scholarly journals Circular Polarization Vision in a Stomatopod Crustacean

2008 ◽  
Vol 18 (6) ◽  
pp. 429-434 ◽  
Author(s):  
Tsyr-Huei Chiou ◽  
Sonja Kleinlogel ◽  
Tom Cronin ◽  
Roy Caldwell ◽  
Birte Loeffler ◽  
...  
Keyword(s):  
Circular Polarization ◽  
Polarization Vision

Circular Polarization Vision of Scarab Beetles

2014 ◽  
pp. 147-170 ◽  
Author(s):  
Gábor Horváth ◽  
Miklós Blahó ◽  
Ádám Egri ◽  
Ramón Hegedüs ◽  
Győző Szél
Keyword(s):  
Circular Polarization ◽  
Polarization Vision ◽  
Scarab Beetles

scholarly journals Filtering and polychromatic vision in mantis shrimps: themes in visible and ultraviolet vision

2014 ◽  
Vol 369 (1636) ◽  
pp. 20130032 ◽  
Author(s):  
Thomas W. Cronin ◽  
Michael J. Bok ◽  
N. Justin Marshall ◽  
Roy L. Caldwell
Keyword(s):  
Circular Polarization ◽  
Spectral Range ◽  
Colour Vision ◽  
Spatial Vision ◽  
Polarization Vision ◽  
Optical Elements ◽  
Retinal Photoreceptors ◽  
Functional Classes ◽  
Ultraviolet Vision ◽  
Visible Wavelengths

Stomatopod crustaceans have the most complex and diverse assortment of retinal photoreceptors of any animals, with 16 functional classes. The receptor classes are subdivided into sets responsible for ultraviolet vision, spatial vision, colour vision and polarization vision. Many of these receptor classes are spectrally tuned by filtering pigments located in photoreceptors or overlying optical elements. At visible wavelengths, carotenoproteins or similar substances are packed into vesicles used either as serial, intrarhabdomal filters or lateral filters. A single retina may contain a diversity of these filtering pigments paired with specific photoreceptors, and the pigments used vary between and within species both taxonomically and ecologically. Ultraviolet-filtering pigments in the crystalline cones serve to tune ultraviolet vision in these animals as well, and some ultraviolet receptors themselves act as birefringent filters to enable circular polarization vision. Stomatopods have reached an evolutionary extreme in their use of filter mechanisms to tune photoreception to habitat and behaviour, allowing them to extend the spectral range of their vision both deeper into the ultraviolet and further into the red.

scholarly journals Neural processing of linearly and circularly polarized light signal in a mantis shrimp Haptosquilla pulchella

2020 ◽  
Vol 223 (22) ◽  
pp. jeb219832
Author(s):  
Tsyr-Huei Chiou ◽  
Ching-Wen Wang
Keyword(s):  
Circular Polarization ◽  
Linear Polarization ◽  
Polarized Light ◽  
Polarization Vision ◽  
Animal Group ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Mantis Shrimp ◽  
Linearly Polarized ◽  
Vector Angle

ABSTRACTStomatopods, or mantis shrimp, are the only animal group known to possess circular polarization vision along with linear polarization vision. By using the rhabdomere of a distally located photoreceptor as a wave retarder, the eyes of mantis shrimp are able to convert circularly polarized light into linearly polarized light. As a result, their circular polarization vision is based on the linearly polarized light-sensitive photoreceptors commonly found in many arthropods. To investigate how linearly and circularly polarized light signals might be processed, we presented a dynamic polarized light stimulus while recording from photoreceptors or lamina neurons in intact mantis shrimp Haptosquilla pulchella. The results indicate that all the circularly polarized light-sensitive photoreceptors also showed differential responses to the changing e-vector angle of linearly polarized light. When stimulated with linearly polarized light of varying e-vector angle, most photoreceptors produced a concordant sinusoidal response. In contrast, some lamina neurons doubled the response frequency in reacting to linearly polarized light. These responses resembled a rectified sum of two-channel linear polarization-sensitive photoreceptors, indicating that polarization visual signals are processed at or before the first optic lobe. Noticeably, within the lamina, there was one type of neuron that showed a steady depolarization response to all stimuli except right-handed circularly polarized light. Together, our findings suggest that, between the photoreceptors and lamina neurons, linearly and circularly polarized light may be processed in parallel and differently from one another.

HOW THE MEDIAN S-BAND CIRCULAR POLARIZATION RATIO OF KILOMETER-SCALE CRATERS EVOLVES WITH TIME ON THE LUNAR MARIA

2018 ◽  
Author(s):  
Caleb I. Fassett ◽  
◽  
Isabel R. King ◽  
Cole A. Nypaver ◽  
Bradley J. Thomson
Keyword(s):  
Circular Polarization ◽  
Polarization Ratio ◽  
Lunar Maria

A Broadband Circularly Polarized Cross-slotted Patch Antenna with Horizontal Meandered Strip (HMS)

Frequenz ◽  
2020 ◽  
Vol 74 (5-6) ◽  
pp. 191-199
Author(s):  
M. K. Verma ◽  
Binod K. Kanaujia ◽  
J. P. Saini ◽  
Padam S. Saini
Keyword(s):  
Circular Polarization ◽  
Patch Antenna ◽  
Impedance Matching ◽  
Axial Ratio ◽  
Impedance Bandwidth ◽  
Radiation Patterns ◽  
Circularly Polarized ◽  
Feeding Technique

AbstractA broadband circularly polarized slotted square patch antenna with horizontal meandered strip (HMS) is presented and studied. The HMS feeding technique provides the good impedance matching and broadside symmetrical radiation patterns. A set of cross asymmetrical slots are etched on the radiating patch to realize the circular polarization. An electrically small stub is added on the edge of the antenna for further improvement in performance. Measured 10-dB impedance bandwidth (IBW) and 3-dB axial ratio bandwidth (ARBW) of the proposed antenna are 32.31 % (3.14–4.35 GHz) and 20.91 % (3.34–4.12 GHz), respectively. The gain of the antenna is varied from 3.5 to 4.86dBi within 3-dB ARBW. Measured results matched well with the simulated results.

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