2D Silver-Nanoplatelets Metasurface for Bright Directional Photoluminescence, Designed with the Local Kirchhoff’s Law

Bailly, Elise; Hugonin, Jean-Paul; Coudevylle, Jean-René; Dabard, Corentin; Ithurria, Sandrine; Vest, Benjamin; Greffet, Jean-Jacques

doi:10.1021/acsnano.3c09874

Cited by 5 publications

References 63 publications

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Shaping the Infrared luminescence of Colloidal Nanocrystals Using a Dielectric Microcavity

Bossavit,

Zhang,

Ledos

et al. 2024

Adv Funct Materials

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As they have gained maturity, colloidal nanocrystals (NCs) have also expand the spectral range over of which they could be used for photonic and optoelectronic applications. In particular, the infrared use of NCs has become of utmost interest to develop cost‐effective alternatives to current technologies. It is then critical not to let the material dictate the light–matter interaction, which is why the coupling of NCs to photonic cavities has been proposed. For infrared NCs, this approach has first been devoted to the control of absorption with in mind the increase of the signal magnitude for detectors. A Lot of efforts have been focused on the use of metallic metasurfaces. However, these generate significant optical losses and yield low quality factor. Here, this study rather focus on the coupling of infrared NCs to a dielectric mirror cavity. HgTe/CdS core‐shell NCs are used and integrated into a cavity made of aperiodic dielectric mirrors. The effect of the substrate is systematically study on spectral linewidth, carrier dynamic, and emission directivity. The cavity is shown to narrow the PL by a factor 10, while focusing the emission over a 12° angle. Monitoring the power dependence of the emission, this study shows that the cavity leads to 250 K increase in the effective electronic temperature.

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Shaping the Infrared luminescence of Colloidal Nanocrystals Using a Dielectric Microcavity

Bossavit,

Zhang,

Ledos

et al. 2024

Adv Funct Materials

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Optimizing Polarization Selective Unidirectional Photoluminescence from Phased‐Array Metasurfaces

Heki,

Mohtashami,

Chao

et al. 2024

Advanced Optical Materials

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Metasurface‐based optical elements offer a wide design space for miniature and lightweight optical applications. Typically, metasurface optical elements transform an incident light beam into a desired output waveform. Recent demonstrations of light‐emitting metasurfaces highlight the potential for directly producing desired output waveforms via metasurface‐mediated spontaneous emission. In this work, reciprocal finite‐difference time‐domain (FDTD) simulations and machine learning are used to enable the inverse design of highly unidirectional photoluminescent III‐Nitride quantum well metasurfaces capable of directive p‐, s‐, or combined p‐ and s‐ polarized emission at arbitrary angles. In comparison with previous intuition‐guided designs using the same quantum well architectures, the inverse design approach enables new polarization capabilities and experimentally demonstrated improvements in directivity of 54%. An analysis of ways in which the inverse design both validates and contradicts previous intuition‐guided design heuristics is presented. Ultimately, the combination of reciprocal simulations and efficient global optimization (EGO) grants remarkable improvements in emission directivity and results in full control over the polarization and momentum of emitted light, including simultaneous directional emission of s‐ and p‐polarized light.

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Advancing the Coupling of III–V Quantum Dots to Photonic Structures to Shape Their Emission Diagram

Bossavit,

Yeromina,

Mastrippolito

et al. 2024

Advanced Optical Materials

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The development of optoelectronic devices based on III–V semiconductor colloidal quantum dots (CQDs) is highly sought after due to their reduced toxicity. While devices based on conventional CQDs (II–VI semiconductors, halide perovskites) have achieved impressive technological leaps since their discovery, the most mature of these compounds contain toxic heavy metal elements (Cd, Hg, or Pb), which are highly undesirable for safe industrial scale applications. The strong covalent bonds of III–V compounds like InP, InAs, or InSb prevent the release of their toxic atoms, making them safer. However, these same bonds create severe material constraints. Namely, their harsher reaction conditions and increased sensitivity to oxidation have kept most of the research focused on material development. Meanwhile, their integration into devices and their coupling to photonic structures lag behind. Here, the integration of InAs/ZnSe core‐shell CQDs is advanced. First, the material parameters necessary to design plasmonic gratings coupled to the CQDs are elucidated and those gratings are fabricated. Angle‐resolved spectroscopy shows that the plasmon modes successfully couple to the CQD layer's emission leading to a tunable directivity with a 15° linewidth. A 3‐fold increase of the PL signal is achieved at normal incidence, thus advancing toward the goal of efficient outcoupling in LEDs.

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2D Silver-Nanoplatelets Metasurface for Bright Directional Photoluminescence, Designed with the Local Kirchhoff’s Law

Cited by 5 publications

References 63 publications

Shaping the Infrared luminescence of Colloidal Nanocrystals Using a Dielectric Microcavity

Shaping the Infrared luminescence of Colloidal Nanocrystals Using a Dielectric Microcavity

Optimizing Polarization Selective Unidirectional Photoluminescence from Phased‐Array Metasurfaces

Advancing the Coupling of III–V Quantum Dots to Photonic Structures to Shape Their Emission Diagram

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