Patent ID: 9329224
Filing Date: 2016-05-03
CPC Classification: G01R,H01L,H02S,Y02E

Claim Text:
1. A method, comprising: accepting a sample, wherein said sample comprises quantum wells sandwiched in-between two semiconductor layers, wherein said sample has an optical property, and has a parameter of interest; creating a strain pulse inside said sample by directing a pump light pulse onto said sample and selecting the wavelength of said pump light pulse in such manner that said quantum wells absorb said pump light pulse whereby generating electron/hole pairs in said quantum wells, wherein said quantum wells are piezoelectric whereby said strain pulse is responsive to an electric field created by said electron/hole pairs, and wherein said optical property is responsive to said strain pulse; measuring a signal using a probe light pulse, wherein said probe light pulse is directed onto said sample with a time delay in relation to said pump light pulse, and said probe light pulse is responsive to said optical property, wherein said signal derives from a change in said optical property as function of said time delay, wherein said signal has an amplitude, an said amplitude is responsive to said electric field; and deriving said parameter of interest from a characteristic of said amplitude.