Photonics Dictionary: T

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tetartohedral crystal

The section of crystal symmetry having only one-quarter of the greatest number of faces permitted by the crystal system of which the section is a member.

twin crystal

A compound crystal having two or more crystals or crystal sections that, when regularly positioned, are in reverse position relative to the other sections. When viewed, these crystals appear to be...

tetragonal

With respect to crystals, having three mutually rectangular axes, only two of which are equal.

thin-film semiconductor

A semiconductor formed by applying a particular single-crystal layer to the specific insulator.

Ti:sapphire laser

A Ti:sapphire laser is a type of solid-state laser that utilizes a titanium-doped sapphire crystal as the gain medium. The name Ti:sapphire comes from the combination of titanium (Ti) as the dopant...

TN-LCD

twisted nematic liquid crystal display

topological photonics

Topological photonics is a branch of physics and optics that explores the application of topological concepts to the behavior of light in photonic systems. Drawing inspiration from the field of...

tourmaline

A naturally occurring crystalline mineral that has the property of polarizing transmitted light. It is little used now that the Polaroid sheet is available.

transmission electron microscope

A transmission electron microscope (TEM) is a powerful microscopy technique that uses a beam of electrons to create high-resolution images of extremely thin samples. In a TEM, electrons are...

triboluminescence

Luminescence that arises from friction and that usually occurs in crystalline materials.

triclinic

With respect to a crystal, having three unequal axes intersecting at angles, only two of which can be equal and only one of which can measure 90°.

twinning

A defect of natural quartz crystals in which both the right and left quartz are in the same crystal.

twist -> deformation constant

Any of the constants that relate the tendency of the director to remain parallel to restoring torques throughout the media. The three constants of importance in liquid crystal displays are: splay --...

twisted nematic phase

A form of liquid crystal widely used in displays, achieved by sandwiching a liquid crystal material between two substrates whose inside surfaces have been prepared with a special coating that aligns...

Photonics DictionaryT

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