highschool students I mentored for Berkeley's Pioneers in Engineering outreach program
The Berkeley exchange student hiking group I started during my own exchange program