Remote Biodetection Method Using Circular Dichroism

1993 ◽  
Vol 47 (11) ◽  
pp. 1887-1891 ◽  
Author(s):  
David L. Rosen
Keyword(s):  
Circular Dichroism ◽  
Circular Polarization ◽  
Laser Light ◽  
New Method ◽  
Optical Elements ◽  
Biological Aerosols ◽  
Optical Table ◽  
Circular Dichroïsm ◽  
Aerosol Plume

This paper proposes a new method for remote biodetection and simulates it with a laboratory optical table experiment. The new method, called circular polarization transmissometry, uses laser light scattered from the ground to measure the circular dichroism in an aerosol plume. In the optical table experiment, a scatter plate simulated the ground, and solutions of camphoroquinone simulated the biological aerosols. The experiment showed that this biodetection method could work even in daylight. Optical elements with inherent birefringence caused an optical artifact background that was subtracted from the signal.

scholarly journals Circular Dichroism in the Photoionization of Unpolarized Atoms by Two Crossing Photon Beams

Atoms ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 108
Author(s):  
Alexei V. Meremianin ◽  
Nikolai L. Manakov
Keyword(s):  
Circular Dichroism ◽  
Electric Field ◽  
Circular Polarization ◽  
Experimental Observation ◽  
Phase Difference ◽  
Polarization Degree ◽  
Angular Distributions ◽  
Photon Beams ◽  
Large Magnitude ◽  
Circular Dichroïsm

The polarization dependence of the photoionization probability was analyzed in the case when a randomly oriented atom is irradiated by two crossing polarized monochromatic photon beams with the same frequency. It was found that the angular distributions of photoelectrons exhibit the effect of circular dichroism (CD), which consists of the dependence of the photoionization probability on the sign of the circular polarization degree of each beam. We demonstrate that the CD effect exists only for coherent crossing photon beams. It was shown that CD effects are strongly dependent on the phase difference between the electric field vectors of the photon beams and have a quite large magnitude. The possibilities of the experimental observation of CD effects are discussed.

scholarly journals Circular Dichroism and Circular Polarization of Photoluminescence of Highly Ordered Poly{3,4-di[(S)-2-methylbutoxy]thiophene}

1996 ◽  
Vol 118 (20) ◽  
pp. 4908-4909 ◽  
Author(s):  
B. M. W. Langeveld-Voss ◽  
R. A. J. Janssen ◽  
M. P. T. Christiaans ◽  
S. C. J. Meskers ◽  
H. P. J. M. Dekkers ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Circular Polarization ◽  
Circular Dichroïsm

Narrowband terahertz metasurface circular polarization beam splitter with large spectral tunability based on lattice-induced chirality

2021 ◽  
Author(s):  
Xiaoqing Luo ◽  
Xiaoxiang Dong ◽  
Xinlong Xu ◽  
Fangrong Hu ◽  
Guangyuan Li
Keyword(s):  
Circular Dichroism ◽  
Circular Polarization ◽  
Beam Splitter ◽  
Incidence Angle ◽  
Extinction Ratio ◽  
Polarization Beam Splitter ◽  
Dual Band ◽  
Quality Factors ◽  
Surface Lattice ◽  
Circular Dichroïsm

Abstract We propose a terahertz metasurface with chirality induced by surface lattice resonance for achieving narrowband circular polarization beam splitter (PBS) with large spectral tunability in both transmission and reflection modes. Results show that strong circular dichroism effects can be observed in two spectrally narrow bands, and thus a dual-band circular PBS can be achieved. We show that surface lattice resonance induces much narrower and stronger circular dichroism effects than localized resonance, resulting in higher polarization extinction ratios, higher quality factors, and more circular polarization states. The narrowband operation frequency of lattice-induced PBS with extinction ratio larger than 10 dB can be tuned over a large spectral range, from 1.6 THz to 2.3 THz, by varying the incidence angle. We expect the proposed strong, narrowband, and spectrally tunable circular PBS will find applications in polarization-dependent systems including imaging, spectroscopy, sensing and telecommunication in the terahertz regime.

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