( ( ( The ( working principle ) ) ( is ( ( ( that ( ( a ( metallic coil ) ) ( is ( placed ( on ( ( the ( moving MEMS ) ) ( mirror itself ) ) ) ) ) ) ) and ) ( as ( ( the mirror ) ( is ( placed ( in ( a ( magnetic field ) ) ) ) ) ) ) ) ) ) ( , ( ( ( the ( alternative ( current flowing ) ) ) ( in ( the coil ) ) ) ( ( generate ( ( Lorentz force ) ( that ( tilts ( the mirror ) ) ) ) ) . ) ) ) )
(ROOT (S (S (NP (DT The) (VBG working) (NN principle)) (VP (VBZ is) (SBAR (SBAR (IN that) (S (NP (DT a) (JJ metallic) (NN coil)) (VP (VBZ is) (VP (VBN placed) (PP (IN on) (NP (NP (DT the) (VBG moving) (NNS MEMS)) (VP (VBP mirror) (NP (PRP itself))))))))) (CC and) (SBAR (IN as) (S (NP (DT the) (NN mirror)) (VP (VBZ is) (VP (VBN placed) (PP (IN in) (NP (DT a) (JJ magnetic) (NN field)))))))))) (, ,) (NP (NP (DT the) (JJ alternative) (JJ current) (NN flowing)) (PP (IN in) (NP (DT the) (NN coil)))) (VP (VBP generate) (NP (NP (NNP Lorentz) (NN force)) (SBAR (WHNP (WDT that)) (S (VP (VBZ tilts) (NP (DT the) (NN mirror))))))) (. .)))
The working principle is that a metallic coil is placed on the moving MEMS mirror itself and as the mirror is placed in a magnetic field, the alternative current flowing in the coil generate Lorentz force that tilts the mirror.
(ROOT (S (NP (NNP Alternative) (JJ current)) (VP (VBZ is) (VP (VBN produced) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN magnet) (CC or) (NN coil)) (VP (VBZ moves) (ADVP (RB back) (CC and) (RB forth)) (ADVP (RB repeatedly))))))) (. .)))