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2. Inside Front Cover

Author

Connolly, Peter W. R., primary, Valli, Jessica, additional, Shah, Yash D., additional, Altmann, Yoann, additional, Grant, James, additional, Accarino, Claudio, additional, Rickman, Colin, additional, Cumming, David R. S., additional, and Buller, Gerald S., additional

Published
2021
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4. Unity integration of grating slot waveguide and microfluid for terahertz sensing

Author

Liang, Li, Hu, Xin, Wen, Long, Zhu, Yuhuan, Yang, Xianguang, Zhou, Jun, Zhang, Yaxin, Escorcia Carranza, Ivonne, Grant, James, Jiang, Chunping, Cumming, David R.S., Li, Baojun, and Chen, Qin

Subjects
Physics::Optics
Abstract

Refractive index sensing is attracting extensive interest. Limited by the weak light–matter interaction and the broad bandwidth of resonance, the figure of merit (FoM) of terahertz (THz) sensors is much lower than their counterparts in visible and infrared regions. Here, these two issues are addressed by incorporating a microfluidic channel as a slot layer into a grating slot waveguide (GSW), where guided‐mode resonance results in a narrowband resonant peak and the sensitivity increases remarkably due to the greatly concentrated electromagnetic fields in the slot layer. Both reflective and transmissive sensors are developed with the calculated quality (Q) factors two orders of magnitude larger than metamaterial and plasmonic sensors, and the sensitivities one order of magnitude larger than grating waveguide sensors, contributing to a record high FoM of 692. The measured results match well with the simulations considering the fabrication errors, where the degeneration of narrowband transmission peaks in experiments is attributed to the error of the microfluidic channel height and the divergence of the incident beam. The proposed unity‐integrating configuration with simultaneous optimizations of the resonance mechanism, and the spatial overlap between the sensing field and the analytes shows the potential for high sensitivity bio and chemo sensing.

Published
2018

5. Metamaterial absorber integrated microfluidic terahertz sensors

Author

Hu, Xin, Xu, Gaiqi, Wen, Long, Wang, Huacun, Zhao, Yuncheng, Zhang, Yaxin, Cumming, David R.S., and Chen, Qin

Subjects
Physics::Optics
Abstract

Spatial overlap between the electromagnetic fields and the analytes is a key factor for strong light-matter interaction leading to high sensitivity for label-free refractive index sensing. Usually, the overlap and therefore the sensitivity are limited by either the localized near field of plasmonic antennas or the decayed resonant mode outside the cavity applied to monitor the refractive index variation. In this paper, by constructing a metal microstructure array-dielectric-metal (MDM) structure, a novel metamaterial absorber integrated microfluidic (MAIM) sensor is proposed and demonstrated in terahertz (THz) range, where the dielectric layer of the MDM structure is hollow and acts as the microfluidic channel. Tuning the electromagnetic parameters of metamaterial absorber, greatly confined electromagnetic fields can be obtained in the channel resulting in significantly enhanced interaction between the analytes and the THz wave. A high sensitivity of 3.5 THz/RIU is predicted. The experimental results of devices working around 1 THz agree with the simulation ones well. The proposed idea to integrate metamaterial and microfluid with a large light-matter interaction can be extended to other frequency regions and has promising applications in matter detection and biosensing.

Published
2016

7. Design and characterization of a novel diamond resonator

Author

Maricar, Mohamed Ismaeel, Glover, James, Evans, Gwynne, Khalid, Ata-ul-Habib, Cumming, David, and Oxley, Chris

Subjects
Condensed Matter::Materials Science
Abstract

In this article, the resonant frequency and quality factor of a novel coplanar waveguide (cpw) diamond-shaped resonator were analyzed using advanced design system-2009 momentum model software. The diamond resonator was compared with the cpw radial stub resonator on gallium arsenide (GaAs); the work indicated that the diamond resonator had a smaller physical size and higher quality factor (Q) at millimetric wave frequencies. Experimentally measured diamond cpw resonators fabricated on GaAs were in good agreement with the simulated results.

Published
2014

12. Understanding protected area resilience: a multi-scale, social-ecological approach

Author

Cumming, Graeme S., primary, Allen, Craig R., additional, Ban, Natalie C., additional, Biggs, Duan, additional, Biggs, Harry C., additional, Cumming, David H. M., additional, De Vos, Alta, additional, Epstein, Graham, additional, Etienne, Michel, additional, Maciejewski, Kristine, additional, Mathevet, Raphaël, additional, Moore, Christine, additional, Nenadovic, Mateja, additional, and Schoon, Michael, additional

Published
2015
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21. Bats and the Loss of Tree Canopy in African Woodlands

Author

Fenton, M. Brock, primary, Cumming, David H. M., additional, Rautenbach, I. L., additional, Cumming, Graeme S., additional, Cumming, Meg S., additional, Ford, Gavin, additional, Taylor, Russell D., additional, Dunlop, Jenna, additional, Hovorka, Mark D., additional, Johnston, Dave S., additional, Portfors, Christine V., additional, Kalcounis, Matina C., additional, and Mahlanga, Zaccheus, additional

Published
2008
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22. Bats and the Loss of Tree Canopy in African Woodlands

Author

Fenton, M. Brock, primary, Cumming, David H. M., additional, Rautenbach, I. L., additional, Cumming, Graeme S., additional, Cumming, Meg S., additional, Ford, Gavin, additional, Taylor, Russell D., additional, Dunlop, Jenna, additional, Hovorka, Mark D., additional, Johnston, Dave S., additional, Portfors, Christine V., additional, Kalcounis, Matina C., additional, and Mahlanga, Zaccheus, additional

Published
1998
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