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Related Concept Videos

Design Example01:23

Design Example

The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
Cascaded Op Amps01:16

Cascaded Op Amps

Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
Fluid Mosaic Model01:34

Fluid Mosaic Model

The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.LipidsThe most...
Fluid Mosaic Model01:19

Fluid Mosaic Model

Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich with the analogy of...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...

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Characterization of Anisotropic Leaky Mode Modulators for Holovideo
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Published on: March 19, 2016

Full-range, continuous, complex modulation by the use of two coupled-mode liquid-crystal televisions.

L G Neto, D Roberge, Y Sheng

    Applied Optics
    |November 25, 2010
    PubMed
    Summary

    This study demonstrates switchable, continuous complex-amplitude modulation using two liquid-crystal televisions (LCTVs). A look-up table method compensates for coupling and nonlinearity, enabling optical hologram generation.

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    Published on: February 27, 2019

    Area of Science:

    • Optics and Photonics
    • Liquid Crystal Displays
    • Holography

    Background:

    • Complex-amplitude modulation is crucial for advanced optical applications.
    • Liquid-crystal televisions (LCTVs) offer a programmable platform for optical modulation.
    • Phase-amplitude coupling and nonlinearity in LCTVs limit modulation capabilities.

    Purpose of the Study:

    • To demonstrate switchable, continuous complex-amplitude modulation using cascaded LCTVs.
    • To develop a method for compensating LCTV nonlinearities and coupling effects.
    • To enable the generation of optical complex-amplitude Fresnel holograms.

    Main Methods:

    • Utilizing two cascaded twisted nematic liquid-crystal televisions (LCTVs) operating in coupled modes.
    • Implementing a look-up table encoding method to compensate for device nonlinearities.
    • Developing experimental techniques for LCTV parameter determination and modulation optimization.

    Main Results:

    • Achieved switchable, continuous complex-amplitude modulation over a full range.
    • Successfully compensated for phase-amplitude coupling and nonlinearity in LCTVs.
    • Demonstrated the generation of optical complex-amplitude Fresnel holograms.

    Conclusions:

    • Cascaded LCTVs can achieve full-range complex-amplitude modulation with proper compensation.
    • The proposed look-up table method effectively addresses LCTV limitations.
    • This technique provides a versatile platform for dynamic holographic applications.