Wideband-rejection filters and reflection-hole filters of chalcogenide glass for circularly polarized IR-A and IR-B radiation

Pulsifer, Drew P.; Martin-Palma, Ra Ul J.; Swiontek, Stephen E.; Pantano, Carlo G.; Lakhtakia, Akhlesh

doi:10.1364/ome.1.001332

Cited by 9 publications

(8 citation statements)

References 29 publications

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“…3, an arrow showing the location of the defect. The measured spectrums of its four circular transmittances T RR;LL;LR;RL are provided; 27 here, T LR is the intensity of the transmitted LCP plane wave when the incident plane wave is RCP. Most notably, a spike centered at 1445-nm wavelength in the spectrum of T RR confirms that this chiral STF functions as a reflection-hole filter for incident RCP light in the NIR regime, but not for incident LCP light.…”

Section: Resultsmentioning

confidence: 99%

“…In order to endow the chiral STF with a central 90 deg-twist defect, the two-step cycle was repeated 960 times, the substrate was quickly rotated a quarter turn about its central normal axis, and another set of 960 two-step cycles was then implemented. 27 The second glass substrate was first spin coated with approximately 30-nm-thick UV-sensitive polymer ROLIC ROP-103, baked at a temperature of 80°C for 30 min, and then baked again for 1 h at 230°C. After cooling, this structure was irradiated with linearly polarized UV light to produce planar alignment of the LC molecules, as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…19 The phase defect can be of many types. 18,[22][23][24][25][26] Pulsifer et al 27 recently fabricated a chiral STF with a central 90 deg-twist defect for operation in the NIR regime. The structure was made by evaporating chalcogenide glass.…”

Section: Introductionmentioning

confidence: 99%

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On alignment of nematic liquid crystals infiltrating chiral sculptured thin films

et al. 2013

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A structurally right-handed chiral sculptured thin film (STF) with a central 90 degtwist defect was made by thermal evaporation of chalcogenide glass and the use of a serial bideposition process to exhibit a narrowband hole in the spectrum of the right-circularly polarized light reflected when right-circularly polarized light is normally incident on the chiral STF. In an attempt to build a tunable filter, the chiral STF was then infiltrated with a highly birefringent nematic liquid crystal (LC), which caused a linear reflectance peak to redshift by ∼350 nm. But the circular Bragg phenomenon exhibited by the uninfiltrated chiral STF was greatly diminished owing to the similarity in the constitutive properties of the LC and the chalcogenide glass. No temperature dependence of the shifted peak was observed, which provided clear evidence that the LC molecules are not ordered inside the chiral STF but are randomly aligned instead.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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On alignment of nematic liquid crystals infiltrating chiral sculptured thin films

et al. 2013

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“…See Ref. 27 Fig. 2(a), in order to impose some orientational order in the void regions of the chiral STF, in view of experience with porous silicon [10].…”

Section: Methodsmentioning

confidence: 99%

“…The phase defect can be of many types [18,[22][23][24][25][26]. Pulsifer et al [27] recently fabricated a chiral STF with a central 90º-twist defect for operation in the NIR regime. The structure was made by evaporating chalcogenide glass.…”

Section: Introductionmentioning

confidence: 99%

On alignment of nematic liquid crystals infiltrating chiral sculptured thin films

et al. 2012

Self Cite

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A structurally right-handed chiral sculptured thin film (STF) with a central 90º-twist defect was made by thermal evaporation of chalcogenide glass and the use of a serial bi-deposition process to exhibit a narrowband hole in the spectrum of the right-circularly polarized light reflected when right-circularly polarized light is normally incident on the chiral STF. The chiral STF was then infiltrated with a highly birefringent nematic liquid crystal (LC), which caused a linear reflectance peak to redshift by ~350 nm, but the circular Bragg phenomenon exhibited by the uninfiltrated chiral STF was greatly diminished owing to the similarity in the constitutive properties of the LC and the chalcogenide glass. No temperature dependence of the shifted peak was observed, which provided clear evidence that the LC molecules are not ordered inside the chiral STF but are randomly aligned instead.

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Dushkina

Lakhtakia

2013

Engineered Biomimicry

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Wideband-rejection filters and reflection-hole filters of chalcogenide glass for circularly polarized IR-A and IR-B radiation

Cited by 9 publications

References 29 publications

On alignment of nematic liquid crystals infiltrating chiral sculptured thin films

On alignment of nematic liquid crystals infiltrating chiral sculptured thin films

On alignment of nematic liquid crystals infiltrating chiral sculptured thin films

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