Circularly Polarized Stimulated Emission from a Chiral Cavity Based on Apparent Circular Dichroism Organic Thin Films

Li Zhi Lin; Ling Qi Huang; Shi Wei You; Yi Jan Huang; Francesco Zinna; Andrew Salij; Lorenzo Di Bari; Randall H. Goldsmith; Roel Tempelaar; Chia Yen Huang; Tzu Ling Chen

doi:10.1021/acsphotonics.4c02560

Circularly Polarized Stimulated Emission from a Chiral Cavity Based on Apparent Circular Dichroism Organic Thin Films

Li Zhi Lin, Ling Qi Huang, Shi Wei You, Yi Jan Huang, Francesco Zinna, Andrew Salij, Lorenzo Di Bari, Randall H. Goldsmith, Roel Tempelaar, Chia Yen Huang, Tzu Ling Chen^*

^*Corresponding author for this work

Chemistry

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

1 Scopus citations

Abstract

The lack of intrinsic mirror symmetry in cavity mirrors poses a significant challenge for most organic chiral materials in generating circularly polarized (CP) lasers. However, nonreciprocal chiroptical materials, such as recently developed organic thin films exhibiting apparent circular dichroism (ACD), provide a promising approach to CP light generation. In this work, we integrate an ACD-based thin film into a free-space dye laser cavity, achieving direct CP laser emission with a degree of circular polarization (DOCP) up to 0.6, corresponding to a dissymmetry factor (g_lum) of 1.2, a new record for organic chiral lasers. The degree of polarization (DOP) is close to 0.8, and the observed ellipticity in the emitted light originates from the ACD effect in the thin film, leading to asymmetric cavity losses for right- and left-circularly polarized light. This breakthrough demonstrates the potential of ACD-based materials to overcome the limitations of conventional chiral laser systems, marking a significant advancement in the field and paving the way for next-generation chiral photonic devices.

Original language	English (US)
Pages (from-to)	2557-2565
Number of pages	9
Journal	ACS Photonics
Volume	12
Issue number	5
DOIs	https://doi.org/10.1021/acsphotonics.4c02560
State	Published - May 21 2025

Funding

This work was supported by grants NSTC111-2628-M-A49-009, NSTC112-2628-M-A49-002, NSTC113-2628-M-A49-002, as well as by the Ministry of Education in Taiwan under the Yushan Young Scholar Program. A.S., R.T., R.H.G. acknowledge support from the Center for Molecular Quantum Transduction, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under Award DE-SC0021314. L.D.B. and F.Z. acknowledge support from the Ministero dell\u2019Universita\u0300e della Ricerca, Italy, under grant PRIN20172M3K5N.

Keywords

apparent circular dichroism (ACD)
chiral laser
circular polarization
degree of circular polarization
dissymmetry factor
dye laser
organic thin films
stimulated emission

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Biotechnology
Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering

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10.1021/acsphotonics.4c02560

Cite this

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title = "Circularly Polarized Stimulated Emission from a Chiral Cavity Based on Apparent Circular Dichroism Organic Thin Films",

abstract = "The lack of intrinsic mirror symmetry in cavity mirrors poses a significant challenge for most organic chiral materials in generating circularly polarized (CP) lasers. However, nonreciprocal chiroptical materials, such as recently developed organic thin films exhibiting apparent circular dichroism (ACD), provide a promising approach to CP light generation. In this work, we integrate an ACD-based thin film into a free-space dye laser cavity, achieving direct CP laser emission with a degree of circular polarization (DOCP) up to 0.6, corresponding to a dissymmetry factor (glum) of 1.2, a new record for organic chiral lasers. The degree of polarization (DOP) is close to 0.8, and the observed ellipticity in the emitted light originates from the ACD effect in the thin film, leading to asymmetric cavity losses for right- and left-circularly polarized light. This breakthrough demonstrates the potential of ACD-based materials to overcome the limitations of conventional chiral laser systems, marking a significant advancement in the field and paving the way for next-generation chiral photonic devices.",

keywords = "apparent circular dichroism (ACD), chiral laser, circular polarization, degree of circular polarization, dissymmetry factor, dye laser, organic thin films, stimulated emission",

author = "Lin, {Li Zhi} and Huang, {Ling Qi} and You, {Shi Wei} and Huang, {Yi Jan} and Francesco Zinna and Andrew Salij and {Di Bari}, Lorenzo and Goldsmith, {Randall H.} and Roel Tempelaar and Huang, {Chia Yen} and Chen, {Tzu Ling}",

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AU - Lin, Li Zhi

AU - Huang, Ling Qi

AU - You, Shi Wei

AU - Huang, Yi Jan

AU - Zinna, Francesco

AU - Salij, Andrew

AU - Di Bari, Lorenzo

AU - Goldsmith, Randall H.

AU - Tempelaar, Roel

AU - Huang, Chia Yen

AU - Chen, Tzu Ling

PY - 2025/5/21

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N2 - The lack of intrinsic mirror symmetry in cavity mirrors poses a significant challenge for most organic chiral materials in generating circularly polarized (CP) lasers. However, nonreciprocal chiroptical materials, such as recently developed organic thin films exhibiting apparent circular dichroism (ACD), provide a promising approach to CP light generation. In this work, we integrate an ACD-based thin film into a free-space dye laser cavity, achieving direct CP laser emission with a degree of circular polarization (DOCP) up to 0.6, corresponding to a dissymmetry factor (glum) of 1.2, a new record for organic chiral lasers. The degree of polarization (DOP) is close to 0.8, and the observed ellipticity in the emitted light originates from the ACD effect in the thin film, leading to asymmetric cavity losses for right- and left-circularly polarized light. This breakthrough demonstrates the potential of ACD-based materials to overcome the limitations of conventional chiral laser systems, marking a significant advancement in the field and paving the way for next-generation chiral photonic devices.

AB - The lack of intrinsic mirror symmetry in cavity mirrors poses a significant challenge for most organic chiral materials in generating circularly polarized (CP) lasers. However, nonreciprocal chiroptical materials, such as recently developed organic thin films exhibiting apparent circular dichroism (ACD), provide a promising approach to CP light generation. In this work, we integrate an ACD-based thin film into a free-space dye laser cavity, achieving direct CP laser emission with a degree of circular polarization (DOCP) up to 0.6, corresponding to a dissymmetry factor (glum) of 1.2, a new record for organic chiral lasers. The degree of polarization (DOP) is close to 0.8, and the observed ellipticity in the emitted light originates from the ACD effect in the thin film, leading to asymmetric cavity losses for right- and left-circularly polarized light. This breakthrough demonstrates the potential of ACD-based materials to overcome the limitations of conventional chiral laser systems, marking a significant advancement in the field and paving the way for next-generation chiral photonic devices.

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Circularly Polarized Stimulated Emission from a Chiral Cavity Based on Apparent Circular Dichroism Organic Thin Films

Abstract

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Keywords

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