Services
Design, Analysis, Prototype Development and Technical Writing for Optical Subsystems
Hi, I’m Joe Geddes. I combine my expertise in the design, analysis and prototype development for optical devices and subsystems with clear communication and documentation to offer comprehensive optics design consulting services. My goal is to forge a close collaboration with my clients to scope projects on the R side of the R&D spectrum, use modeling and design to reduce technical risk, and accelerate the progress to the point where my clients can build a prototype.
Optics Design and Modeling
For traditional optics and nanophotonic materials.
Multi-Physics Analysis
For systems with coupled mechanical, thermal, fluid and/or optical phenomena (e.g. BioMEMS, MEMS).
Prototype Development
Software development, modeling and experimentation for optical systems.
Research and Writing
Technical Writing including Grant Proposals, Reports and Product Literature.
How Can JG Applied Help You?
By approaching your problem through calculations and modeling, I can rapidly reduce the parameters of what you could build and/or test to what you should. By exploring the assumptions and boundaries of your optics design, I can help you ask the right questions to get the data and answers you need. This gives you the information you need to accurately scope your project, reducing project costs and schedule now and later. I can get you from idea to answers better, cheaper, faster.
Optical Ray Tracing
Ray tracing has been used in the design of lenses and optical systems including cameras, microscopes, telescopes, and binoculars since the early 20th century.
Finite-Difference Time-Domain Analysis
FDTD is a numerical analysis technique used for modeling computational electrodynamics (finding approximate solutions to the associated system of differential equations). Since it is a time-domain method, FDTD solutions can cover a wide frequency range with a single simulation run, and treat nonlinear material properties in a natural way.
Rigorous Coupled Wave Analysis
RCWA is a semi-analytical method in computational electromagnetics. It is used within the semiconductor device industry to measure trench depth and CD with results comparable to cross-section SEM. It has the benefit of being both high-throughput and non-destructive.
Recent Projects
Optical Filter Design
Feasibility analysis of metasurface design for an optical notch filter were instrumental in my client’s accurate R&D budget and timeline submittal.
Colorimetric Analysis for Biometric Anti-Reflection Coating
The expected reflectance spectra for moth-eye anti-reflection coatings designs and calculated the color saturation values to show expected colorless performance of an anti-reflection coating design were required for my client to scope their R&D project.
Raman Spectroscopy for Biochemistry Applications
Calculations for a coherent Raman spectroscopy method for tracking steroid metabolism were used by my client to select the most promising method for prostate cancer research.
Ray Tracing Analysis for Solar Applications
My client required ray tracing analysis of the performance of a new transfer-printed photovoltaic cell array integrated with a lens array to produce a peer-reviewed publication.
Clients
Publications
Sparked by an interest in exploring the benefits of imitating nature, much of my work has been investigating, modeling, prototyping and developing new optoelectronics technologies or new methods in fabrication to create new optoelectronics technologies. Of particular interest is understanding and creating materials that are not limited by the traditional planar architecture of optoelectronics. In a related research thrust, I have investigated the theory and practice of the novel photolithographic methods necessary to create these materials at a manufacturable scale.
Some recent publications and patents include:
Nature – August 2008
The human eye is a remarkable imaging device that extremely difficult to achieve using established optoelectronics technologies, so a method for creating flexible optoelectronics is described and implemented here. [Publication]
Nature Materials – November 2008
Large-scale arrays of silicon solar microcells were integrated on foreign substrates by transfer printing for mechanical flexibility, transparency and ultra thin form factors. [Publication]
S. Kim, Y. Su, A. Mihi, S. Lee, Z. Liu, T. K. Bhandakkar, J. Wu, J. B. Geddes III, H. T. Johnson, Y. Zhang, J.-K. Park, P. V. Braun, Y. Huang, and J. A. Rogers, “Imbricate scales as a design construct for microsystems technologies,” Small 8 (2012) 901-906.
Y.-C. Chen, J. B. Geddes III, L. Yin, P. Wiltzius, and P. V. Braun, “X-ray computed tomography of holographically fabricated three-dimensional photonic crystals,” Adv. Mater. 24 (2012) 2863-2868.
H. Ning, A. Mihi, J. B. Geddes III, M. Miyake, and P. V. Braun, “Radiative lifetime modification of LaF3: Nd nanoparticles embedded in three dimensional silicon photonic crystals,” Adv. Mater. 24 (2012) OP153-OP158.
J. B. Geddes III, “Syncing of modes via nonlinear coupling between closely spaced plasmonic structures,” submitted to the Materials Research Society Fall Meeting, Boston, MA (29 Nov. – 04 Dec. 2015).