Toggling between active and passive imaging with an omni-resonant micro-cavity

Shabahang, Soroush; Jahromi, Ali K.; Shiri, Abbas; Schepler, Kenneth L.; Abouraddy, Ayman F.

doi:10.1364/ol.44.001532

Cited by 14 publications

(15 citation statements)

References 29 publications

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“…In contrast, we do not modify the cavity, and omni-resonance instead results from a specific spatio-temporal structure introduced into the optical wave packet -whereas previous investigations of white-light cavities have ignored the transverse spatial structure of the field. We previously demonstrated omni-resonance using broadband incoher- ent light by introducing angular dispersion into the wave front [37,38], and have exploited this in boosting the photocurrent harvested by a cavity-embedded solar cell in the near-infrared [30]. In contrast, we show here that diffraction-free ST wave packets can resonate in a cavity and yet retain their diffraction-free behavior, transverse spatial size, temporal profile, and bandwidth independently of the resonance linewidth.…”

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confidence: 99%

Omni-resonant space–time wave packets

et al. 2020

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We describe theoretically and verify experimentally a novel class of diffraction-free pulsed optical beams that are 'omni-resonant': they have the remarkable property of transmission through planar Fabry-Pérot resonators without spectral filtering even if their bandwidth far exceeds the cavity resonant linewidth. Ultrashort wave packets endowed with a specific spatio-temporal structure couple to a single resonant mode independently of its linewidth. We confirm that such 'space-time' omni-resonant wave packets retain their bandwidth (1.6 nm), spatio-temporal profile (1.3-ps pulse width, 4-µm beam width), and diffraction-free behavior upon transmission through cavities with resonant linewidths of 0.3-nm and 0.15-nm. arXiv:1912.00092v1 [physics.optics]

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confidence: 99%

Omni-resonant space–time wave packets

et al. 2020

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“…[11,[14][15][16] Unavoidably, resonant enhancements within an optical cavity are harnessed over only narrow bandwidths as a result of the fundamental link between the cavity-photon lifetime and the resonant linewidth. [17] Here, we demonstrate that an omni-resonance scheme [18,19] can extend CPA continuously over a broad spectral bandwidth, thereby rendering this coherent-enhancement arrangement relevant for solar conversion applications. By severing the link between the cavity-photon lifetime and the resonant bandwidth, omni-resonance leads to the emergence of "achromatic" resonances [18] that can help deliver coherently enhanced broadband absorption.…”

Section: Introductionmentioning

confidence: 77%

“…[20][21][22][23][24][25] Instead, incident light is preconditioned using an alignment-free optical arrangement that assigns to each wavelength an appropriate angle of incidence. [18,19] In effect, we introduce into the incident field angular dispersion that is equal in magnitude but opposite in sign to that of the cavity. Consequently, angular dispersion cancellation allows all wavelengths within a selected band-that may extend over multiple free spectral ranges of the cavity-to resonate simultaneously, resulting in continuous-wavelength CPA and a concomitant boost in the external quantum efficiency (EQE).…”

Section: Introductionmentioning

confidence: 99%

“…Here, we demonstrate that an omni‐resonance scheme [ 18,19 ] can extend CPA continuously over a broad spectral bandwidth, thereby rendering this coherent‐enhancement arrangement relevant for solar conversion applications. By severing the link between the cavity‐photon lifetime and the resonant bandwidth, omni‐resonance leads to the emergence of ”achromatic” resonances [ 18 ] that can help deliver coherently enhanced broadband absorption.…”

Section: Introductionmentioning

confidence: 99%

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Doubling the Near‐Infrared Photocurrent in a Solar Cell via Omni‐Resonant Coherent Perfect Absorption

Villinger

Shiri

Shabahang

et al. 2021

Advanced Optical Materials

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Minimizing the material usage in thin‐film solar cells can reduce manufacturing costs and enable mechanically flexible implementations, but concomitantly diminishes optical absorption. Coherent optical effects can help alleviate this inevitable drawback at discrete frequencies. For example, coherent perfect absorption guarantees that light is fully absorbed in a thin layer regardless of material or thickness—but only on resonance. Here, it is shown that “omni‐resonance” delivers such coherent enhancement over a broad bandwidth by structuring the optical field to nullify the angular dispersion intrinsic to resonant structures. After embedding an amorphous‐silicon thin‐film photovoltaic cell in a planar cavity, pre‐conditioning the incident light using an alignment‐free optical arrangement severs the link between the resonant bandwidth and the cavity‐photon lifetime, thereby rendering the cavity omni‐resonant. Coherently enhanced near‐infrared absorption doubles the photocurrent over the targeted spectral range 660–740 nm where every wavelength resonates. These results may pave the way to transparent solar cells that optimally harvest near‐infrared light.

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“…The key to harnessing the resonantly enhanced optical absorption associated with CPA over a broad, continuous bandwidth -rather than only at discrete resonant wavelengths -is the notion of omniresonance [49][50][51][52][53], which is illustrated in Fig. 1.…”

Section: Concept Of Omni-resonancementioning

confidence: 99%

Broadband Omni-resonant Coherent Perfect Absorption in Graphene

Jahromi,

Villinger,

Halawany

et al. 2021

Preprint

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Coherent perfect absorption (CPA) refers to interferometrically induced complete absorption of incident light by a partial absorber independently of its intrinsic absorption (which may be vanishingly small) or its thickness. CPA is typically realized in a resonant device, and thus cannot be achieved over a broad continuous spectrum, which thwarts its applicability to photodetectors and solar cells, for example. Here, we demonstrate broadband omni-resonant CPA by placing a thin weak absorber in a planar cavity and pre-conditioning the incident optical field by introducing judicious angular dispersion. We make use of monolayer graphene embedded in silica as the absorber and boost its optical absorption from ≈ 1.6% to ∼ 60% over a bandwidth of ∼ 70 nm in the visible. Crucially, an analytical model demonstrates that placement of the graphene monolayer at a peak in the cavity standing-wave field is not necessary to achieve CPA, contrary to conventional wisdom.

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Toggling between active and passive imaging with an omni-resonant micro-cavity

Cited by 14 publications

References 29 publications

Omni-resonant space–time wave packets

Omni-resonant space–time wave packets

Doubling the Near‐Infrared Photocurrent in a Solar Cell via Omni‐Resonant Coherent Perfect Absorption

Broadband Omni-resonant Coherent Perfect Absorption in Graphene

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