NanoPlasmonics, Microphotonics & Imaging

Research that includes:

  • Polymer, printed optical lenslet arrays
  • Microfluidic tuneable photopolymer lenses
  • Optical switches and planar lightwave MEMS
  • Vertically integrated microconfocal arrays
  • Bio-inspired integration of tuneable polymer optics with imaging electronics

BPNX1010: Foundry-Compatible Silicon Photonic MEMS Switch

Arkadev Roy
Daniel Klawson
Yiyang Zhi
Sirui Tang
Erik Anderson
2025

Integrated silicon photonic switches can serve as primary building blocks for low-latency, high-bandwidth interconnects for communication in data-intensive scenarios ranging from servers in datacenters to chiplets in multi-chip integrated packages. Our group has been developing MEMS-based large-scale silicon photonic switches which are particularly attractive for their low-loss, high-extinction, and low-power performance as well as sub-microsecond switching speed. Previous demonstrations, although fully compatible with CMOS foundries, relied upon a custom fabrication stack. The goal of the...

BPNX1058: Visible-to-Mid-Infrared Photodetection with Self-Adaptive Responsivity-Speed Tradeoff (New Project)

Dehui Zhang
Yibo Zhang
Hyong Min Kim
Jamie Geng
2025

Normal scenes captured by cameras involve light intensities spanning more than five orders of magnitude, which is often taken care of with auto-exposure/multiple exposures in high dynamic range (HDR) imaging technologies. Such technologies assign one or several uniform exposure levels and dynamic ranges for all pixels in the image, significantly squeezing the data precision for dimmer regions, causing fundamental information loss at the photodetection stage.


Ideally, each detector should independently decide its tradeoff between responsivity and speed. For
...

BPNX1026: Strong, Tunable Mid-IR Emission from Black Phosphorous Film

Kyuho Lee
Naoki Higashitarumizu
Shu Wang
Hyong Min Kim
Theodorus Jonathan Wijaya
2025

A weak van der Waals (vdW) force in layered materials enables their isolation into thin flakes through mechanical exfoliation while sustaining their intrinsic electronic and optical properties. Here, we introduce a universal roll-printing method capable of producing vdW multilayer films on wafer-to-meter scale. This process uses sequential exfoliation and transfer of layered materials from the powder sources to target substrates through a repeated rolling of a cylindrical metal drum. We achieve uniformly coated films with a library of vdW powders on various mechanically rigid and...

BPNX1025: In-Sensor Visible to Mid-Infrared Spectral Machine Vision

Dehui Zhang
Jamie Geng
Hyong Min Kim
Shifan Wang
2025

Multispectral and hyperspectral imaging are important optical inspection technologies. They collect the spatial and spectral information of the incidental light into 3D hypercubes, which can be post-processed into material and structural mapping of the scene. However, acquiring and analyzing the 3D hypercubes set great challenges in data collection, transportation, storage, and computation. The much higher energy, bandwidth, and memory budgets limit the implementation of high-speed, high-resolution hyperspectral imaging to achieve intelligent machine vision. This project introduces an...

Dehui Zhang

Postdoctoral Researcher
Electrical Engineering and Computer Sciences
Professor Ali Javey (Advisor)

Dehui Zhang is a postdoctoral researcher in Electrical Electrical Engineering and Computer Sciences at the University of California, Berkeley, a postdoctoral researcher at Berkeley Sensor & Actuator Center (BSAC), and a research affiliate in the Materials Science Division at Lawrence Berkeley National Laboratory. He received a Ph.D. in Electrical and Computer Engineering from University of Michigan, Ann Arbor in 2021, and was a postdoctoral researcher at University of California, Los Angeles in 2021-2023. Dehui Zhang joined Javey Research Group in September 2023...

A Fully Wireless, Miniaturized Multicolor Fluorescence Image Sensor Implant for Real-Time Monitoring in Cancer Therapy

Rozhan Rabbani
Micah Roschelle
Surin Gweon
Rohan Kumar
Alec Vercruysse
Nam Woo Cho
Matthew H. Spitzer
Ali M. Niknejad
Vladimir Stojanović
Mekhail Anwar
2024

Implantable sensors capable of real-time monitoring of complex cellular dynamics can provide critical information for understanding disease progression and treatment response, leading to more personalized medicine. An impactful application is in cancer immunotherapy which produces durable responses but suffers from low response rates (<50%). Multicolor fluorescence microscopy is a critical tool for the study of multi-cell type dynamics but limited optical penetration depth (<5 mm for 400-900nm) and bulky optics constrain its use in vivo. Therefore, wireless, miniaturized...

A Wireless, Multicolor Fluorescence Image Sensor Implant for Real-Time Monitoring in Cancer Therapy

Micah Roschelle
Rozhan Rabbani
Surin Gweon
Rohan Kumar
Alec Vercruysse
Nam Woo Cho
Matthew H. Spitzer
Ali M. Niknejad
Vladimir Stojanović
Mekhail Anwar
2024

Real-time monitoring of dynamic biological processes in the body is critical to understanding disease progression and treatment response. These data, for instance, can help address the lower than 50% response rates to cancer immunotherapy. However, current clinical imaging modalities lack the molecular contrast, resolution, and chronic usability for rapid and accurate response assessments. Here, we present a fully wireless image sensor featuring a 2.5 × 5 mm 2 CMOS integrated circuit for multicolor fluorescence imaging deep in tissue. The sensor operates wirelessly via...

Multicolor Fluorescence Microscopy for Surgical Guidance Using a Chip-Scale Imager with a Low-NA Fiber Optic Plate and a Multi-Bandpass Interference Filter

Micah Roschelle
Rozhan Rabbani
Efthymios Papageorgiou
Hui Zhang
Matthew Cooperberg
Bradley A. Stohr
Ali M. Niknejad
Mekhail Anwar
2024

In curative-intent cancer surgery, intraoperative fluorescence imaging of both diseased and healthy tissue can help to ensure the successful removal of all gross and microscopic diseases with minimal damage to neighboring critical structures, such as nerves. Current fluorescence-guided surgery (FGS) systems, however, rely on bulky and rigid optics that incur performance-limiting trade-offs between sensitivity and maneuverability. Moreover, many FGS systems are incapable of multiplexed imaging. As a result, clinical FGS is currently limited to millimeter-scale detection of a single...

BPN751: Large-Scale Silicon Photonic MEMS Switch with Sub-Microsecond Response Time

Johannes Henriksson
Jianheng Luo
2023

We developed a new architecture suitable for building a large-scale optical switch with fast response time. We have demonstrated switches with a scale of 240x240 and speed of sub microsecond using our new architecture. The switch architecture consists of an optical crossbar network with MEMS-actuated couplers and is implemented on a silicon photonics platform. To our knowledge this is the largest monolithic switch, and the largest silicon photonic integrated circuit, reported to date. The passive matrix architecture of our switch is fundamentally more scalable than that of multistage...

BPN882: An Ultra-Thin Molecular Imaging Skin for Intraoperative Cancer Detection Using Time-Resolved CMOS Sensors

Hossein Najafi
Mekhail Anwar
2021

Successful treatment of cancer requires targeted and individualized treatment, and subsequently an assessment of the state of the tumor being examined, both gross and microscopic, however oncologists have no method of identifying microscopic tumor in the patient. This results in tumor cells being left behind in patients undergoing surgery. Currently, the only way to determine the presence of any microscopic residual is to examine the excised tumor, stained with a proper marker, under a microscope, which only adds to the complexity and length of the surgery and treatment. The two current...