Optical properties of drug metabolites in latent fingermarks

Abstract

Drug metabolites usually have structures of split-ring resonators (SRRs), which might lead to negative permittivity and permeability in electromagnetic field. As a result, in the UV-vis region, the latent fingermarks images of drug addicts and non drug users are inverse. The optical properties of latent fingermarks are quite different between drug addicts and non-drug users. This is a technic superiority for crime scene investigation to distinguish them. In this paper, we calculate the permittivity and permeability of drug metabolites using tight-binding model. The latent fingermarks of smokers and non-smokers are given as an example.

Broad-band negative refraction via simultaneous multi-electron transitions

“… m if is the transition magnetic dipole between the initial state ñ |i and the final state ñ | f ,  H is the applied magnetic field. Under the dipole approximation, according to linear-response theory [53], the relative permittivity and permeability are given by [9,17,[22][23][24][25]30]  å e e w g = -…”

“…Metamaterials with negative refraction [1][2][3][4][5][6][7] have attracted broad interest because of their potential applications, including perfect lenses [2,8], fingerprint identification in forensic science [9], simulating condensed matter phenomena and reversed Doppler effect [10,11], controlling light polarization [12], and electromagnetic cloaking [13][14][15]. In order to realize metamaterials, a number of routes have been proposed, including (molecular) split-ring resonators [3,16,17], chiral approaches [18], hyperbolic dispersion [19][20][21][22], dark-state mechanism [23][24][25][26][27], and topological routes [28][29][30].…”

Negative refraction in Möbius molecules

“…Negative refractive index materials are very promising, e.g., in achieving the electromagnetic field cloaking [3,4], facilitating the sub-wavelength imaging [5], and crime scene investigation [6]. However, such materials do not naturally exist for the absence of magnetic response at the same frequency as electric response.…”

Hyperbolic metamaterial using chiral molecules

“…Since it was theoretically proposed in 1968 [1], negative refraction has attracted broad interest because there is wide application for negative-index metamaterials [2][3][4][5][6][7][8][9][10][11][12], such as achieving electromagnetic-field cloaking [13,14], facilitating sub-wavelength imaging [2], and assisting crime scene investigation [15]. Various ways have been proposed to realize negative refraction.…”