Caldwell Nanophotonic Materials and Devices Lab

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Thanks for visiting the Caldwell Nanophotonic Materials and Devices website. Find out more about our team, research, publications and how to join us.

Highlights and Latest News

20191204_200611

Congratulations to Sam White, winner of a ‘Best Poster’ at MRS Fall

Tom, Ryan and Sam recently attended MRS fall to present some of our work on boron nitride, silicon carbide and cadmium oxide. Sam was awarded a best poster award for his work on VO2 as a high quality substrate for 2D materials!... KEEP READING

Posted on Friday, December 6th, 2019 in News | No Comments »


Tom working on the alignment.

Tom features in ‘postdoc spotlight’

Tom has been highlighted by the Vanderbilt University graduate school for his work on polariton propagation in hBN. Check out his profile here... KEEP READING

Posted on Monday, September 30th, 2019 in News | No Comments »


2019_SummerStudents

Summer students do top research

Thanks to Autumn and Alyssa for all the hard work they put in this summer. Both had really productive summers, and managed to get a lot of great data studying the detection of gasses and liquids using infrared spectroscopy. In particular, congratulations to Alyssa – who won the NSF REU best poster award!... KEEP READING

Posted on Monday, August 12th, 2019 in News | No Comments »


XH_Paper1

New work on crystalline hybrids published in ACS Nano

Our work using atomic-scale superlattices to control the IR dielectric function was just published in ACS Nano!... KEEP READING

Posted on Friday, August 2nd, 2019 in News | No Comments »


JAP - Figure 1-01

Tutorial Published in the Journal of Applied Physics

Check out our new tutorial, co-authored with Prof. Dan Wasserman at UT Austin. We discuss the physics and measurement of infrared polaritons, comprehensively reviewed for the first time!... KEEP READING

Posted on Tuesday, May 21st, 2019 in News | No Comments »


Nanovation with Prof. Michael Filler

Had the opportunity to be interviewed by Prof. Mike Filler from Georgia Tech for his podcast Nanovation. He has interviewed some awesome folks. Honored he included me! Thanks Mike! Really enjoyed the opportunity!... KEEP READING

Posted on Monday, April 15th, 2019 in News | No Comments »


Tom Folland receives Honorable Mention for Vanderbilt Postdoc of the Year!

Dr. Tom Folland was awarded an Honorable Mention in this year’s Vanderbilt Postdoc of the Year Award.  Given annually to one winner, Tom was one of only three postdocs recognized University wide, with his exceptional abilities as a researcher, mentor, instructor and grant writer being honored.  A big congrats to Tom for this outstanding achievement!... KEEP READING

Posted on Monday, April 15th, 2019 in News | No Comments »


Zone-folding of optic phonons allows for hybridization with transverse phonon polaritons, which are transverse in nature.  This potentially allows for the direct electrical stimulation of phonon polaritons, something that is typically not possible due to the mismatch in polarization.

Check out our most recent publication!

In this work, we demonstrated the potential for overcoming the polarization selection rules that limit direct electrical excitation of phonon polaritons by using hybridized, zone-folded longitudinal optic phonons with transverse polarized localized surface phonon polaritons.  ... KEEP READING

Posted on Monday, April 15th, 2019 in News | No Comments »


TOC-01

Congrats on Publication of Tunable Strong Polariton Coupling in Nano Letters

Our work on polaritonic strong coupling within cadmium oxide bilayers was just published in Nano Letters!  Congrats to Evan, Kyle, Tom, Ryan, Nader and Jon-Paul!  ... KEEP READING

Posted on Tuesday, January 1st, 2019 in News | No Comments »


He looks like a natural!

SiC Workshop Attended by Josh and Ryan

Both Josh and Ryan attended and presented at the recent Silicon Carbide Materials & Devices Workshop at the Air Force Research Lab.  Josh presented an invited talk on implications for SiC for advanced infrared optics and nanophotonics, while Ryan presented a poster highlighting recent results from a collaboration with Greg Walker’s group (Vanderbilt) on harnessing waste...... KEEP READING

Posted on Saturday, December 29th, 2018 in News | No Comments »


Ma et al. show that the material molybdenum trioxide can be used to precisely control the polarization of infrared light. a, Optical components known as waveplates can convert linearly polarized light into circularly polarized light. In the infrared, a waveplate made of a conventional material requires a thickness in excess of 1 millimetre. This material could be replaced with a thin slab of molybdenum trioxide, with a thickness on the order of tens of micrometres. b, Components called polarizers can convert unpolarized light (in which the polarization points in all directions) into linearly polarized light. In the infrared, polarizers made from conventional materials typically need to be thick and use a large grid of metal wires. Such a structure could be replaced with a thin film of molybdenum trioxide that requires essentially no fabrication. c, Nanoscale photonic structures made from conventional materials can emit unpolarized infrared light. But if molybdenum trioxide were used, linearly polarized emission could be achieved.

New class of anisotropic material discovered

Check out Tom’s and Joshes News and Views covering the applications and implications of the recent work by Ma et. al. on Molybdenum trioxide – a new class of natural hyperbolic material... KEEP READING

Posted on Tuesday, November 20th, 2018 in News | No Comments »


OptExp_10-29-18

Our work using plasmonic band structure to understand polaritons in metamaterials was just published!

Our work using plasmonic band structure to understand polariton hybridization in metamaterials was just published in Optics Express! Check it out here!... KEEP READING

Posted on Monday, October 29th, 2018 in News | No Comments »


Reconfigurable Hyperbolic Metasurface

Refraction of Hyperbolic Polaritons using Phase Change Materials

We are delighted to say that our work on controlling hyperbolic polaritons in hBN using the phase change material VO2 has been published in Nature Comms! Also – Check out Tom and Josh’s News and Views published in nature this week!  ... KEEP READING

Posted on Friday, October 26th, 2018 in News | No Comments »


ATR_Figure

Our work probing hyperbolic polaritons using infrared attenuated total reflectance was just published in MRS Communications!

We’re very excited to have published our work using the attenuated total reflectance technique to probe the hyperbolic phonon polaritons in hexagonal boron nitride. This technique is a great new tool in exploring a host of 2D materials! Check it out here.... KEEP READING

Posted on Tuesday, October 2nd, 2018 in News | No Comments »


Our work chosen as an one of the Top Advances in Engineering!

Poking at phonon-polaritons at the nanoscale  ... KEEP READING

Posted on Wednesday, August 29th, 2018 in News | No Comments »