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ApplicationofSnell’sLawonOpticalCloakingBy: MIDN 4/C Peralta, 4/C Lockhart, 4/C Caron
ABSTRACT
Continueanexperimentwhichusesopticalspatialcloakingtohideanobjectbehindtwoseparatecontainersofwater.
BACKGROUND
OpticalSpatialCloakingisbasedontheideathatlightistransverselyshiftedthroughatiltedmediumandthenrefractedbacktodisplayaseparateimagefromtheonebeinghidden.
FollowingSnell’slaw:n1sin(θ1)=n2sin(θ2)Thecloakingwidth(2*d)canbeincreasedbyincreasingn2.
ACKNOWLEDGEMENTS
METHODS
Twoequalcontainersofwaterfilledwithequalvolumesofwaterwereused,alongwithalaserlightsource,andanobjectwhichwasusedtoshowthe‘cloakingregion’.
Thecloakingregionwascreatedbytheindexofrefractionofthematerialinsidethecontainers.Thematerialusedinthefirsttrail(Trial1)waswaterwhichhasanindexofrefractionofapproximately1.33.
Thesecondandthirdtrialwasusinga30%and80%solutionofsugar-waterrespectivelyinordertochangetheindexofrefraction.
Measurementsonthemaximumcloakingwidthwastakenbysplittingabeamoncorneroftheapparatusandmeasuringtheseperationbetweentheresultingbeams.
CONCLUSION
Thefutureofthisprojectliesintryingtomaximizethecloakedareawhileminimizingthesizeofthecloakingapparatus.Thiscanbedonebyfindingamaterialfortheappartuswithahigherindexofrefraction,orbyalteringtheangleoftheapparatustocreatealongerpath.
REFERENCES
J.C.Howell,J.B.Howell,andJ.S.Choi,“Amplitude-only,passive,broadband,opticalspatialcloakingofverylargeobjects,”AppliedOptics,(2014).
RESULTS
Lightwasdiffractedtoshowimagebehindthesecondcontainer.
Themaximumcloakingdistancewasapproximately10.75centimetersacrossusingapurewatersolutionof1.33indexofrefraction,11cmand11.5cmwithsubsequentadditionsofcupsofsugartodemonstratehowchangingtheindexofrefractionincreasesthecloakingwidththroughtheapplicationofSnell’slaw.