Chiral light in single-handed Fabry-Perot resonators

Abstract Chirality is a universal phenomenon that is encountered on many different length scales in nature. Interaction of chiral matter with chiral light results in the effect of circular dichroism, which underlies many techniques of discriminating molecular enantiomers. Enhancing dichroic effects is typically achieved by interfacing chiral matter with various optical resonators. In this context it is important to understand how the eigenmodes of optical cavities relate to the field states with well-defined handedness. Here, we present the model of a single-handedness chiral optical cavity supporting only an eigenmode of a given handedness without the presence of modes of other helicity. Resonant excitation of the cavity with light of appropriate handedness enables formation of a helical standing wave with a uniform chirality density, while the opposite handedness does not cause any resonant effects. Our findings expand the set of tools for investigations of chiral matter and open the door towards studies of chiral electromagnetic vacuum states.

Download Full-text

Circular dichroism mode splitting and bounds to its enhancement with cavity-plasmon-polaritons

Nanophotonics ◽

10.1515/nanoph-2019-0372 ◽

2020 ◽

Vol 9 (2) ◽

pp. 283-293 ◽

Cited By ~ 4

Author(s):

Denis G. Baranov ◽

Battulga Munkhbat ◽

Nils Odebo Länk ◽

Ruggero Verre ◽

Mikael Käll ◽

...

Keyword(s):

Circular Dichroism ◽

Coupled System ◽

Plasmonic Nanoparticles ◽

Strong Coupling Regime ◽

Optical Cavities ◽

Mode Splitting ◽

Fabry Perot ◽

Theoretical Predictions ◽

Light Matter Interaction ◽

Circular Dichroïsm

AbstractGeometrical chirality is a widespread phenomenon that has fundamental implications for discriminating enantiomers of biomolecules. In order to enhance the chiral response of the medium, it has been suggested to couple chiral molecules to resonant optical cavities in order to enhance the circular dichroism (CD) signal at the resonant frequency of the cavity. Here, we studied a distinctly different regime of chiral light-matter interaction, wherein the CD signal of a chiral medium splits into polaritonic modes by reaching the strong coupling regime with an optical microcavity. Specifically, we show that by strongly coupling chiral plasmonic nanoparticles to a non-chiral Fabry-Pérot microcavity one can imprint the mode splitting on the CD spectrum of the coupled system and thereby effectively shift the initial chiral resonance to a different energy. We first examined the effect with the use of analytical transfer-matrix method as well as numerical finite-difference time-domain (FDTD) simulations. Furthermore, we confirmed the validity of theoretical predictions in a proof-of-principle experiment involving chiral plasmonic nanoparticles coupled to a Fabry-Pérot microcavity.

Download Full-text

Polariton Ring Currents and Circular Dichroism of Mg-porphyrin in a Chiral Cavity

Chemical Science ◽

10.1039/d1sc04341b ◽

2022 ◽

Author(s):

Shichao Sun ◽

Bing Gu ◽

S. Mukamel

Keyword(s):

Circular Dichroism ◽

Time Reversal ◽

Optical Cavity ◽

Polarized Light ◽

Time Reversal Symmetry ◽

Porphyrin Molecule ◽

Ring Currents ◽

Linearly Polarized ◽

Circular Dichroïsm

By placing a Mg-porphyrin molecule in a chiral optical cavity, time reversal symmetry is broken, thus generating polariton ring currents even with linearly polarized light. These currents induce a circular...

Download Full-text

Induced dichroism in fiber optical resonators with an embedded optically active element

Computer Optics ◽

10.18287/2412-6179-co-750 ◽

2021 ◽

Vol 45 (2) ◽

pp. 200-207

Author(s):

C.N. Alexeyev ◽

E.V. Barshak ◽

D.V. Vikulin ◽

B.P. Lapin ◽

M.A. Yavorsrky

Keyword(s):

Circular Dichroism ◽

Optical Activity ◽

Fundamental Mode ◽

Active Element ◽

Optical Resonators ◽

Optically Active ◽

Fiber Optical ◽

Loop Ring ◽

Circular Dichroïsm

In this paper we have demonstrated the emergence of an effective circular dichroism for the fundamental mode in fiber resonators of loop and ring types with an optically active element embedded into the loop/ring. Changing the parameters of the resonator, the optically active element, or the wavelength of the incoming field allows one to control the value of the effective dichroism and actually, to increase optical activity of the element. It is shown that these resonators can be used as working elements of all-fiber polarizers for the fundamental mode.

Download Full-text

MAGNETIC CIRCULAR DICHROISM OF 4d–4f RESONANT X-RAY EMISSION FOR GADOLINIUM AND TERBIUM

Surface Review and Letters ◽

10.1142/s0218625x02003020 ◽

2002 ◽

Vol 09 (02) ◽

pp. 837-841 ◽

Cited By ~ 2

Author(s):

YASUHIRO TAKAYAMA ◽

HIDEO OHTSUBO ◽

MOTOKI SHINODA ◽

KENJI OBU ◽

CHOL LEE ◽

...

Keyword(s):

Circular Dichroism ◽

Excitation Energy ◽

Surface State ◽

Magnetic Moment ◽

Magnetic Circular Dichroism ◽

Emission Spectra ◽

Resonant Excitation ◽

X Ray ◽

Excitation Region ◽

Circular Dichroïsm

We have measured the magnetic circular dichroism (MCD) of X-ray emission spectra (XES) for gadolinium and terbium in the 4d–4f resonant excitation region. Clear MCD signals in the XES were observed and they dramatically changed as the excitation energy changed. Especially, an extremely large MCD signal appeared with the 8D resonant excitation for gadolinium. Comparison between the MCD for XES and total photoelectron yield (TEY) shows that the XES are very insensitive to the surface state. As a result, the measurement of XES was proved to be a superior technique for estimating the genuine magnetic moment in the bulk.

Download Full-text

Characterization of Tamm-Horsfall Urinary Glycoprotein

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010007254x ◽

1973 ◽

Vol 31 ◽

pp. 420-421

Author(s):

John P. Robinson ◽

J. David Puett

Keyword(s):

Electron Microscopy ◽

Circular Dichroism ◽

Secondary Structure ◽

Quaternary Structure ◽

Normal Adult ◽

Morphological Properties ◽

Adult Males ◽

Circular Dichroïsm ◽

Urinary Glycoprotein

Much work has been reported on the chemical, physical and morphological properties of urinary Tamm-Horsfall glycoprotein (THG). Although it was once reported that cystic fibrotic (CF) individuals had a defective THG, more recent data indicate that THG and CF-THG are similar if not identical.No studies on the conformational aspects have been reported on this glycoprotein using circular dichroism (CD). We examined the secondary structure of THG and derivatives under various conditions and have correlated these results with quaternary structure using electron microscopy.THG was prepared from normal adult males and CF-THG from a 16-year old CF female by the method of Tamm and Horsfall. CF female by the method of Tamm and Horsfall.

Download Full-text