Device and method for the temperature-independent operation of electro-optical switches on the basis of ferroelectric liquid crystals having a deformed helix
First Claim
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1. An optical liquid crystal modulator comprising:
- at least one ferroelectric liquid crystal, wherein the at least one ferroelectric liquid crystal has a DHF mode and, at a location of the at least one ferroelectric liquid crystal, exhibits an operating range of an electric field of more than 20 V/μ
m, wherein at a temperature of about 20.0°
C., a helical pitch Po is between about 0.1 to about 0.5 μ
m.
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Abstract
In order to substantially reduce temperature-dependent influences and attendant long switching times in the case of an optical liquid crystal modulator having at least one ferroelectric liquid crystal and in a method for operating an optical liquid crystal modulator, the ferroelectric liquid crystals are provided to have a DHF mode and to exhibit an operating range of an electric field of more than 20 V/μm at the location of the liquid crystal.
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Citations
4 Claims
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1. An optical liquid crystal modulator comprising:
at least one ferroelectric liquid crystal, wherein the at least one ferroelectric liquid crystal has a DHF mode and, at a location of the at least one ferroelectric liquid crystal, exhibits an operating range of an electric field of more than 20 V/μ
m, wherein at a temperature of about 20.0°
C., a helical pitch Po is between about 0.1 to about 0.5 μ
m.
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2. An optical liquid crystal modulator comprising:
at least one ferroelectric liquid crystal, wherein the at least one ferroelectric liquid crystal has a DHF mode and, at a location of the at least one ferroelectric liquid crystal, exhibits an operating range of an electric field of more than 20 V/μ
m, wherein at a temperature of about 20.0°
C., a helical pitch Po is about 0.22 μ
m.
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3. A method for operating an optical liquid crystal modulator having a ferroelectric liquid crystal, comprising:
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operating the optical liquid crystal modulator at a location of the ferroelectric liquid crystal in an operating range of an electric field of greater than 20 V/μ
m,wherein the ferroelectric liquid crystal has a DHF mode and wherein the ferroelectric liquid crystal has a helical pitch Po of about 0.1 to 0.5 at a temperature of about 20.0°
C.
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4. A method for operating an optical liquid crystal modulator having a ferroelectric liquid crystal, comprising:
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operating the optical liquid crystal modulator at a location of the ferroelectric liquid crystal in an operating range of an electric field of greater than 20 V/μ
m,wherein the ferroelectric liquid crystal has a DHF mode and wherein the ferroelectric liquid crystal has a helical pitch Po of about 0.22 μ
m at a temperature of about 20.0°
C.
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Specification
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Current AssigneeDeutsche Telekom AG
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Original AssigneeDeutsche Telekom AG
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InventorsHaase, Wolfgang, Pozhidaev, Eugene, Ganzke, Dirk, Dultz, Wolfgang
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Primary Examiner(s)Eckert, George
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Assistant Examiner(s)Warren, Matthew E.
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Application NumberUS09/830,757Time in Patent Office1,741 DaysField of Search349/100, 349/133, 349/172, 349/181US Class Current349/172CPC Class CodesG02F 1/141 using ferroelectric liquid ...G02F 1/1414 Deformed helix ferroelectri...
