Open-source silicon microprobes



We have developed silicon microprobes containing up to 256 electrodes optimized for recording large-scale neural activity (single-unit and LFP). There are a number of design variants containing between 32 and 256 electrodes tailored for different anatomical regions. The technology can be readily integrated with optical fibers for combined optogenetic and electrophysiological experiments. Thanks to support from the NSF NeuroNex program we are pleased to offer substantial quantities of microprobes as research tools to the neuroscience community.

The probes are primarily packaged for acute head-fixed animal measurements, but our 32 channel package is also suited for small freely moving animal recordings.


Click here to read a paper about our open source silicon microprobes.

Procedure for obtaining pre-fabricated microprobes:


1. Click here to download information on available microprobe designs, packaging, compatible hardware options, and miscellaneous information on using the probes (e.g., electroplating, epoxy encapsulation, wirebond pad dimensions). Also visit our Github file repository for up-to-date information on electrode maps, design files, instructional videos, and other useful resources.

2. Send an e-mail to Sotiris Masmanidis (smasmanidis@ucla.edu) specifying the type and number of microprobes you would like. If you are a first time user please limit initial requests to six 64 or 128 electrode microprobes. We will accommodate requests for larger quantities to experienced users as long as supplies last.

3. We will forward your request to a third-party chip-on-board manufacturer who will provide you a quote for assembly and packaging. Note that the manufacturer does their best to ensure 100% yield but can neither guarantee this nor can perform testing of individual electrode functionality. We declare no financial conflict of interest in this process.

4. You will receive a packaged microprobe from the manufacturer that is ready to use after a simple process involving encapsulating the wire bonds with epoxy for protection. Users are responsible for encapsulating the probes themselves, and attaching any optical fibers that may be required. We further recommend gold electroplating the electrodes for enhanced signal-to-noise ratio recordings. The 128 channel Intan head stage supports recording, electroplating, and impedance checking functions. Some sample data acquired with these tools is shown below. Microprobes can be reused dozens of times in acute experiments if appropriately cleaned after each recording session.


Technology resources supported by this NSF NeuroNex grant:

Miniscopes


Please note these microprobes are not intended for clinical use.