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Mixed liquid crystal material having high double-refractivity within terahertz frequency band

A large birefringence, terahertz technology, used in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of high operating voltage, slow device response speed, modulation amount and transmittance decrease, etc., to achieve low viscosity, low working The effect of voltage

Active Publication Date: 2013-01-16
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the liquid crystal layer is too thick, the arrangement of the liquid crystal molecules will be uneven, and the modulation amount and transmittance will decrease; and because the response speed of the liquid crystal device is inversely proportional to the square of the thickness, the response speed of the device will be too slow, and the thick cell will also lead to an excessively high operating voltage. , ultimately unable to play a role in actual signal detection and modulation

Method used

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  • Mixed liquid crystal material having high double-refractivity within terahertz frequency band
  • Mixed liquid crystal material having high double-refractivity within terahertz frequency band
  • Mixed liquid crystal material having high double-refractivity within terahertz frequency band

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The thickness of the quartz used is 700 μm, the nominal value of the thickness of the polyester film is 125 μm, and the measured value of the high-resolution spectrometer is 126.8 μm, and a parallel orientation empty box is made.

[0022] The mixed crystal material consists of 76% a component (a1: R1=C 2 h 5 , R2=C 3 h 7 10%; a2: R1=C 4 h 9 , R2=C 3 h 7 10%; a3: R1=C 3 h 7 , R2=C 2 h 5 10%; a4: R1=C 3 h 7 , R2=C 4 h 9 10%; a5: R1=C 2 h 5 , R2=OC 5 h 11 8%; a6: R1=C 3 h 7 , R2=OC 5 h 11 8%; a7: R1=C 3 h 7 , R2=OC 4 h 9 6%; a8: R1=C 2 h 5 , R2=OC 2 h 5 6%; a9: R1=C 3 h 7 , R2=OC 2 h 5 6%; a10: R1=C 3 h 7 , R2=OCH 3 2%), 12% b component (b1: R1=C 3 h 7 6%; b2: R1=C 5 h 11 6%), 5% c component (all R1=C 4 h 9 , R2=OC 2 h 5 ) and 7% of the d component (d1: R1 = C 3 h 7 , R2=C 2 h 5 4%; d2: R1=C 3 h 7 , R2=OCH 3 Accounting for 3%) melt mixing formation.

[0023] The physical properties of the actual test liquid crystal are as...

Embodiment 2

[0025] The thickness of the quartz used is 700 μm, the nominal value of the thickness of the polyester film is 125 μm, and the measured value of the high-resolution spectrometer is 126.8 μm, and a parallel orientation empty box is made.

[0026] The mixed crystal material consists of 81% a component (a1: R1=C 2 h 5 , R2=C 3 h 7 10%; a2: R1=C 4 h 9 , R2=C 3 h 7 10%; a3: R1=C 3 h 7 , R2=C 2 h 5 10%; a4: R1=C 3 h 7 , R2=C 4 h 9 10%; a5: R1=C 2 h 5 , R2=OC 5 h 11 10%; a6: R1=C 3 h 7 , R2=OC 5 h 11 10%; a7: R1=C 3 h 7 , R2=OC 4 h 9 7%; a8: R1=C 2 h 5 , R2=OC 2 h 5 6%; a9: R1=C 3 h 7 , R2=OC 2 h 5 6%; a10: R1=C 3 h 7 , R2=OCH 3 2%), 12% b component (b1: R1=C 3 h 7 6%; b2: R1=C 5 h 11 6%), 5% c component (all R1=C 4 h 9 , R2=OC 2 h 5 ) and 2% of the d component (all for R1=C 3 h 7 , R2=C 2 h 5 ) are formed by melt mixing.

[0027] The physical properties of the actual test liquid crystal are as follows: liquid crystal clearing point T ...

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Abstract

The invention provides a mixed liquid crystal material having high double-refractivity within terahertz frequency band. A series of derivatives R1-PPT (2.6-F)P-R2, accounting for 70-85% and having fluoro-diphenylacetylene skeleton structure, are used as a component a; a series of derivatives R1-P'(3-F)PP-F, accounting for 10-15% and having a fluoro-diphenyl pyridine skeleton structure, are used as a component b; a series of derivatives R1-PTP-R2, accounting for 2-10% and having a diphenylacerylene skeleton structure, are used as a component c; a series of derivatives R1-PT(2,6-F)P-R2, accounting for 2-10% and having a fluoro-diphenylacerylene skeleton structure, are used as a component d; and the components a, b, c and d are subjected to melt blending so as to form a mixed liquid crystal. The the mixed liquid crystal material has the maximum double-refractivity within the terahertz frequency band, has the advantages of wide-temperature liquid crystal phase (from -15 DEG C to 150 DEG C) and low viscosity, can be used for production of quick-response compact THz modulation devices with low working voltage, and is applicable to application fields of material sciences, biomedicines, nondestructive detection and the like in a wide scope.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal materials and terahertz information, and in particular relates to a liquid crystal mixed crystal material with large birefringence in the terahertz frequency band. Background technique [0002] Terahertz (THz) technology has shown broad application prospects in the fields of material science, biomedicine, non-destructive testing, national security and anti-terrorism. Related technologies and research have developed rapidly in recent years. The key to the application of THz technology is the effective detection or imaging of THz signals, and THz signal modulation components, such as high-quality phase shifters, signal switches and modulators, are indispensable in detection and imaging systems. Due to its excellent tuning characteristics of external fields (electric field, magnetic field, light field, sound field, temperature field, etc.), liquid crystals can be applied to tunable THz photoni...

Claims

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Application Information

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IPC IPC(8): C09K19/44
Inventor 胡伟王磊陆延青林晓雯徐飞
Owner NANJING UNIV
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