Nanophotonics Laboratory

Harnessing subwavelength and wavelength-scale optics to engineer novel photonic platforms for sensing, security, computing, and beyond

Publications & Featured Research

Our research has been published in leading journals including PNAS, ACS Photonics, Optics Express, Nanophotonics, and ACS Applied Nano Materials. For a complete list of publications, conference proceedings, and preprints, please visit our Google Scholar page.

Full Publication List

Click to view detailed publications by year

2025
  • F. Bin-Tarik, Y. Lao, M. Hammood, J. Barnes, M. Mahanloo, L. Chrostowski, T. Khan, and J. D. Ryckman, "Optoelectronic Physical Unclonable Functions and Reservoir-Inspired Computation with Low Symmetry Integrated Photonics," ACS Photonics, in press (2025). https://doi.org/10.1021/acsphotonics.5c02117
  • T. Dash†, S. Gafsi†, E. M. Dos Santos, I. Kravchenko, and J. D. Ryckman, "Responsive Visible-Wavelength Metasurfaces from Porous Silicon," Adv. Optical Mater. e02295 (2025). https://doi.org/10.1002/adom.202502295
  • M. Panipinto, A. M. Gomez-Aldaravi, D. Ortiz de Zárate, J. García-Rupérez, and J. D. Ryckman, "Nanoimprinting of Mesoporous Titania: Direct Patterning and Refractive Index Control in the Visible," Adv. Optical Mater. 13, no. 27 (2025): e01401. https://doi.org/10.1002/adom.202501401
  • T. Dash, E. Marques Dos Santos, T. H. Talukdar, and J. D. Ryckman, "C2LI: Enhancing Structural Color Sensing and Imaging via Complementary Color Laser Illumination," Adv. Optical Mater. 13, no. 26 (2025): 13, e00966. https://doi.org/10.1002/adom.202500966 [featured on back cover, September 2025]
  • S. Gafsi and J. D. Ryckman, "All-dielectric metawaveguide ring resonators with deeply sub-diffractive mode volumes," Laser Photonics Rev. 19, 2401579 (2025). https://doi.org/10.1002/lpor.202570042 [featured on front cover, June 2025]
2024
  • N. Kumar, E. M. Dos Santos, T. H. Talukdar, and J. D. Ryckman, "Quantitative Dynamic Structural Color: Dual-Band Hyperchromatic Sensing with Mesoporous Metamaterials," Adv. Optical Mater. 12, 2470080 (2024). https://doi.org/10.1002/adom.202401152 [featured on front cover, September 2024]
  • M. Panipinto and J. D. Ryckman, "Effective medium metasurfaces using nanoimprinting of the refractive index: design, performance, and predictive tolerance analysis," Opt. Mater. Express 14, 847-861 (2024). https://doi.org/10.1364/OME.515617
2022
  • A. L. Hardison, T. H. Talukdar, I. Kravchenko, and J. D. Ryckman, "Digital and gradient refractive index planar optics by nanoimprinting mesoporous silicon," Adv. Opt. Mater. 2201597 (2022). https://doi.org/10.1002/adom.202201597 [featured on inside cover, December 2022]
  • F. Bin-Tarik, A. Famili, Y. Lao, and J. D. Ryckman, "Scalable and CMOS compatible silicon photonic physical unclonable functions for supply chain assurance," Sci. Rep. 12, 15653 (2022). https://doi.org/10.1038/s41598-022-19796-z
  • A. Sharstniou, S. Niauzorau, A. L. Hardison, M. Puckett, N. Krueger, J. D. Ryckman, B. Azeredo "Roughness suppression in electrochemical nanoimprinting of Si for applications in silicon photonics," Adv. Mater. 2206608 (2022). https://doi.org/10.1002/adma.202206608
  • S. Gafsi†, F. Bin-Tarik†, C. T. Nelson and J. D. Ryckman, "Optically resonant all-dielectric diabolo nanodisks," Appl. Phys. Lett. 120, 261702 (2022). https://doi.org/10.1063/5.0089007
  • T. H. Talukdar, A. L. Hardison, and J. D. Ryckman, "Moiré effects in silicon photonic nanowires," ACS Photonics 9(4), 1286-1294 (2022). https://doi.org/10.1021/acsphotonics.1c01800
  • F. Bin-Tarik and J. D. Ryckman, "Fabrication tolerant coupling between silicon strip and subdiffraction V-groove waveguides," Opt. Continuum 1, 453-461 (2022). https://doi.org/10.1364/OPTCON.451727
2020
  • T. H. Talukdar, B. McCoy, S. Timmins, T. Khan and J. D. Ryckman, "Hyperchromatic structural color for perceptually enhanced sensing by the naked eye," PNAS 117(48), 30107-30117 (2020). https://doi.org/10.1073/pnas.2009162117
  • T. H. Talukdar and J. D. Ryckman, "Multifunctional focusing and accelerating of light with a simple flat lens," Opt. Express 28, 30597 (2020). https://doi.org/10.1364/OE.402572
  • N. Sakib and J. D. Ryckman, "Design of ultra-small mode area all-dielectric waveguides exploiting the vectorial nature of light," Opt. Lett. 45, 4730-4733 (2020). https://doi.org/10.1364/OL.394848
  • T. H. Talukdar, J. C. Perez, and J. D. Ryckman, "Nanoimprinting of Refractive Index: Patterning Subwavelength Effective Media for Flat Optics," ACS Appl. Nano Mater. 3(8), 7377-7383 (2020). https://doi.org/10.1021/acsanm.0c01395
  • F. Bin-Tarik, A. Famili, Y. Lao, and J. D. Ryckman, "Robust optical physical unclonable function using disordered photonic integrated circuits," Nanophotonics 9(9), 2817-2828 (2020). https://doi.org/10.1515/nanoph-2020-0049
2019
  • T. H. Talukdar, G. D. Allen, I. Kravchenko, and J. D. Ryckman, "Single-mode porous silicon waveguide interferometers with unity confinement factors for ultra-sensitive surface adlayer sensing," Opt. Express 27, 22485-22498 (2019). https://doi.org/10.1364/OE.27.022485
2018
2017 & Earlier
  • G. A. Rodriguez†, J. D. Ryckman†, Y. Jiao, S. M. Weiss, "A size selective porous silicon grating-coupled Bloch surface and sub-surface wave biosensor," Biosens Bioelectron 53, 486 (2014). https://doi.org/10.1016/j.bios.2013.10.028
  • J. D. Ryckman, K. A. Hallman, R. E. Marvel, R. F. Haglund, and S. M. Weiss, "Ultra-compact silicon photonic devices reconfigured by an optically induced semiconductor-to-metal transition," Opt. Express 21, 10753 (2013). https://doi.org/10.1364/OE.21.010753
  • J. D. Ryckman, Y. Jiao, and S. M. Weiss, "Three dimensional patterning and morphological control over porous nanomaterials by gray-scale direct imprinting," Sci. Rep. 3, 1502 (2013). https://doi.org/10.1038/srep01502
  • Y. Jiao, J. D. Ryckman, D. S. Koktysh, and S. M. Weiss, "Controlling surface enhanced Raman scattering using grating-type patterned nanoporous gold substrates," Opt. Mat. Express 3, 1137-1148 (2013). https://doi.org/10.1364/OME.3.001137
  • J. D. Ryckman and S. M. Weiss, "Low mode volume slotted photonic crystal single nanobeam cavity," Appl. Phys. Lett. 101, 071104 (2012). https://doi.org/10.1063/1.4742749 [APL cover article, August 13th 2012 issue; featured in Optics & Photonics News December 2013 special issue]
  • J. D. Ryckman, V. Diez-Blanco, J. Nag, R. E. Marvel, B. K. Choi, R. F. Haglund, and S. M. Weiss, "Photothermal optical modulation of ultra-compact hybrid Si-VO2 ring resonators," Opt. Express 20, 13215-13225 (2012). https://doi.org/10.1364/OE.20.013215
  • J. D. Ryckman and S. M. Weiss, "Localized field enhancements in guided and defect modes of a periodic slot waveguide," IEEE Photon. J. 3, 986-995 (2011). https://doi.org/10.1109/JPHOT.2011.2170966
  • Y. Jiao, J. D. Ryckman, P. N. Ciesielski, C. A. Escobar, G. K. Jennings, and S. M. Weiss, "Patterned nanoporous gold as an effective SERS template," Nanotechnol. 22, 295302 (2011). https://doi.org/10.1088/0957-4484/22/29/295302
  • J. D. Ryckman, M. Liscidini, J. E. Sipe, and S. M. Weiss, "Direct imprinting of porous substrates: A rapid and low-cost approach for patterning porous materials," Nano Lett. 11, 1857-1862 (2011). https://doi.org/10.1021/nl1028073 [featured on cover, May 2011 issue]
  • J. D. Ryckman, R. A. Reed, R. A. Weller, D. M. Fleetwood, and S. M. Weiss, "Enhanced room temperature oxidation in silicon and porous silicon under 10keV x-ray irradiation," J. Appl. Phys. 108, 113528 (2010). https://doi.org/10.1063/1.3512965
  • J. D. Ryckman, M. Liscidini, J. E. Sipe, and S. M. Weiss, "Porous silicon structures for low-cost diffraction-based biosensing," Appl. Phys. Lett. 96, 171103 (2010). https://doi.org/10.1063/1.3421545 [Selected to appear in Virtual Journal of Biological Physics Research vol. 19, issue 9 (2010)]
  • G. Rong, J. D. Ryckman, R. Mernaugh, and S. M. Weiss, "Label-free porous silicon membrane waveguide for DNA sensing," Appl. Phys. Lett. 93, 161109 (2008). https://doi.org/10.1063/1.3005620 [Also appears in Virtual Journal of Biological Physics Research vol. 16, issue 9 (2008) and Virtual Journal of Nanoscale Science & Technology vol. 18, issue 18 (2008)]

Research Areas

Silicon Photonics

Developing integrated silicon photonic devices and components for computing, communications, and sensing applications. Miniaturization enables record-setting device sensitivities, efficiencies, and densities in a wafer-scale production format.

Porous Nanomaterials

Studying and applying mesoporous silicon, silica, and titania to construct high-performance photonic nanostructures, devices, and sensors. These ultra-high surface area materials enable unprecedented sensitivity and tunability in optical devices.

Optical Biosensing & Structural Color

Creating lab-on-chip technology and nano-manufactured sensor chips for trace-level biosensing and advanced diagnostics. Pioneering multichromatic laser illumination techniques enable both quantitative measurements and perceptually enhanced colorimetric sensing for food safety and biomedical applications.

Metasurfaces & Nanofabrication

Designing multi-functional metasurfaces for light manipulation and beam steering, while pioneering novel imprint-based methods for nanomanufacturing, including nanoimprinting of refractive index and structural color-based sensing platforms.

Disordered Photonics

Disordered systems unlock new possibilities in active and passive photonics with minimal design overhead. Our group explores innovative ways to harness disordered nanophotonics for practical applications in sensing and light manipulation.

Hardware Security

Applying photonic platforms to address challenges in hardware and information security through novel device architectures and sensing modalities.

Laboratory Facilities

Advanced Materials Research Laboratory
Advanced Materials Research Laboratory
Duke Energy Innovation Center
Duke Energy Innovation Center
Clemson University Campus
Clemson University

The Nanophotonics Laboratory is located at the Duke Energy Innovation Center within Clemson's Advanced Materials Center research park. Our state-of-the-art facilities include access to the Micro Fabrication Facility (ECE Cleanroom), Electron Microscope Laboratory, and the 100,000+ sq ft Advanced Materials Research Laboratory (AMRL), which houses internationally recognized research programs in optoelectronics, chemistry, and materials science.

Principal Investigator

Dr. Judson D. Ryckman

Dr. Judson D. Ryckman

Associate Professor

Holcombe Department of Electrical and Computer Engineering

Dr. Ryckman received his B.E. and Ph.D. degrees in Electrical Engineering from Vanderbilt University (2008, 2013). Following graduation, he joined Intel Labs as a Research Scientist in silicon photonics, contributing to the transition of silicon photonics from research into commercial products. He joined Clemson University faculty in 2016, establishing the Nanophotonics Laboratory.

Dr. Ryckman is the recipient of the NSF CAREER Award and the Air Force Office of Scientific Research Young Investigator Program Award. He is a named inventor on more than eight issued U.S. patents, a Senior Member of IEEE and Optica, and serves on technical committees for conferences such as IEEE Optical Interconnects.

Graduate Students

Click to view current and former students

Current Graduate Students
  • Matthew Panipinto (Summer 2022–Present, ECE)
  • Tomoshree Dash (Spring 2024–Present, ECE)
  • Gaurav Desai (Spring 2025–Present, ECE)
Former Ph.D. Students
  • Dr. Tahmid Talukdar (Intel, Apple)
  • Dr. Farhan Bin-Tarik (Florida Poly)
  • Dr. Saddam Gafsi (SiLC Technologies Inc.)
Former M.S. Students
  • Nazmus Sakib
  • Cody Nelson
  • Anna Hardison
  • Nithesh Kumar

News & Updates

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Contact Information

Nanophotonics Laboratory

Location: Duke Energy Innovation Center

81 Technology Drive, Clemson, SC 29634

Principal Investigator: Dr. Judson D. Ryckman

Email: jryckma@clemson.edu

LinkedIn: linkedin.com/in/judsonryckman

Department: Holcombe Department of Electrical and Computer Engineering

Clemson University