The authors demonstrate doping-tunable extraordinary transmission from subwavelength apertures in a periodic two-dimensional metallic grating deposited upon n-doped GaAs. By varying the doping of the underlying GaAs epilayer, they demonstrate wavelength tunability of ∼23cm−1 or approximately 0.15μm. The authors have achieved transmission peaks as narrow as 18cm−1 with such gratings, which suggests that devices based on midinfrared extraordinary transmission gratings could be used in external cavity structures for quantum cascade lasers, or as tunable filters or modulators for midinfrared applications.

10.1063/1.2737138

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Citations (41)

Enhanced infrared detectors using resonant structures combined with thin type-II superlattice absorbers

Applied Physics Letters (2016)

Michael Goldflam Emil Kadlec B. V. Olson J. F. Klem Samuel D. Hawkins

We examined the spectral responsivity of a 1.77 μm thick type-II superlattice based long-wave infrared detector in combination with metallic nanoantennas. Coupling between the Fabry-Pérot cavity formed by the semiconductor layer and the resonant nanoantennas on its surface enables spectral selectivity, while also increasing peak quantum efficiency to over 50%. Electromagnetic simulations reveal that this high responsivity is a direct result of field-enhancement in the absorber layer, enabling significant absorption in spite of the absorber's subwavelength thickness. Notably, thinning of the absorbing material could ultimately yield lower photodetector noise through a reduction in dark current while improving photocarrier collection efficiency. The temperature- and incident-angle-independent spectral response observed in these devices allows for operation over a wide range of temperatures and optical systems. This detector paradigm demonstrates potential benefits to device performance with applications throughout the infrared.

Quantum Efficiency

Specific detectivity

10.1063/1.4972844

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Citations (49)

Intensity- and Temperature-Dependent Carrier Recombination inInAs/InAs1−xSbx

Physical Review Applied (2015)

B. V. Olson Emil Kadlec J. K. Kim J. F. Klem Samuel D. Hawkins

A judicious choice of material heterostructure could spur a breakthrough in infrared photodetector technology, for diverse uses in astronomy, medicine, and industry. Unfortunately, for this system little is known about the nonequilibrium charge-carrier dynamics, which is critical to device performance. This study outlines an approach to uniquely determine the magnitudes of the various recombination mechanisms that determine carrier lifetime, and ultimately the limitations of photodetector dark currents.

Charge carrier

Intensity

10.1103/physrevapplied.3.044010

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Exploring AlGaInP for Use in Si Photomultiplier Analogs

2018 IEEE Research and Applications of Photonics In Defense Conference (RAPID) (2024)

Evan M. Anderson Andrew Armstrong Lisa N. Caravello Eduardo García-Martínez Joseph P. Klesko

10.1109/rapid60772.2024.10646955

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Terahertz near-field spectroscopy of filled subwavelength sized apertures in thin metal films

Optics Express (2013)

J. R. Knab A. J. L. Adam Eric A. Shaner H. J. A. J. Starmans P. C. M. Planken

We have measured terahertz near-field spectra of cesium iodide crystals as small as ~10 μm in diameter, which were deposited on single, sub-wavelength-sized apertures created in thin gold films on a substrate. The advantage of using small apertures for terahertz microspectroscopy is that only terahertz light that has interacted with the cesium iodide is observed. We find that around the transverse optical phonon frequency of cesium iodide, the amplitude transmission is as much influenced by the refractive index as by the absorption. We show that the ability to measure in the near-field of the apertures, where signals are relatively strong, allows us to measure on sample volumes as small as ~5×10(-16) m(3).

10.1364/oe.21.001101

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Low Dimensional Plasmonic Spectroscopy through Inversion of the Far Infrared Detection Problem.

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2016)

Gregory C. Dyer G. R. Aizin Donald Bethke X. Shi B. V. Olson

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