Near-field coupling of absorbing material to subwavelength cavities

In conjunction with our previous work on spectral transmission dependence on geometric parameters for subwavelength slits, we have investigated the optical behavior with the inclusion of an absorber on the extraordinary optical transmission of sliver slits resonant in the mid-wave infrared (MWIR). The placement of an absorbing layer causes a dramatic change to the dielectric environment of the subwavelength slit causing the cavity to become energetically leaky. We have found this broadens the spectral response of the cavity by increasing the imaginary component of the effective cavity index, reducing the cavity quality by a factor of more than seven. To mitigate this undesired effect, we have found that partially decoupling the absorber with a thin isolating layer helps restore the slit's narrow spectral response and we explore the dependence of optical properties on the isolating layer's depth. The optimum thickness of a silicon dioxide isolation layer for best quantum efficiency (Q.E.) was found to be 100 nm with a maximum Q.E. of 37.5%. This is more than double the Q.E. of the directly coupled absorber and the cavity Q increase is of the same order, with a corresponding narrowing of the resonance bandwidth. In addition, we explore the effect on the cavity of changing the dielectric environment at the input of the slit to improve the resonance properties in the propagation direction improving the Q by 20% and improving the Q.E. to 40.2%. © 2021 Optical Society of America.Open access journalThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

Visualization 1: Imaging with multi-spectral mosaic-array cameras

Comparison of raw collected data (left) and demosaicking (right) videos using false color RGB representation Originally published in Applied Optics on 01 November 2015 (ao-54-31-F149

Visualization 2: Imaging with multi-spectral mosaic-array cameras

Comparison of band independent interpolation (left) and demosaicking (right) videos using false color RGB representation Originally published in Applied Optics on 01 November 2015 (ao-54-31-F149

Real-time mapping of electronic structure with single-shot two-dimensional electronic spectroscopy

Electronic structure and dynamics determine material properties and behavior. Important time scales for electronic dynamics range from attoseconds to milliseconds. Two-dimensional optical spectroscopy has proven an incisive tool to probe fast spatiotemporal electronic dynamics in complex multichromophoric systems. However, acquiring these spectra requires long point-by-point acquisitions that preclude observations on the millisecond and microsecond time scales. Here we demonstrate that imaging temporally encoded information within a homogeneous sample allows mapping of the evolution of the electronic Hamiltonian with femtosecond temporal resolution in a single-laser-shot, providing real-time maps of electronic coupling. This method, which we call GRadient-Assisted Photon Echo spectroscopy (GRAPE), eliminates phase errors deleterious to Fourier spectroscopies while reducing the acquisition time by orders of magnitude using only conventional optical components. In analogy to MRI in which magnetic field gradients are used to create spatial correlation maps, GRAPE spectroscopy takes advantage of a similar type of spatial encoding to construct electronic correlation maps. Unlike magnetic resonance, however, this spatial encoding of the nonlinear polarization along the excitation frequency axis of the two-dimensional spectrum results in no loss in signal while simultaneously reducing overall noise. Correlating the energy transfer events and electronic coupling occurring in tens of femtoseconds with slow dynamics on the subsecond time scale is fundamentally important in photobiology, solar energy research, nonlinear spectroscopy, and optoelectronic device characterization

Data associated with: Recording animal-view videos of the natural world using a novel camera system and software package

<p>Data associated with Vasas V, Lowell MC*, Villa J*, Jamison QD*, Siegle AG*, Katta PVR*, Bhagavathula P*, Kevan PG, Fulton D, Losin N, Kepplinger D, Salehian S, Forkner RE, Hanley D (2023) Recording animal-view videos of the natural world using a novel camera system and software package. PLoS Biology. DOI: 10.1371/journal.pbio.3002444</p&gt

Hardware associated with: Recording animal-view videos of the natural world using a novel camera system and software package

<p>The modular 3D printed housing for the camera system described in:</p><p>Vasas V, Lowell MC*, Villa J*, Jamison QD*, Siegle AG*, Katta PVR*, Bhagavathula P*, Kevan PG, Fulton D, Losin N, Kepplinger D, Salehian S, Forkner RE, Hanley D (2023) Recording animal-view videos of the natural world using a novel camera system and software package. PLoS Biology. DOI: 10.1371/journal.pbio.3002444</p><p> </p><p> </p&gt