Angular Sensitivity of Lens-Photoreceptor Systems

1975 ◽  
pp. 159-166 ◽  
Author(s):  
Colin Pask ◽  
Allan W. Snyder
Keyword(s):  
Angular Sensitivity

Angular Sensitivity Steering in CNT Electromagnetic Wave Detector

2017 ◽  
Vol 16 ◽  
pp. 1405-1408 ◽  
Author(s):  
Tatsuya Nobunaga ◽  
Yukihiro Tadokoro ◽  
Yutaka Ohno ◽  
Hiroya Tanaka
Keyword(s):  
Electromagnetic Wave ◽  
Angular Sensitivity ◽  
Wave Detector

scholarly journals Angular sensitivity of blowfly photoreceptors: broadening by artificial electrical coupling

1987 ◽  
Vol 160 (4) ◽  
pp. 501-507 ◽  
Author(s):  
J. G. J. Smakman ◽  
D. G. Stavenga
Keyword(s):  
Electrical Coupling ◽  
Angular Sensitivity

Diurnal changes in retinula cell sensitivities and receptive fields (two-dimensional angular sensitivity functions) in the apposition eyes of Ligia exotica (Crustacea, Isopoda)

2001 ◽  
Vol 204 (2) ◽  
pp. 239-248 ◽  
Author(s):  
T. Hariyama ◽  
V.B. Meyer-Rochow ◽  
T. Kawauchi ◽  
Y. Takaku ◽  
Y. Tsukahara
Keyword(s):  
Receptive Fields ◽  
Resolving Power ◽  
Pigment Cells ◽  
Diurnal Changes ◽  
Two Dimensional ◽  
Angular Sensitivity ◽  
Pigment Granules ◽  
Screening Pigment ◽  
The Difference ◽  
Night And Day

The structural organization of the retinula cells in the eye of Ligia exotica changes diurnally. At night, the microvilli elongate, losing the regular and parallel alignment characteristic of the day condition. Crystalline cones and distal rhabdom tips are not pushed into each other during the day, but at night the rhabdoms protrude into the crystalline cones by up to 5 microm. Screening pigment granules in the retinula cells disperse during the night, but migrate radially towards the vicinity of the rhabdom during the day. No such displacements of the pigment granules of either distal or proximal screening pigment cells were observed. The sensitivity of the eye, monitored by electroretinogram (ERG) recordings, changes diurnally: values at midnight are, on average, 10 times those occurring during the day. However, intracellular recordings from single retinula cells (50 during the day and 50 at night) indicate that the difference between night and day sensitivities is only 2.5-fold. Two-dimensional angular sensitivity curves, indicative of a single unit's spatial sensitivity, had considerably less regular outlines at night than during the day. If based on the 50 % sensitivity level, day and night eyes possessed receptive fields of almost identical width (approximately 2 degrees), but if sensitivities below the 50 % limit were included, then receptive fields at night were significantly more extensive. We suggest that the morphological adaptations and diurnal changes in chromophore content seen in the apposition eye of L. exotica allow this animal to improve its photon capture at night while preserving at least some of the spatial resolving power characteristic of the light-adapted state. This would explain why this animal is capable of performing complex escape behaviours in the presence of predators both in bright and in very dim light.

Changes of Acuity during Light and Dark Adaptation in the Dragonfly Compound Eye

1990 ◽  
Vol 45 (1-2) ◽  
pp. 137-142 ◽  
Author(s):  
Eric J. Warrant ◽  
Robert B. Pinter
Keyword(s):  
Dark Adaptation ◽  
Time Course ◽  
Light Adaptation ◽  
Compound Eye ◽  
Sensitivity Function ◽  
The State ◽  
Intracellular Recordings ◽  
Acceptance Angle ◽  
Angular Sensitivity ◽  
Rapid Reduction

Abstract Intracellular recordings of angular sensitivity from the photoreceptors of Aeschnid dragonflies (Hemianax papuensis and Aeschna brevistyla) are used to determine the magnitude and time course of acuity changes following alterations of the state of light or dark adaptation. Acuity is defined on the basis of the acceptance angle, Δρ (the half-width of the angular-sensitivity function). The maximally light-adapted value of Δρ is half the dark-adapted value, indicating greater acuity during light adaptation. Following a change from light to dark adaptation, Δρ increases slowly, requiring at least 3 min to reach its dark-adapted value. In contrast, the reverse change (dark to light) induces a rapid reduction of Δρ , and at maximal adapting luminances, this reduction takes place in less than 10 sec.

Angular Sensitivity of Neutron-Induced Single-Event Upsets in 12-nm FinFET SRAMs With Comparison to 20-nm Planar SRAMs

2020 ◽  
Vol 67 (7) ◽  
pp. 1485-1493
Author(s):  
Takashi Kato ◽  
Masanori Hashimoto ◽  
Hideya Matsuyama
Keyword(s):  
Single Event ◽  
Angular Sensitivity ◽  
Single Event Upsets ◽  
20 Nm

scholarly journals Phenomenon of Electromagnetic Field Resonance in Metal and Dielectric Gratings and Its Possible Practical Applications

2020 ◽  
Vol 5 (3) ◽  
pp. 49
Author(s):  
Stefano Bellucci ◽  
Andrii Bendziak ◽  
Oleksandr Vernyhor ◽  
Volodymyr M. Fitio
Keyword(s):  
Refractive Index ◽  
Buffer Layer ◽  
Propagation Constant ◽  
Refractive Index Change ◽  
Dielectric Substrate ◽  
Angular Sensitivity ◽  
Practical Applications ◽  
Dielectric Gratings ◽  
Constant Change ◽  
Dielectric Grating

Calculations of the field distribution in the structure of the dielectric substrate/buffer layer/volume phase grating/analyzed medium were performed. It is shown that in the presence of a buffer layer with a low refractive index in the dielectric waveguide leads to a shift of the maximum field at the waveguide resonance into analyzed medium. As a result, the spectral and angular sensitivity of the corresponding sensor increases. Based on the waveguide equation, analytical expressions are obtained that connect the spectral and angular sensitivity of the sensor to the sensitivity of the propagation constant change due to the refractive index change of the analyzed medium. The conditions for the excitation of the resonance of surface plasmon–polariton waves in the structure with a metal or dielectric grating on a metal substrate are also given. The fields that occur at resonance for silver and gold gratings are calculated.

Enhancing angular sensitivity of plasmonic nanostructures using mode transition in hexagonal gold nanohole arrays

2017 ◽  
Vol 241 ◽  
pp. 800-805 ◽  
Author(s):  
En-Hung Lin ◽  
Wan-Shao Tsai ◽  
Kuang-Li Lee ◽  
Ming-Chang M. Lee ◽  
Pei-Kuen Wei
Keyword(s):  
Plasmonic Nanostructures ◽  
Mode Transition ◽  
Angular Sensitivity ◽  
Nanohole Arrays

Angular Sensitivity of VHF-Band CNT Antenna

2015 ◽  
Vol 14 (6) ◽  
pp. 1112-1116 ◽  
Author(s):  
Hiroya Tanaka ◽  
Yutaka Ohno ◽  
Yukihiro Tadokoro
Keyword(s):  
Angular Sensitivity
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