公开(公告)号：US09709440B2

公开(公告)日：2017-07-18

申请号：US14325502

申请日：2014-07-08

Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY

Inventor： Dirk Robert Englund ,  Edward H. Chen ,  Fan Meng ,  Tim Schroder ,  Noel Heng Loon Wang ,  Ren-Jye Shiue

IPC: G01J3/02 ,  G01J3/453 ,  G02B6/42 ,  G02B6/293

CPC classification number: G01J3/0205 ,  G01J3/0218 ,  G01J3/0256 ,  G01J3/453 ,  G02B6/29344 ,  G02B6/4287

Abstract: Multimode interference can be used to achieve ultra-high resolving powers (e.g., Q>105) with linewidths down to 10 pm at 1500 nm and a broad spectroscopy range (e.g., 400-2400 nm) within a monolithic, millimeter-scale device. For instance, multimode interference (MMI) in a tapered waveguide enables fine resolution and broadband spectroscopy in a compact, monolithic device. The operating range is limited by the transparency of the waveguide material and the sensitivity of the camera; thus, the technique can be easily extended into the ultraviolet and mid- and deep-infrared spectrum. Experiments show that a tapered fiber multimode interference spectrometer can operate across a range from 500 nm to 1600 nm (B=1.0576) without moving parts. The technique is suitable for on-chip tapered multimode waveguides, which could be fabricated in high volume by printing or optical lithography, for applications from biochemical sensing to the life and physical sciences.