Sander A. Mann
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Million-Q Free Space Meta-Optical Resonator at Visible Wavelengths Open
High-quality (Q)-factor optical resonators with extreme temporal coherence are of both technological and fundamental importance in optical metrology, continuous-wave lasing, and semiconductor quantum optics. Despite extensive efforts in de…
Intersubband polaritonic metasurfaces for high-contrast ultra-fast power limiting and optical switching Open
Nonlinear intersubband polaritonic metasurfaces support one of the strongest known ultrafast nonlinear responses in the mid-infrared frequency range across all condensed matter systems. Beyond harmonic generation and frequency mixing, thes…
Nanoscale Photovoltaics Open
Commercially available solar cells typically operate in the ray optics regime, where traversable distances within the solar cell are many wavelengths long. In this chapter, we cover nanoscale solar cells, where the dimensions are on the or…
Intersubband polaritonic metasurfaces for high-contrast ultra-fast power limiting and optical switching Open
Nonlinear intersubband polaritonic metasurfaces support one of the strongest known ultrafast nonlinear responses in the mid-infrared frequency range across all condensed matter systems. Beyond harmonic generation and frequency mixing, thes…
Spatio-Temporal Coupled Mode Theory for Nonlocal Metasurfaces Open
Diffractive nonlocal metasurfaces have recently opened a broad range of exciting developments in nanophotonics research and applications, leveraging spatially extended (yet locally patterned) resonant modes to control light with new degree…
Lower Bounds to the Q Factor of Electrically Small Resonators Through Quasistatic Modal Expansion Open
The problem of finding the optimal current distribution supported by small radiators yielding the minimum quality (Q) factor is a fundamental problem in electromagnetism. Q factor bounds constrain the maximum operational bandwidth of devic…
Bandwidth of Singular Plasmonic Resonators in Relation to the Chu Limit Open
Plasmonic nanostructures with singular geometries can exhibit a broadband scattering response that at first glance appears to violate the lower bounds for the radiation quality (Q) factor of small radiators, known as the Chu limit. Here we…
Lower Bounds to the Q factor of Electrically Small Resonators through Quasistatic Modal Expansion Open
The problem of finding the optimal current distribution supported by small radiators yielding the minimum quality (Q) factor is a fundamental problem in electromagnetism. Q factor bounds constrain the maximum operational bandwidth of devic…
Lower Bounds to Quality Factor of Small Radiators through Quasistatic Scattering Modes. Open
The problem of finding the optimal current distribution supported by a small radiator yielding the minimum quality ($Q$) factor is a fundamental problem in electromagnetism. $Q$ factor bounds constrain the maximum operational bandwidth of …
On the bandwidth of singular plasmonic resonators in relation to the Chu\n limit Open
Plasmonic nanostructures with singular geometries can exhibit a broadband scattering response that at first glance appears to violate the lower bounds for the radiation quality (Q) factor of small radiators, known as the Chu limit. Here we…
Thermal Metasurfaces: Complete Emission Control by Combining Local and Nonlocal Light-Matter Interactions Open
Metasurfaces have been enabling the miniaturization and integration of complex optical functionalities within an ultrathin platform by engineering the scattering features of localized modes. However, these efforts have mostly been limited …
Ultrafast optical switching and power limiting in intersubband polaritonic metasurfaces Open
Highly nonlinear optical materials with fast third-order nonlinear optical response are crucial for the operation of all-optical photonic devices, such as switches for signal processing and computation, power limiters, and saturable absorb…
Nonreciprocal cavities and the time-bandwidth limit: reply Open
We reply to the comment on our recent article [Optica6, 104 (2019)OPTIC82334-253610.1364/OPTICA.6.000104], in which we demonstrated that nonreciprocal cavities comply with the resonance time-bandwidth limit. We fully stand by our original …
Nonreciprocal cavities and the time–bandwidth limit Open
The time-bandwidth limit inherently relates the lifetime of a resonance and its spectral bandwidth, with direct implications on the maximum storage time of a pulse versus its frequency content. It has been recently argued that nonreciproca…
Imaging a Nitrogen-Vacancy Center with a Diamond Immersion Metalens Open
Solid-state quantum emitters have emerged as robust single-photon sources and addressable spins: key components in rapidly developing quantum technologies for broadband magnetometry, biological sensing, and quantum information science. Per…
Perovskite Nanowire Extrusion Open
The defect tolerance of halide perovskite materials has led to efficient optoelectronic devices based on thin-film geometries with unprecedented speed. Moreover, it has motivated research on perovskite nanowires because surface recombinati…
Nano-antenna enhanced two-focus fluorescence correlation spectroscopy Open
We propose two-focus fluorescence correlation spectroscopy (2fFCS) on basis of plasmonic nanoantennas that provide distinct hot spots that are individually addressable through polarization, yet lie within a single diffraction limited micro…
Integrating Sphere Microscopy for Direct Absorption Measurements of Single Nanostructures Open
Nanoscale materials are promising for optoelectronic devices because their physical dimensions are on the order of the wavelength of light. This leads to a variety of complex optical phenomena that, for instance, enhance absorption and emi…
Super-resolution imaging of light–matter interactions near single semiconductor nanowires Open
Nanophotonics is becoming invaluable for an expanding range of applications, from controlling the spontaneous emission rate and the directionality of quantum emitters, to reducing material requirements of solar cells by an order of magnitu…
Indirect to direct bandgap transition in methylammonium lead halide perovskite Open
Unusually long charge carrier lifetime in methylammonium lead halide perovskites is a result of the Rashba-split indirect bandgap. At high pressure the bandgap becomes purely direct, with shorter carrier lifetime and higher radiative effic…
Generalized antireflection coatings for complex bulk metamaterials Open
We present the optimized design of an antireflection coating to efficiently couple an incident plane wave into a metamaterial with a complex field profile. We show that such an antireflection coating must enable spatial engineering of the …
Direct imaging of hybridized eigenmodes in coupled silicon nanoparticles Open
High-index dielectric nanoparticles support leaky geometrical resonances in the visible spectral range with large interaction cross sections, and find applications in nanoscale optoelectronic devices and surface coatings. Coupling between …
Quantifying limits and losses in nanoscale photovoltaics Open
The conversion efficiency of a solar panel is the most important lever in the cost of electricity it produces. For photovoltaics to make a significant and lasting impact as a renewable energy resource, the electricity costs have to decreas…