High-Q Emission from Colloidal Quantum Dots Embedded in Polymer Quasi-BIC Metasurfaces

Sachin P. Kulkarni; Akhilesh Kumar Pathak; Sridhar Krishnaswamy; Koray Aydin

doi:10.1021/acs.nanolett.4c05817

High-Q Emission from Colloidal Quantum Dots Embedded in Polymer Quasi-BIC Metasurfaces

Sachin P. Kulkarni, Akhilesh Kumar Pathak, Sridhar Krishnaswamy, Koray Aydin^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

Metasurfaces supporting narrowband resonances are of significant interest in photonics for molecular sensing, quantum light source engineering, and nonlinear photonics. However, many device architectures rely on large refractive index dielectric materials and lengthy fabrication processes. In this work, we demonstrate quasi-bound states in the continuum (quasi-BICs) using a polymer metasurface exhibiting experimental quality factors of 305 at visible wavelengths. Our fabrication process only consists of electron-beam lithography and resist development, making it compatible with large-scale fabrication techniques. Additionally, we address the challenges of integrating colloidal quantum dots (CQDs) into the nanopillars, such as depletion-induced aggregation and excess nanoparticle removal, by leveraging our previously reported nanoparticle functionalization method and modified development procedures. We demonstrate both narrowband and polarized emission from our CQD-integrated quasi-BIC metasurfaces. Our proposed metasurface platform is broadly applicable across various quantum emitters and fabrication methods and could enable advancements in scalable manufacturing of resonant optical devices.

Original language	English (US)
Pages (from-to)	1653-1659
Number of pages	7
Journal	Nano letters
Volume	25
Issue number	4
DOIs	https://doi.org/10.1021/acs.nanolett.4c05817
State	Published - Jan 29 2025

Funding

We thank Dr. Serkan Butun for his advice and assistance with sample fabrication. K.A. acknowledges support from the Air Force Office of Scientific Research under award number FA9550-22-1-0300 and partial support from the Northwestern University Office of Provost Covid Research Recovery Grant. S.K. acknowledges support from the Office of Naval Research through award numbers N00014-23-1-2529 and N00014-21-1-2233. This research was supported in part through the computational resources and staff contributions provided for the Quest high performance computing facility at Northwestern University which is jointly supported by the Office of the Provost, the Office for Research, and Northwestern University Information Technology. This work made use of the EPIC and NUFAB facilities of Northwestern University\u2019s NUANCE Center, which has received support from the SHyNE Resource (NSF ECCS-2025633), the IIN, and Northwestern\u2019s MRSEC program (NSF DMR-2308691).

Keywords

Electron beam lithography
Fluorescence
Metasurfaces
Polymers
Quantum dots
Quasi-BIC

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1021/acs.nanolett.4c05817

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title = "High-Q Emission from Colloidal Quantum Dots Embedded in Polymer Quasi-BIC Metasurfaces",

abstract = "Metasurfaces supporting narrowband resonances are of significant interest in photonics for molecular sensing, quantum light source engineering, and nonlinear photonics. However, many device architectures rely on large refractive index dielectric materials and lengthy fabrication processes. In this work, we demonstrate quasi-bound states in the continuum (quasi-BICs) using a polymer metasurface exhibiting experimental quality factors of 305 at visible wavelengths. Our fabrication process only consists of electron-beam lithography and resist development, making it compatible with large-scale fabrication techniques. Additionally, we address the challenges of integrating colloidal quantum dots (CQDs) into the nanopillars, such as depletion-induced aggregation and excess nanoparticle removal, by leveraging our previously reported nanoparticle functionalization method and modified development procedures. We demonstrate both narrowband and polarized emission from our CQD-integrated quasi-BIC metasurfaces. Our proposed metasurface platform is broadly applicable across various quantum emitters and fabrication methods and could enable advancements in scalable manufacturing of resonant optical devices.",

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author = "Kulkarni, {Sachin P.} and Pathak, {Akhilesh Kumar} and Sridhar Krishnaswamy and Koray Aydin",

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AU - Krishnaswamy, Sridhar

AU - Aydin, Koray

PY - 2025/1/29

Y1 - 2025/1/29

N2 - Metasurfaces supporting narrowband resonances are of significant interest in photonics for molecular sensing, quantum light source engineering, and nonlinear photonics. However, many device architectures rely on large refractive index dielectric materials and lengthy fabrication processes. In this work, we demonstrate quasi-bound states in the continuum (quasi-BICs) using a polymer metasurface exhibiting experimental quality factors of 305 at visible wavelengths. Our fabrication process only consists of electron-beam lithography and resist development, making it compatible with large-scale fabrication techniques. Additionally, we address the challenges of integrating colloidal quantum dots (CQDs) into the nanopillars, such as depletion-induced aggregation and excess nanoparticle removal, by leveraging our previously reported nanoparticle functionalization method and modified development procedures. We demonstrate both narrowband and polarized emission from our CQD-integrated quasi-BIC metasurfaces. Our proposed metasurface platform is broadly applicable across various quantum emitters and fabrication methods and could enable advancements in scalable manufacturing of resonant optical devices.

AB - Metasurfaces supporting narrowband resonances are of significant interest in photonics for molecular sensing, quantum light source engineering, and nonlinear photonics. However, many device architectures rely on large refractive index dielectric materials and lengthy fabrication processes. In this work, we demonstrate quasi-bound states in the continuum (quasi-BICs) using a polymer metasurface exhibiting experimental quality factors of 305 at visible wavelengths. Our fabrication process only consists of electron-beam lithography and resist development, making it compatible with large-scale fabrication techniques. Additionally, we address the challenges of integrating colloidal quantum dots (CQDs) into the nanopillars, such as depletion-induced aggregation and excess nanoparticle removal, by leveraging our previously reported nanoparticle functionalization method and modified development procedures. We demonstrate both narrowband and polarized emission from our CQD-integrated quasi-BIC metasurfaces. Our proposed metasurface platform is broadly applicable across various quantum emitters and fabrication methods and could enable advancements in scalable manufacturing of resonant optical devices.

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High-Q Emission from Colloidal Quantum Dots Embedded in Polymer Quasi-BIC Metasurfaces

Abstract

Funding

Keywords

ASJC Scopus subject areas

UN SDGs

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