Reflective imaging device and image acquisition method

摘要

In order to generate a two-dimensional image of a sample in a short time using THz waves, provided is a reflective imaging device including a sample holder, a THz wave light source, a THz wave camera, a rotation mechanism for rotating the holder and the camera, and a processing unit. A sample unit includes an incidence member, a sample, and a reflection member. The sample includes a first region of only a membrane and a second region including a biopolymer. The camera detects, with regard to respective incident angles, a THz wave in which interference occurs between a component reflected at an interface between the incidence member and the sample and a component reflected at an interface between the sample and the reflection member, of each portion of the sample unit, and outputs a signal. The processing unit specifies an incident angle at which a signal of a first THz wave that interferes in the first region is relatively small and a signal of a second THz that interferes in the second region is relatively large, and generates a two-dimensional image of the sample based on the signal from the camera with regard to the specified incident angle.

主权项

1. A reflective imaging device, comprising:
a light source for generating a terahertz wave; a holder for holding a sample unit; an optical system for causing the terahertz wave from the light source to enter an entire surface of the sample unit; a camera including a two-dimensional array sensor for detecting the terahertz wave reflected by the sample unit; a rotation mechanism for rotating the holder to change, in a predetermined angle range, an incident angle of the terahertz wave which enters the sample unit and for rotating the camera so that the terahertz wave reflected by the sample unit is collected to the camera; and a processing unit for processing a signal output from the camera, wherein: the sample unit comprises, from an incident side of the terahertz wave:
an incidence member which transmits the terahertz wave;a sample; anda reflection member which reflects a terahertz wave; the sample comprises:
a first region of only a membrane having a predetermined refractive index; anda second region including a target substance in the membrane, the target substance having a refractive index which is different from the predetermined refractive index of the membrane; the camera detects a terahertz wave in which interference occurs between a component reflected at an interface between the incidence member and the sample of the sample unit and a component reflected at an interface between the sample and the reflection member of the sample unit, with regard to respective incident angles in the predetermined angle range, and outputs a signal in accordance with a strength of the detected terahertz wave; and the processing unit specifies an incident angle at which a signal of a first terahertz wave that interferes in the first region is relatively small and a signal of a second terahertz wave that interferes in the second region is relatively large, and generates a two-dimensional image of the sample based on the signal output by the camera after the detection with regard to the specified incident angle.