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Atomically Thin Spatial Light Modula...

Li, Melissa,

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Atomically Thin Spatial Light Modulators with Excitonic Nanomaterials /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Atomically Thin Spatial Light Modulators with Excitonic Nanomaterials // Melissa Li.
Author:	Li, Melissa,
Description:	1 electronic resource (124 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-10, Section: B.
Contained By:	Dissertations Abstracts International86-10B.
Subject:	Gold. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31954659
ISBN:	9798311931472

Atomically Thin Spatial Light Modulators with Excitonic Nanomaterials /
Li, Melissa,

Atomically Thin Spatial Light Modulators with Excitonic Nanomaterials /Melissa Li. - 1 electronic resource (124 pages)

Source: Dissertations Abstracts International, Volume: 86-10, Section: B.

Achieving active control of light at the ultimate thickness limit-a single atomic layer-offers unprecedented opportunities for next-generation optoelectronic devices. The quest for ultrathin spatial light modulators has long relied on integrating tunable materials with plasmonic or high-index nanoantennas that serve as small, but three-dimensional optical resonators. As structures for controlling light become increasingly complex and compact, the geometrical constraints of these three-dimensional resonators will ultimately limit their scalability and versatility. A new avenue for device miniaturization emerges when harnessing electrically tunable resonances that are intrinsic to atomically thin materials.This thesis explores how exciton resonances, specifically in two-dimensional (2D) van der Waals materials, can serve as the central building blocks for future spatial light modulators that are as thin as atoms. We start by characterizing the gate-tunable optical properties of a monolayer molybdenum diselenide (MoSe₂), a 2D transition metal dichalcogenide. By tuning the exciton resonances with voltage, we demonstrate over 200% modulation in the real and imaginary part of the complex refractive index. We attribute this large tunability to the interplay between radiative and nonradiative decay channels of the excitons. The index modulation gives rise to amplitude and phase modulation of the scattered light, which is then used to engineer an electrically tunable phase gradient across a single monolayer MoSe₂ flake to dynamically steer the reflected beam.Next, we present a theoretical analysis of the complex frequency response of a generalized excitonic heterostructure. We show how the spectral positions of the phase singularities, e.g. zeros and poles, can be dynamically controlled, their impacts on the real frequency phase response, and how they can be used in active metasurface design. Finally, we evaluate excitons in quantum dots as an alternative platform for room temperature optical modulators and show how they present different challenges in designing phase modulators.Overall, our work highlights the novel functionalities enabled by exciton resonances for advanced light manipulation, underscoring their potential for atomically thin light modulators.

English

ISBN: 9798311931472Subjects--Topical Terms:

659820
Gold.

Atomically Thin Spatial Light Modulators with Excitonic Nanomaterials /
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245 1 0 $a Atomically Thin Spatial Light Modulators with Excitonic Nanomaterials / $c Melissa Li.
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500 $a Source: Dissertations Abstracts International, Volume: 86-10, Section: B.
500 $a Advisors: Atwater, Harry Albert Committee members: Nadj-Perge, Stevan; Vahala, Kerry J; Scherer, Axel.
502 $b Ph.D. $c California Institute of Technology $d 2025.
520 $a Achieving active control of light at the ultimate thickness limit-a single atomic layer-offers unprecedented opportunities for next-generation optoelectronic devices. The quest for ultrathin spatial light modulators has long relied on integrating tunable materials with plasmonic or high-index nanoantennas that serve as small, but three-dimensional optical resonators. As structures for controlling light become increasingly complex and compact, the geometrical constraints of these three-dimensional resonators will ultimately limit their scalability and versatility. A new avenue for device miniaturization emerges when harnessing electrically tunable resonances that are intrinsic to atomically thin materials.This thesis explores how exciton resonances, specifically in two-dimensional (2D) van der Waals materials, can serve as the central building blocks for future spatial light modulators that are as thin as atoms. We start by characterizing the gate-tunable optical properties of a monolayer molybdenum diselenide (MoSe₂), a 2D transition metal dichalcogenide. By tuning the exciton resonances with voltage, we demonstrate over 200% modulation in the real and imaginary part of the complex refractive index. We attribute this large tunability to the interplay between radiative and nonradiative decay channels of the excitons. The index modulation gives rise to amplitude and phase modulation of the scattered light, which is then used to engineer an electrically tunable phase gradient across a single monolayer MoSe₂ flake to dynamically steer the reflected beam.Next, we present a theoretical analysis of the complex frequency response of a generalized excitonic heterostructure. We show how the spectral positions of the phase singularities, e.g. zeros and poles, can be dynamically controlled, their impacts on the real frequency phase response, and how they can be used in active metasurface design. Finally, we evaluate excitons in quantum dots as an alternative platform for room temperature optical modulators and show how they present different challenges in designing phase modulators.Overall, our work highlights the novel functionalities enabled by exciton resonances for advanced light manipulation, underscoring their potential for atomically thin light modulators.
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650 4 $a Optical properties. $3 3560260
650 4 $a Photonics. $3 526247
650 4 $a Energy. $3 876794
650 4 $a Graphene. $3 1569149
650 4 $a Aperture. $3 3682378
650 4 $a Quantum dots. $3 604799
650 4 $a Optics. $3 517925
650 4 $a Radiation. $3 673904
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710 2 $a California Institute of Technology. $b Engineering and Applied Science. $e degree granting institution. $3 3765818
720 1 $a Atwater, Harry Albert $e degree supervisor.
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